| 1. |
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Advanced Bioelectronic Materials
- 2015
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Editorial collection (other academic/artistic)abstract
- This book covers the recent advances in the development of bioelectronics systems and their potential application in future biomedical applications starting from system design to signal processing for physiological monitoring, to in situ biosensing.Advanced Bioelectronics Materialshas contributions from distinguished international scholars whose backgrounds mirror the multidisciplinary readership ranging from the biomedical sciences, biosensors and engineering communities with diverse backgrounds, interests and proficiency in academia and industry. The readers will benefit from the widespread coverage of the current literature, state-of-the-art overview of all facets of advanced bioelectronics materials ranging from real time monitoring, in situ diagnostics, in vivo imaging, image-guided therapeutics, biosensors, and translational biomedical devices and personalized monitoring.
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| 2. |
- Ali Kamyabi, Mohammad, et al.
(author)
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Correction: A high-performance glucose biosensor using covalently immobilised glucose oxidase on a poly(2,6-diaminopyridine)/carbon nanotube electrode (vol 116, pg 801, 2013)
- 2016
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In: Talanta. - : ELSEVIER SCIENCE BV. - 0039-9140 .- 1873-3573. ; 153, s. 414-415
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Journal article (peer-reviewed)abstract
- A highly-sensitive glucose biosensor amenable to ultraminiaturisation was fabricated by immobilization of glucose oxidase (wGOX), onto a poly(2,6-diaminopyridine)/multi-walled carbon nanotube/glassy carbon electrode (poly(2,6-DP)/MWCNT/GCE). Cyclic voltammetry was used for both the electrochemical synthesis of poly-(2,6-DP) on the surface of a MWCNT-modified GC electrode, and characterization of the polymers deposited on the GC electrode. The synergistic effect of the high active surface area of both the conducting-polymer, i.e., poly-(2,6-DP) and MWCNT gave rise to a remarkable improvement in the electrocatalytic properties of the biosensor. The transfer coefficient (alpha), heterogeneous electron transfer rate constant and Michaelis-Menten constant were calculated to be 0.6, 4 s-1 and 0.22 mM at pH 7.4, respectively. The GOx/poly(2,6-DP)/MWCNT/GC bioelectrode exhibited two linear responses to glucose in the concentration ranging from 0.42 mu M to 8.0 mM with a correlation coefficient of 0.95, sensitivity of 52.0 mu AmM-1 cm-2, repeatability of 1.6% and long-term stability, which could make it a promising bioelectrode for precise detection of glucose in the biological samples. (C) 2016 Elsevier B.V. All rights reserved.
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| 3. |
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| 4. |
- Ashaduzzaman, Md., et al.
(author)
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On/off-switchable LSPR nano-immunoassay for troponin-T
- 2017
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In: Scientific Reports. - : Springer Nature. - 2045-2322. ; 7:1
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Journal article (peer-reviewed)abstract
- Regeneration of immunosensors is a longstanding challenge. We have developed a re-usable troponin-T (TnT) immunoassay based on localised surface plasmon resonance (LSPR) at gold nanorods (GNR). Thermosensitive poly(N-isopropylacrylamide) (PNIPAAM) was functionalised with anti-TnT to control the affinity interaction with TnT. The LSPR was extremely sensitive to the dielectric constant of the surrounding medium as modulated by antigen binding after 20 min incubation at 37 degrees C. Computational modelling incorporating molecular docking, molecular dynamics and free energy calculations was used to elucidate the interactions between the various subsystems namely, IgG-antibody (c. f., anti-TnT), PNIPAAM and/or TnT. This study demonstrates a remarkable temperature dependent immuno-interaction due to changes in the PNIPAAM secondary structures, i.e., globular and coil, at above or below the lower critical solution temperature (LCST). A series of concentrations of TnT were measured by correlating the lambda(LSPR) shift with relative changes in extinction intensity at the distinct plasmonic maximum (i. e., 832 nm). The magnitude of the red shift in lambda(LSPR) was nearly linear with increasing concentration of TnT, over the range 7.6 x 10(-15) to 9.1 x 10(-4) g/mL. The LSPR based nano-immunoassay could be simply regenerated by switching the polymer conformation and creating a gradient of microenvironments between the two states with a modest change in temperature.
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| 5. |
- Ashaduzzaman, M., et al.
(author)
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Studies on an on/off-switchable immunosensor for troponin T
- 2015
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In: Biosensors & bioelectronics. - : Elsevier BV. - 0956-5663 .- 1873-4235. ; 73
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Journal article (peer-reviewed)abstract
- Regeneration is a key goal in the design of immunosensors. In this study, we report the temperature-regulated interaction of N-isopropylacrylamide (PNIPAAm) functionalised cardiac troponin T (cTnT) with anti-cTnT. Covalently bonded PNIPAAm on an anti-cTnT bioelectrode showed on/off-switchability, regeneration capacity and temperature triggered sensitivity for cTnT. Above the lower critical solution temperature (LCST), PNIPAAm provides a liphophilic microenvironment with specific volume reduction at the bioelectrode surface, making available binding space for cTnT, and facilitating analyte recognition. Computational studies provide details about the structural changes occurring at the electrode above and below the LCST. Furthermore, free energies associated with the binding of cTnT with PNIPAAm at 25 (δGcoil=-6.0Kcal/mole) and 37°C (δGglobular=-41.0kcal/mole) were calculated to elucidate the interaction and stability of the antigen-antibody complex. The responsiveness of such assemblies opens the way for miniaturised, smart immuno-technologies with 'built-in' programmable interactions of antigen-antibody upon receiving stimuli.
