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- Hasan, Md Nur, et al.
(author)
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Functionalized nano-MOF for NIR induced bacterial remediation : A combined spectroscopic and computational study
- 2022
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In: Inorganica Chimica Acta. - : Elsevier. - 0020-1693 .- 1873-3255. ; 532
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Journal article (peer-reviewed)abstract
- Antimicrobial infection has emerged as one of the principal health problems in the world that requires urgent effective prevention. In order to deal with this reality, antibacterial photodynamic therapy using photosensitizers such as IR820 is one of the most encouraging and innovative methodologies to combat bacteria-caused infections. However, their activity is limited due to low photostability, short circulation, and lack of targeted bio-distribution. Herein, we have developed a user-friendly and universal approach to overcome such limitations of cyanine dye IR820 by encapsulating it with zeolitic imidazolate framework-8 (ZIF-8) keeping its activity intact. The synthesized ZIF8-IR820 nano-MOFs are characterized using electron microscopic and optical spectroscopic techniques. Moreover, the formation of hybrids is confirmed from the charge transfer process obtained from time resolved fluorescence transient and first principles DFT based analysis. The ultrafast charge transfer dynamic enhances the red-light sensitive reactive oxygen species (ROS) production capability which is further catalyzed in acidic pH and DFT based calculation validates the experimental results. The enhanced ROS production of ZIF8-IR820 nano-MOFs makes it superior in NIR induced antibacterial activity. Overall, the study demonstrates a detailed physical understanding of photosensitizer encapsulated nano-MOF system which shows efficient NIR light induced photo-dose dependent antibacterial activity that can be beneficial for potential bacterial remediation.
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| 2. |
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| 3. |
- Pan, Nivedita, et al.
(author)
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Near-Infrared Active Tri-nanohybrid for Enhanced Energy Harvesting
- 2024
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In: CHEMISTRYSELECT. - : Wiley-VCH Verlagsgesellschaft. - 2365-6549. ; 9:13
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Journal article (peer-reviewed)abstract
- Efficient energy harvesting through full solar spectrum utilization has been considered a promising solution to world energy and environmental issues. In this direction, lead sulphide (PbS) quantum dot (QD) based hybrid materials find greater application due to their near-infrared (NIR) active photo response. Slower charge injection and inefficient charge separation limit photoactive response of such NIR active low band gap semiconductor like PbS QDs. Moreover, constructing dual charge transfer pathways in a PbS QDs based nanocomposite through the formation of hybrids with suitable materials can be advantageous in suppressing the charge recombination. In this work, we have synthesized a nanocomposite after decorating the PbS-QDs with semiconducting TiO2 nanoparticles modified with multiwall carbon nanotubes (MWCNT) and thus forming the tri-hybrid (PbS-TiO2-MWCNT) nanocomposites. The enhanced photo-activities of the tri-hybrid, as compared to di-hybrids like PbS-TiO2, PbS-MWCNT were confirmed by the steady state, time-resolved photoluminescence (TRPL) measurements and reactive oxygen species (ROS) generation measurements. Higher ROS generation in the tri-hybrid has been correlated with a faster interfacial electron transfer due to the dual charge injection pathway of PbS QD to TiO2 and MWCNT. The enhanced activity of the trio-hybrid has also been analyzed from the first principal calculations in light of an efficient interfacial electron transfer as a result of the dual charge injection pathway. The photoelectrochemical water-spilling response of the photoanodes in terms of photocurrent density, electrochemical impedance, and Mott-Schottky measurements on PbS-TiO2 and PbS-TiO2-MWCNT photoanodes reveal that a combination of MWCNT and TiO2 exhibits an increase in electrical double layer capacitance, decrease in series resistance and enhancement of carrier density with NIR illumination at the heterojunction. Overall, all the dynamical studies at the interface of the trihybrid-based photoanodes demonstrate its potential of utilization as a futuristic NIR- active photoelectrochemical water-splitting material.
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