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| 6. |
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| 7. |
- Imani, Roghayeh, et al.
(author)
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Band edge engineering of TiO2@DNA nanohybrids and implications for capacitive energy storage devices.
- 2015
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In: Nanoscale. - : RSC Publishing. - 2040-3364 .- 2040-3372. ; 7:23, s. 10438-10448
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Journal article (peer-reviewed)abstract
- Novel mesoporous TiO2@DNA nanohybrid electrodes, combining covalently encoded DNA with mesoporous TiO2 microbeads using dopamine as linker, were prepared and characterised for application in supercapacitors. Detailed information about donor density, charge transfer resistance and chemical capacitance, which have important role in the performance of an electrochemical device, were studied by electrochemical methods. The results indicated the improvement of electrochemical performance of TiO2 nanohybrid electrode by DNA surface functionalisation. A supercapacitor was constructed from TiO2@DNA nanohybrids with PBS as electrolyte. From the supercapacitor experiment, it was found that the addition of DNA played an important role in improving the specific capacitance (Cs) of the TiO2 supercapacitor. The highest Cs value of 8 F/g was observed for TiO2@DNA nanohybrids. The nanohybrid electrodes were shown to be stable over long-term cycling, retaining 95% of their initial specific capacitance after 1500 cycles.
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| 8. |
- Imani, Roghayeh, et al.
(author)
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Band edge engineering of TiO2@DNA nanohybrids and implications for capacitive energy storage devices
- 2015
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In: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3364 .- 2040-3372. ; 7:23, s. 10438-10448
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Journal article (peer-reviewed)abstract
- Novel mesoporous TiO2@DNA nanohybrid electrodes, combining covalently encoded DNA with mesoporous TiO2 microbeads using dopamine as a linker, were prepared and characterised for application in supercapacitors. Detailed information about donor density, charge transfer resistance and chemical capacitance, which have an important role in the performance of an electrochemical device, were studied by electrochemical methods. The results indicated the improvement of electrochemical performance of the TiO2 nanohybrid electrode by DNA surface functionalisation. A supercapacitor was constructed from TiO2@DNA nanohybrids with PBS as the electrolyte. From the supercapacitor experiment, it was found that the addition of DNA played an important role in improving the specific capacitance (C-s) of the TiO2 supercapacitor. The highest Cs value of 8 F g(-1) was observed for TiO2@DNA nanohybrids. The nanohybrid electrodes were shown to be stable over long-term cycling, retaining 95% of their initial specific capacitance after 1500 cycles.
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| 9. |
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Intelligent nanomaterials
- 2016. - 2
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Editorial collection (peer-reviewed)abstract
- Overall, this book presents a detailed and comprehensive overview of the state-of-the-art development of different nanoscale intelligent materials for advanced applications. Apart from fundamental aspects of fabrication and characterization of nanomaterials, it also covers key advanced principles involved in utilization of functionalities of these nanomaterials in appropriate forms. It is very important to develop and understand the cutting-edge principles of how to utilize nanoscale intelligent features in the desired fashion. These unique nanoscopic properties can either be accessed when the nanomaterials are prepared in the appropriate form, e.g., composites, or in integrated nanodevice form for direct use as electronic sensing devices. In both cases, the nanostructure has to be appropriately prepared, carefully handled, and properly integrated into the desired application in order to efficiently access its intelligent features. These aspects are reviewed in detail in three themed sections with relevant chapters: Nanomaterials, Fabrication and Biomedical Applications; Nanomaterials for Energy, Electronics, and Biosensing; Smart Nanocomposites, Fabrication, and Applications.
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| 10. |
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Intelligent Nanomaterials, 2nd Edition.
- 2016
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Editorial collection (peer-reviewed)abstract
- Overall, this book presents a detailed and comprehensive overview of the state-of-the-art development of different nanoscale intelligent materials for advanced applications. Apart from fundamental aspects of fabrication and characterization of nanomaterials, it also covers key advanced principles involved in utilization of functionalities of these nanomaterials in appropriate forms. It is very important to develop and understand the cutting-edge principles of how to utilize nanoscale intelligent features in the desired fashion. These unique nanoscopic properties can either be accessed when the nanomaterials are prepared in the appropriate form, e.g., composites, or in integrated nanodevice form for direct use as electronic sensing devices. In both cases, the nanostructure has to be appropriately prepared, carefully handled, and properly integrated into the desired application in order to efficiently access its intelligent features. These aspects are reviewed in detail in three themed sections with relevant chapters: Nanomaterials, Fabrication and Biomedical Applications; Nanomaterials for Energy, Electronics, and Biosensing; Smart Nanocomposites, Fabrication, and Applications.
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| 11. |
- Karimian, Najmeh, et al.
(author)
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A potential-gated molecularly imprinted smart electrode for nicotinamide analysis
- 2015
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In: RSC Advances. - : Royal Society of Chemistry. - 2046-2069. ; 5:44, s. 35089-35096
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Journal article (peer-reviewed)abstract
- Triggered surface responsiveness paves the way for smart sensor technologies that not only have tunable retention, but also provide sensing through a built-in programming of electrode material. In this study, we report a potential-gated electrochemical sensor for determination of nicotinamide (NAM) based on a molecularly imprinted overoxidised polypyrrole electrode. The sensitive layer was prepared by electropolymerisation of pyrrole on a glassy carbon electrode in the presence of NAM as a template molecule, followed by alkali extraction. Electrochemical methods were used to monitor the processes of electropolymerisation, template removal and binding in the presence of a [Fe(CN)(6)](3-)/[Fe(CN)(6)](4-) redox couple as an electrochemical probe. Several factors affecting the performance of the MIP-modified electrode were investigated and optimized. The peak current of the ferro/ferricyanide couple decreased linearly with successive addition of NAM in the concentration range 0.9 x 10(-6) to 9.9 x 10(-3) M with a detection limit of 1.7 x 10(-7) M (S/N = 3). The molecularly-imprinted polymer (MIP) electrode had excellent recognition capability for NAM compared to structurally related molecules. Moreover, the reproducibility and repeatability of the NAM-imprinted electrode were all found to be satisfactory. The results from sample analysis confirmed the applicability of the NAM-imprinted electrode to reusable quantitative analysis in commercial pharmaceutical samples.
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| 12. |
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| 13. |
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| 14. |
- Mirzapoor, Aboulfazl, et al.
(author)
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Electrochemical detection of DNA mismatches using a branch-shaped hierarchical SWNT-DNA nano-hybrid bioelectrode
- 2019
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In: Materials science & engineering. C, biomimetic materials, sensors and systems. - : ELSEVIER. - 0928-4931 .- 1873-0191. ; 104
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Journal article (peer-reviewed)abstract
- Common approaches for DNA mutation detection are high cost and have difficult or complex procedure. We propose a fast quantitative method for recognition of DNA mutation based on SWNT/DNA self-assembled nanostructure. Covalent SWNT/DNA hybrid nanostructures are widely used in the fabrication of electrochemical biosensors. Interfacing carbon nanotubes with DNA in particular, is used as a detection method for the analysis of genetic disorders or the detection of mismatches in DNA hybridisation. We have designed a self-assembled, branch-shaped hybrid nanostructure by hybridisation of two sticky oligos that are attached to the ends of SWNTs via a linker oligo. These hybrid nanostructures showed a good conductivity that was greater than free SWNTs. Impedance spectroscopy studies illustrated that the conductivity of these hybrid nanostructures depended on the conformation and structure of the hybridised DNA. We demonstrated that the strategy of using SWNT/DNA self-assembled hybrid nanostructure fabrication yields sensitive and selective tools to discriminate mismatches in DNA. Cyclic voltammetry (CV) and impedance spectroscopy clearly revealed that the conductivity of the branch-shaped and hierarchical hybridised SWNT/DNA nanostructure is higher when matched, than when mismatched in a 1 and 1 hybridised SWNT/DNA nanostructure. Rapid biosensing of match and mismatch nanostructure based on carbon printed electrode showed similar results which can be used for rapid and fast detection of DNA mismatch.
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| 15. |
- Mishra, Prashant, et al.
(author)
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Electrocatalytic biofuel cell based on highly efficient metal-polymer nano-architectured bioelectrodes
- 2017
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In: Nano Energy. - : ELSEVIER SCIENCE BV. - 2211-2855 .- 2211-3282. ; 39, s. 601-607
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Journal article (peer-reviewed)abstract
- Bioenergy based devices are rapidly gaining significant research interest because of growing quest for future alternative energy resources, but most of the existing technologies suffer from poor electron transfer and slow mass transport, which hinder the fabrication of realistic high-power devices. Using a versatile strategy, here we have demonstrated the fabrication of nanoparticle-polymer framework based bioelectrocatalytic interfaces which facilitate a high mass-transport and thus offers the simple construction of advanced enzyme-based biofuel cells. It has been shown that a gold nanoparticle-structured polyaniline network can be effectively used as an electrical cabling interface providing efficient electron transfer for bio-anode and cathode. The resulting bioelectrodes are capable of excellent diffusional mass-transport and thus can easily facilitate the design of new and highly efficient membrane-less advanced bioenergy devices. The biofuel cell delivers a high-power density of about 2.5 times (i.e., 685 mu W cm(-2)) and open circuit voltage of 760 mV compared to conventional conducting polymer-based biofuel cells.
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| 16. |
- Mishra, Sachin, et al.
(author)
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Stimuli-enabled zipper-like graphene interface for auto-switchable bioelectronics.
- 2017
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In: Biosensors & bioelectronics. - : Elsevier. - 0956-5663 .- 1873-4235. ; 89, s. 305-311
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Journal article (peer-reviewed)abstract
- Graphene interfaces with multi-stimuli responsiveness are of particular interest due to their diverse super-thin interfacial behaviour, which could be well suited to operating complex physiological systems in a single miniaturised domain. In general, smart graphene interfaces switch bioelectrodes from the hydrophobic to hydrophilic state, or vice versa, upon triggering. In the present work, a stimuli encoded zipper-like graphene oxide (GrO)/polymer interface was fabricated with in situ poly(N-isopropylacrylamide–co–diethylaminoethylmethylacrylate), i.e., poly(NIPAAm–co–DEAEMA) directed hierarchical self-assembly of GrO and glucose oxidase (GOx). The designed interface exhibited reversible on/off-switching of bio-electrocatalysis on changing the pH between 5 and 8, via phase transition from super hydrophilic to hydrophobic. The study further indicated that the zipper-like interfacial bioelectrochemical properties could be tuned over a modest change of temperature (i.e., 20–40 °C). The resulting auto-switchable interface has implications for the design of novel on/off-switchable biodevices with ‘in-built’ self-control.
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| 17. |
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| 18. |
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| 19. |
- Osikoya, Adeniyi, et al.
(author)
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Acetylene-sourced CVD-synthesised catalytically active graphene for electrochemical biosensing
- 2017
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In: Biosensors and Bioelectronics. - : Elsevier. - 0956-5663 .- 1873-4235. ; 89, s. 496-504
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Journal article (peer-reviewed)abstract
- In this study, we have demonstrated the use of chemical vapour deposition (CVD) grown-graphene to develop a highly-ordered graphene-enzyme electrode for electrochemical biosensing. The graphene sheets were deposited on 1.00 mm thick copper sheet at 850 degrees C using acetylene (C2H2) as carbon source in an argon (Ar) and nitrogen (N-2) atmosphere. An anionic surfactant was used to increase wettability and hydrophilicity of graphene; thereby facilitating the assembly of biomolecules on the electrode surface. Meanwhile, the theoretical calculations confirmed the successful modification of hydrophobic nature of graphene through the anionic surface assembly, which allowed high-ordered immobilisation of glucose oxidase (GOx) on the graphene. The electrochemical sensing activities of the graphene-electrode was explored as a model for bioelectrocatalysis. The bioelectrode exhibited a linear response to glucose concentration ranging from 0.2 to 9.8 mM, with sensitivity of 0.087 A/M/cm(2) and a detection limit of 0.12 mu M (S/N=3). This work sets the stage for the use of acetylene-sourced CVD-grown graphene as a fundamental building block in the fabrication of electrochemical biosensors and other bioelectronic devices.
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| 20. |
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| 21. |
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| 22. |
- Parlak, Onur, et al.
(author)
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Hierarchical Aerographite nano-microtubular tetrapodal networks based electrodes as lightweight supercapacitor
- 2017
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In: Nano Energy. - : Elsevier BV. - 2211-2855 .- 2211-3282. ; 34, s. 570-577
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Journal article (peer-reviewed)abstract
- A great deal of interest has been paid to the application of carbon-based nano-and microstructured materials as electrodes due to their relatively low-cost production, abundance, large surface area, high chemical stability, wide operating temperature range, and ease of processing including many more excellent features. The nanostructured carbon materials usually offer various micro-textures due to their varying degrees of graphitisation, a rich variety in terms of dimensionality as well as morphologies, extremely large surface accessibility and high electrical conductivity, etc. The possibilities of activating them by chemical and physical methods allow these materials to be produced with further higher surface area and controlled distribution of pores from nanoscale upto macroscopic dimensions, which actually play the most crucial role towards construction of the efficient electrode/electrolyte interfaces for capacitive processes in energy storage applications. Development of new carbon materials with extremely high surface areas could exhibit significant potential in this context and motivated by this in present work, we report for the first time the utilization of ultralight and extremely porous nano-microtubular Aerographite tetrapodal network as a functional interface to probe the electrochemical properties for capacitive energy storage. A simple and robust electrode fabrication strategy based on surface functionalized Aerographite with optimum porosity leads to significantly high specific capacitance (640 F/g) with high energy (14.2 Wh/kg) and power densities (9.67x103 W/kg) which has been discussed in detail.
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| 23. |
- Parlak, Onur
(author)
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Interfacing nanomaterials for bioelectronic applications
- 2015
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Doctoral thesis (other academic/artistic)abstract
- The integration of nanomaterials between biological and electronic world has revolutionized the way of understanding how to generate functional bioelectronic device and open a new horizon for the future of bioelectronics. The use of nanomaterials as a versatile interface in the area of bioelectronics offers many practical solutions and recently outshines as an alternative method to overcome technical challenges to control and regulate the mean of communication between biological and electronics systems. Therefore, the interfacing nanomaterials yields broad platform of functional units for the integration as bioelectronic interfaces and starts to have a great importance to many fields within the life science.In parallel with the advancements for the successful combination of biological and electronic worlds using nanotechnology in a conventional way, a new branch of switchable bioelectronics based on signal-responsive materials and related interfaces have been emerged. The switchable bioelectronics consists of functional interfaces equipped with molecular cue that able to mimic and adapt their natural environment and change physical and chemical properties on demand. These switchable interfaces are essential to develop a range of technologies to understand function and properties of biological systems such as bio-catalysis, control of ion transfer and molecular recognition used in bioelectronics systems.This thesis focuses on both the integration of functional nanomaterials to improve electrical interfacing between biological system and electronics and also the generation of a dynamic interface having ability to respond real-life physical and chemical changes. The developing of such a dynamic interface allows one to understand how do living system probe and respond their changing environment and also help control and modulate bio-molecular interactions in a confined space using external physical and chemical stimuli. First, the integration of various nanomaterials is described to understand the effect of different surface modifications and morphologies using different materials on the basis of enzyme-based electrochemical sensing of biological analytes. Then, various switchable interfaces including temperature, light and pH, consist of graphene-enzyme and responsive polymer, are developed to control and regulate enzymebased biomolecular reactions. Finally, physically controlled programmable bio-interface which is described by “AND” and “OR” Boolean logic operations using two different stimuli on one electrode, is introduced. Together, the findings presented in this thesis lay the groundwork for the establishment switchable and programmable bioelectronics. The both approaches are promising candidates to provide key building blocks for future practical systems, as well as model systems for fundamental research.
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| 24. |
- Parlak, Onur, et al.
(author)
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Light-triggered switchable graphene-polymer hybrid bioelectronics
- 2016
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In: Advanced Materials Interfaces. - : Wiley-VCH Verlagsgesellschaft. - 2196-7350. ; 3:2, s. 1500353-1-1500353-7
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Journal article (peer-reviewed)abstract
- A light-switchable graphene interface to control and regulate electrobiocatalysis in a nanoconfined space is reported for the first time. The development of switchable and/or tunable interfaces on 2D nanosurfaces endowed with desirable functionalities, and incorporation of these interfaces into remote controlled biodevices, is a rapidly emerging area in bioelectronics.
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| 25. |
- Parlak, Onur, et al.
(author)
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pH-induced on/off-switchable graphene bioelectronics
- 2015
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In: Journal of materials chemistry. B. - : ROYAL SOC CHEMISTRY. - 2050-750X .- 2050-7518. ; 3:37, s. 7434-7439
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Journal article (peer-reviewed)abstract
- Switchable interfaces can deliver functionally reversible reactivity with their corresponding analytes, which thus allows one to positively respond the activity of biological elements, including enzymes and other biomolecules, through an encoded stimulus. We have realised this by the design of stimuli-responsive graphene interfaces for pH-encoded operation of bioelectronics. In this study, we have demonstrated stimuli-responsive graphene interfaces for pH-encoded operation of bioelectronics. The resulting switchable interfaces are capable of highly specific, on-demand operation of biosensors, which has significant potential in a wide range of analytical applications.
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| 26. |
- Parlak, Onur, et al.
(author)
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Programmable bioelectronics in a stimuli-encoded 3D graphene interfaces
- 2016
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In: Nanoscale. - : RSC Publishing. - 2040-3364 .- 2040-3372. ; 8, s. 9976-9981
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Journal article (peer-reviewed)abstract
- The ability to program and mimic the dynamic microenvironment of living organisms is a crucial step towards the engineering of advanced bioelectronics. Here, we report for the first time a design for programmable bioelectronics, with ‘built-in’ switchable and tunable bio-catalytic performance that responds simultaneously to appropriate stimuli. The designed bio-electrodes comprise light and temperature responsive compartments, which allow the building of Boolean logic gates (i.e. “OR” and “AND”) based on enzymatic communications to deliver logic operations.
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| 27. |
- Parlak, Onur, et al.
(author)
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Structuring Au nanoparticles on two-dimensional MoS2 nanosheets for electrochemical glucose biosensors.
- 2017
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In: Biosensors & bioelectronics. - : Elsevier. - 0956-5663 .- 1873-4235. ; 89:1, s. 545-550
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Journal article (peer-reviewed)abstract
- Two-dimensional (2D) bioelectronics is an emerging field of research which fuses the advantages of 2D nanomaterials with those of nanobiotechnology. Due to the various physical and chemical properties present in layered counterparts of 2D materials, including high charge density, large surface area, remarkable electron mobility, ready electron transport, sizeable band gaps and ease of hybridisation, they are set to become a versatile tool to fabricate sensitive and selective novel biodevices, which might offer an unique advantages to tackle key energy, medical and environmental issues. Current 2D bioelectronics research is focused on the design of simple-to-use and cheaper biodevices, while improving their selectivity, sensitivity and stability. However, current designs generally suffer from a lack of efficiency, relatively low sensitivity, slow electron transfer kinetics, high background charging current and low current density arising from poor mass transport. Here, we report a nanoparticle-structured MoS2 nanosheet as an ideal semiconductor interface, which is able to form a homogenous layer on the electrode surface for the assembly of gold nanoparticles. This not only enhances electrocatalytic reactions, but also provides excellent electrochemical properties such as high faradic-to-capacitive current ratios, high current density and electron mobility, and faster mass transport, due to the dominance of radial diffusion. The MoS2/Au NPs/GOx bioelectrode exhibits a linear response to glucose from 0.25 to 13.2 mM, with a detection limit of 0.042 µM (S/N=3) and sensitivity of 13.80 µA/µM/cm2.
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| 28. |
- Parlak, Onur, et al.
(author)
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Switchable Bioelectrocatalysis Controlled by Dual Stimuli-Responsive Polymeric Interface
- 2015
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In: ACS Applied Materials and Interfaces. - : AMER CHEMICAL SOC. - 1944-8244 .- 1944-8252. ; 7:43, s. 23837-23847
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Journal article (peer-reviewed)abstract
- The engineering of bionanointerfaces using stimuli-responsive polymers offers a new dimension in the design of novel bioelectronic interfaces. The integration of electrode surfaces with stimuli-responsive molecular cues provides a direct control and ability to switch and tune physical and chemical properties of bioelectronic interfaces in various biodevices. Here, we report a dual-responsive biointerface employing a positively responding dual-switchable polymer, poly(NIPAAm-co-DEAEMA)-b-HEAAm, to control and regulate enzyme-based bioelectrocatalysis. The design interface exhibits reversible activation deactivation of bioelectrocatalytic reactions in response to change in temperature and in pH, which allows manipulation of biomolecular interactions to produce on/off switchable conditions. Using electrochemical measurements, we demonstrate that interfacial bioelectrochemical properties can be tuned over a modest range of temperature (i.e., 20-60 degrees C) and pH (i.e., pH 4-8) of the medium. The resulting dual-switchable interface may have important implications not only for the design of responsive biocatalysis and on-demand operation of biosensors, but also as an aid to elucidating electron-transport pathways and mechanisms in living organisms by mimicking the dynamic properties of complex biological environments and processes.
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| 29. |
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| 30. |
- Parlak, Onur, et al.
(author)
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Switchable bioelectronics on graphene interface.
- 2015
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In: <em>Biosensing and Nanomedicine-VIII at SPIE Optics and Photonics</em>, San Diego, CA, 9-13 August 2015..
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Conference paper (peer-reviewed)abstract
- Smart and flexible bioelectronics on graphene have emerged as a new frontier in the field of biosensors and bioelectronics. Graphene has begun to be seen as an ideal signal transducer and a promising alternative for the production of low-cost bioelectronic devices.1-2 However, biological systems used in these devices suffer from a lack of control and regulation. There is an obvious need to develop “switchable” and “smart” interfaces for both fundamental and applied studies. Here, we report the fabrication of a stimuli-responsive graphene interface, which is used to regulate biomolecular reactions.The present study aims to address the design and development of a novel auto-switchable graphene bio-interface that is capable of positively responding, by creating smart nanoarchitectures. The smart bio-interface consists of a two-dimensional graphene donor and a polymeric receptor, which are rationally assembled together based in a stoichiometric donor-receptor interaction. By changing the external conditions such as temperature, light and pH of the medium, we acheived control of the biochemical interactions. In the negative mode, access of an associated enzyme to its substrate is largely restricted, resulting in a decrease in the diffusion of reactants and the consequent activity of the system. In contrast, the biosubstrate could freely access the enzyme facilitating bioelectrocatalysis in a positive response. More importantly, this provides the first example of responsive bioelectronics being achieved on a two-dimensional graphene interface by controlling the various external stimuli in an on/off-switchable model.Using electrochemical techniques, we demonstrated that interfacial bio-electrochemical properties can be tuned by modest changes in conditions. Such an ability to independently regulate the behaviour of the interface has important implications for the design of novel bioreactors, biofuel cells and biosensors with inbuilt self-control features.Reference:[1] O. Parlak, A. P. F. Turner, A. Tiwari, Advanced Materials, 3 (2014), 482.[2] O. Parlak, A. Tiwari, A. P. F. Turner, A. Tiwari, Biosensors and Bioelectronics 49 (2013), 53.
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| 31. |
- Patra, Hirak Kumar, et al.
(author)
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Inflammation-sensitive in situ smart scaffolding for regenerative medicine
- 2016
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In: Nanoscale. - : Royal Society of Chemistry. - 2040-3364 .- 2040-3372. ; 8:39, s. 17213-17222
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Journal article (peer-reviewed)abstract
- To cope with the rapid evolution of the tissue engineering field, it is now essential to incorporate the use of on-site responsive scaffolds. Therefore, it is of utmost importance to find new 'Intelligent' biomaterials that can respond to the physicochemical changes in the microenvironment. In this present report, we have developed biocompatible stimuli responsive polyaniline-multiwalled carbon nanotube/poly(N-isopropylacrylamide), (PANI-MWCNT/PNIPAm) composite nanofiber networks and demonstrated the physiological temperature coordinated cell grafting phenomenon on its surface. The composite nanofibers were prepared by a two-step process initiated with an assisted in situ polymerization followed by electrospinning. To obtain a smooth surface in individual nanofibers with the thinnest diameter, the component ratios and electrospinning conditions were optimized. The temperature-gated rearrangements of the molecular structure are characterized by FTIR spectroscopy with simultaneous macromolecular architecture changes reflected on the surface morphology, average diameter and pore size as determined by scanning electron microscopy. The stimuli responsiveness of the nanofibers has first been optimized with computational modeling of temperature sensitive components (coil-like and globular conformations) to tune the mechanism for temperature dependent interaction during in situ scaffolding with the cell membrane. The nanofiber networks show excellent biocompatibility, tested with fibroblasts and also show excellent sensitivity to inflammation to combat loco-regional acidosis that delay the wound healing process by an in vitro model that has been developed for testing the proposed responsiveness of the composite nanofiber networks. Cellular adhesion and detachment are regulated through physiological temperature and show normal proliferation of the grafted cells on the composite nanofibers. Thus, we report for the first time, the development of physiological temperature gated inflammation-sensitive smart biomaterials for advanced tissue regeneration and regenerative medicine.
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| 32. |
- Patra, Hirak Kumar, et al.
(author)
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On/off-switchable anti-neoplastic nanoarchitecture
- 2015
-
In: Scientific Reports. - : NATURE PUBLISHING GROUP. - 2045-2322. ; 5:14571, s. 1-9
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Journal article (peer-reviewed)abstract
- Throughout the world, there are increasing demands for alternate approaches to advanced cancer therapeutics. Numerous potentially chemotherapeutic compounds are developed every year for clinical trial and some of them are considered as potential drug candidates. Nanotechnology-based approaches have accelerated the discovery process, but the key challenge still remains to develop therapeutically viable and physiologically safe materials suitable for cancer therapy. Here, we report a high turnover, on/off-switchable functionally popping reactive oxygen species (ROS) generator using a smart mesoporous titanium dioxide popcorn (TiO2 Pops) nanoarchitecture. The resulting TiO2 Pops, unlike TiO2 nanoparticles (TiO2 NPs), are exceptionally biocompatible with normal cells. Under identical conditions, TiO2 Pops show very high photocatalytic activity compared to TiO2 NPs. Upon on/off-switchable photo activation, the TiO2 Pops can trigger the generation of high-turnover flash ROS and can deliver their potential anticancer effect by enhancing the intracellular ROS level until it crosses the threshold to open the death gate, thus reducing the survival of cancer cells by at least six times in comparison with TiO2 NPs without affecting the normal cells.
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| 33. |
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| 34. |
- Patra, Santanu, et al.
(author)
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2-Dimensional graphene as a route for emergence of additional dimension nanomaterials
- 2017
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In: Biosensors & bioelectronics. - : ELSEVIER ADVANCED TECHNOLOGY. - 0956-5663 .- 1873-4235. ; 89
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Journal article (peer-reviewed)abstract
- Dimension has a different and impactful significance in the field of innovation, research and technologies. Starting from one-dimension, now, we all are moving towards 3-D visuals and try to do the things in this dimension. However, we still have some very innovative and widely applicable nanomaterials, which have tremendous potential in the form of 2-D only i.e. graphene. In this review, we have tried to incorporate the reported pathways used so far for modification of 2-D graphene sheets to make is three-dimensional. The modified graphene been applied in many fields like supercapacitors, sensors, catalysis, energy storage devices and many more. In addition, we have also incorporated the conversion of 2-D graphene to their various other dimensions like zero-, one- or three-dimensional nanostructures. (C) 2016 Elsevier B.V. All rights reserved.
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| 35. |
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| 36. |
- Roy, Ekta, et al.
(author)
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Introduction of selectivity and specificity to graphene using an inimitable combination of molecular imprinting and nanotechnology
- 2017
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In: Biosensors & bioelectronics. - : ELSEVIER ADVANCED TECHNOLOGY. - 0956-5663 .- 1873-4235. ; 89, s. 234-248
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Journal article (peer-reviewed)abstract
- Recently, the nanostructured modified molecularly imprinting polymer has created a great attention in research field due to its excellent properties such as high surface to volume ratio, low cost, and easy preparation/handling. Among the nanostructured materials, the carbonaceous material such as graphene has attracted the tremendous attention of researchers owing to their fascinating electrical, thermal and physical properties. In this review article, we have tried to explore as well as compile the role of graphene-based nanomaterials in the fabrication of imprinted polymers. In other words, herein the recent efforts made to introduce selectivity in graphene-based nanomaterials were tried collected together. The major concern of this review article is focused on the sensing devices fabricated via a combination of graphene, graphene@nanoparticles, graphene@carbon nanotubes and molecularly imprinted polymers. Additionally, the combination of graphene and quantum dots was also included to explore the fluorescence properties of zero-band-gap graphene. (C) 2016 Elsevier B.V. All rights reserved.
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| 37. |
- Roy, Ekta, et al.
(author)
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RETRACTED: Single cell imprinting on the surface of Ag-ZnO bimetallic nanoparticle modified graphene oxide sheets for targeted detection, removal and photothermal killing of E. Coli
- 2017
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In: Biosensors & bioelectronics. - : ELSEVIER ADVANCED TECHNOLOGY. - 0956-5663 .- 1873-4235. ; 89, s. 620-626
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Journal article (peer-reviewed)abstract
- A very cost-effective, fast, sensitive and specific imprinted polymer modified electrochemical sensor for the targeted detection, removal and destruction of Escherichia coli bacteria was developed onto the surface of Ag-ZnO bimetallic nanoparticle and graphene oxide nanocomposite. The nanocomposite played a dual role in this work, as a platform for imprinting of bacteria as well as a participated in their laser-light induced photo killing. In terms of sensing, our proposed sensor can detect E. Coli as few as 10 CFU mL(-1) and capture 98% of bacterial cells from their very high concentrated solution (10(5) CFU mL(-1)). Similarly to the quantitative detection, we have also investigated the quantitative destruction of E. Coli and found that 16.0 cm(2) area of polymer modified glass plate is sufficient enough to kill 10(5) CFU mL(-1) in the small time span of 5 minutes. The obtained results suggest that our proposed sensor have potential to serve as a promising candidate for specific and quantitative detection, removal as well as the destruction of a variety of bacterial pathogens. (C) 2015 Elsevier B.V. All rights reserved.
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| 38. |
- Sharma, Deepali, et al.
(author)
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Studies on Bacterial Proteins Corona Interaction with Saponin Imprinted ZnO Nanohoneycombs and Their Toxic Responses
- 2015
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In: ACS Applied Materials and Interfaces. - : AMER CHEMICAL SOC. - 1944-8244 .- 1944-8252. ; 7:43, s. 23848-23856
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Journal article (peer-reviewed)abstract
- Molecular imprinting generates robust, efficient, and highly mesoporous surfaces for biointeractions. Mechanistic interfacial interaction between the surface of core substrate and protein corona is crucial to understand the substantial microbial toxic responses at a nanoscale. In this study, we have focused on the mechanistic interactions between synthesized saponin imprinted zinc oxide nanohoneycombs (SIZnO NHs), average size 80-125 nm, surface area 20.27 m(2)/g, average pore density 0.23 pore/nm and number-average pore size 3.74 nm and proteins corona of bacteria. The produced SIZnO NHs as potential antifungal and antibacterial agents have been studied on Sclerotium rolfsii (S. rolfsii), Pythium debarynum (P. debarynum) and Escherichia coil (E. coli), Staphylococcus aureus (S. aureus), respectively. SIZnO NHs exhibited the highest antibacterial (similar to 50%) and antifungal (similar to 40%) activity against Gram-negative bacteria (E. coil) and fungus (P. debarynum), respectively at concentration of 0.1 mol. Scanning electron spectroscopy (SEM) observation showed that the ZnO NHs ruptured the cell wall of bacteria and internalized into the cell. The molecular docking studies were carried out using binding proteins present in the gram negative bacteria (lipopolysaccharide and lipocalin Blc) and gram positive bacteria (Staphylococcal Protein A, SpA). It was envisaged that the proteins present in the bacterial cell wall were found to interact and adsorb on the surface of SIZnO NHs thereby blocking the active sites of the proteins used for cell wall synthesis. The binding affinity and interaction energies were higher in the case of binding proteins present in gram negative bacteria as compared to that of gram positive bacteria. In addition, a kinetic mathematical model (KMM) was developed in MATLAB to predict the internalization in the bacterial cellular uptake of the ZnO NHs for better understanding of their controlled toxicity. The results obtained from KMM exhibited a good agreement with the experimental data. Exploration of mechanistic interactions, as well as the formation of bioconjugate of proteins and ZnO NHs would play a key role to interpret more complex biological systems in nature.
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| 39. |
- Shukla, Sudheesh K., et al.
(author)
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Cholesterol Oxidase Functionalised Polyaniline/Carbon Nanotube Hybrids for an Amperometric Biosensor
- 2015
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In: Journal of Nanoscience and Nanotechnology. - : American Scientific Publishers. - 1533-4880 .- 1533-4899. ; 15:5, s. 3373-3377
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Journal article (peer-reviewed)abstract
- Functional carbon nanotubes (CNT) have attracted much attention for analytical and biomedical applications. This paper describes the fabrication of a cholesterol oxidase (ChOx) immobilised polyaniline (PANI)/CNT composite electrode for the amperometric detection of cholesterol. The prepared ChOx/PANI/CNT/Au bioelectrode bound ChOx via the available functionalties of PANI (-NH2) and CNT (-COOH). Moreover, the CNT creates a network inside the matrix that strengthens the mechanical property of the bioelectrode. The multifunctional matrix is presumed to provide a 3D-mesoporous surface, which substantially enhances enzyme activity. The linear range of the biosensor for cholesterol oleate was 30-280 mu M with a response time of 10 sec.
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| 40. |
- Shukla, Sudheesh K., et al.
(author)
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Optical fibre based non-enzymatic glucose sensing over Cu2+-doped polyaniline hybrid matrix
- 2017
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In: Sensors and actuators. B, Chemical. - : ELSEVIER SCIENCE SA. - 0925-4005 .- 1873-3077. ; 242, s. 522-528
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Journal article (peer-reviewed)abstract
- The opto-chemical glucose sensing over cupric ion doped polyaniline (Cu+2/PANI) hybrid polymer matrix coated glass rod based optode has been demonstrated.Cu+2/PANI hybrid matrix was synthesized by in situ chemical polymerization of intrinsically functionalized aniline. Furthermore, developed optode has been explored for direct oxidisation of glucose on Cu+2/PANI hybrid matrix for non-enzymatic glucose sensing employing O-dianisidine indicator system. The proposed glucose sensor works well in range of 50 mg/dL-200 mg/dL with response time of 15 s in artificial as well as in biological samples along with 40 days of lifespan. (C) 2016 Elsevier B.V. All rights reserved.
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| 41. |
- Tiwari, Ashutosh, et al.
(author)
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Intelligent Nanomaterials, 2nd Edition
- 2016. - 2
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In: Intelligent Nanomaterials, 2nd Edition. - : John Wiley & Sons. - 9781119242482 - 9781119242789 ; , s. 17-20
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Book chapter (peer-reviewed)
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| 42. |
- Tiwari, Ashutosh, 1978-, et al.
(author)
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Preface
- 2016
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In: <em>Intelligent Nanomaterials, 2nd Edition</em>.. - USA : Wiley-Scrivener. - 9781119242482 ; , s. xvii-xx
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Book chapter (peer-reviewed)
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| 43. |
- Tiwari, Ashutosh, et al.
(author)
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Preface
- 2015
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In: Advanced bioelectronics materials. - Beverly, MA, USA : Wiley-Scrivener. - 9781118998304 - 9781118998861 ; , s. XV-
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Book chapter (other academic/artistic)
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