| 1. |
- Lal, Ramesh, et al.
(author)
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Chemically Coupled Multiwall Carbon Nanotubes with Leaf-Like Nanostructures of NiO for Sensitive and Selective Determination of Uric Acid
- 2021
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In: Journal of Electronic Materials. - : SPRINGER. - 0361-5235 .- 1543-186X. ; 50:5, s. 2852-2859
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Journal article (peer-reviewed)abstract
- The chemical coupling of NiO nanostructures with thermally treated multiwall carbon nanotubes (MWCNTs) is not reported as it provides an enhanced dispersion of composite material in water. The dispersion of MWCNTs has been considered a big challenge. For this purpose, we first thermally treated MWCNTs at 1000 degrees C in air for 30 min. Then, thermally treated MWCNTs were chemically coupled with NiO nanostructures by a hydrothermal method. The material characterization in terms of structure, morphology, and composition is well studied by different analytical techniques. The NiO composite (sample 2) with highest weight of MWCNTs had a leaf-like morphology and it exhibits a cubic phase of NiO. Cyclic voltammetry (CV) was used to study the electrochemical activity of prepared composite material towards the oxidation of uric acid in the phosphate buffer solution of pH 7.0. Sample 2 showed a well-behaved anodic peak with enhanced peak current and exhibited a linear range from 0.01 mM to 2.5 mM for uric acid with a low limit of detection 0.001mM. Sample 2 was found to be very selective under the environment of competing interferents such as urea, glucose, lactic acid and ethanol. This sample exhibits significant stability, thus it is a potential protocol for the monitoring of uric acid from real samples. This study provides a low-cost platform for the fabrication of efficient materials for various applications such as batteries, fuel cells and water splitting.
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| 2. |
- Lu, Xiuzhen, et al.
(author)
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Enhanced Mechanical and Thermal Properties of Ag Joints Sintered by Spark Plasma Sintering
- 2022
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In: Journal of Electronic Materials. - : Springer Science and Business Media LLC. - 1543-186X .- 0361-5235. ; 51:11, s. 6310-6319
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Journal article (peer-reviewed)abstract
- Nano-silver paste has been considered to be one of the most promising materials for interconnects of semiconductor devices operating at high temperature. However, its application is limited by conventional sintering methods due to the long dwell time. In this paper, a spark plasma sintering (SPS) technique with a very short sintering time of no more than 5 min was explored for the sintering of nano-silver paste. The effects of sintering conditions including pretreatment time, sintering temperature, dwell time and applied pressure on shear strength and thermal conductivity of the sintered Ag joints were investigated. The shear strength of sintered Ag joints increased as the sintering temperature and applied pressure increased. Robust sintered Ag joints with an average shear strength of 40.18 MPa were obtained by sintering at 300 degrees C for 5 min under a pressure of 3 MPa. The thermal properties were improved by pretreating the nano-silver paste for a shorter time. Thermal conductivity of 41.50 W m(-1) K-1 is obtained for samples pretreated for 25 min and sintered at 250 degrees C for 5 min.
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| 3. |
- Salve, Maruti V., et al.
(author)
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Highly Crystalline and Stoichiometric Growth of CdTe by Cost-Effective Hydrothermal Technique
- 2024
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In: JOURNAL OF ELECTRONIC MATERIALS. - 0361-5235 .- 1543-186X.
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Journal article (peer-reviewed)abstract
- CdTe powder samples have been synthesized using a hydrothermal approach, employing cadmium acetate and tellurium dioxides as sources of Cd and Te, respectively. NaBH4 was utilized as the reducing agent, and double-distilled water was used as the solvent in the synthesis process. The effect of annealing on the synthesized samples was investigated. The samples have been characterized by x-ray powder diffraction, Raman spectroscopy, UV-Vis-NIR spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and x-ray photoelectron spectroscopy. The electrical properties (current-voltage and capacitance-voltage) of the as-prepared and annealed CdTe pellets were investigated. These findings indicate that annealing can lead to improvements in crystallinity, crystallite size, and electrical conductance. This paper presents a simple, cost-effective, and versatile method for producing significant amounts of CdTe nanostructure powders with properties suitable for use in the fabrication of CdS/CdTe solar cells.
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| 4. |
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| 5. |
- Waryani, Baradi, et al.
(author)
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The Enzyme Free Uric Acid Sensor Based on Iron Doped CuO Nanostructures for the Determination of Uric Acid from Commercial Seafood
- 2020
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In: Journal of Electronic Materials. - : SPRINGER. - 0361-5235 .- 1543-186X. ; 49:10, s. 6123-6129
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Journal article (peer-reviewed)abstract
- In this study, a wet chemical method was used to produce iron-doped CuO nanostructures. Cyclic voltammetry was employed to record sensor signals in a saline phosphate buffer solution of pH 7.3. Iron added into CuO nanostructures contributed electrons to the conduction band of CuO, showing a well-resolved electro-oxidation peak for uric acid. The developed sensor exhibits a wide linear range of uric acid concentrations from 0.05 mM to 4 mM. The limit of detection for the sensor was found to be 0.01 mM. The sensor is highly selective, sensitive, and stable. The results of the in vitro analysis of uric acid motivated the researchers to measure the uric acid from the marine shellfishPerna viridisand razor clamSolen dactylus. The obtained results reveal that the proposed sensor will help to avoid the gout and could be used as an early safeguard of human health.
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| 6. |
- Yan, Yinglin, et al.
(author)
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Sakura Derived Hierarchical Porous Carbons As a High-Performance Cathode Host for Lithium-Sulfur Batteries
- 2022
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In: Journal of Electronic Materials. - : Springer Nature. - 0361-5235 .- 1543-186X. ; 51:1, s. 57-67
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Journal article (peer-reviewed)abstract
- Sakura petals were collected as raw materials for the manufacture of porous carbon hosts for use as cathodes in lithium-sulfur (Li-S) batteries by a direct pyrolysis method and chemical activation process. The evolution of the morphology and microstructure of sakura petal-derived carbon materials was investigated in detail. Furthermore, the electrochemical performance of Li-S batteries assembled from composite cathodes with sakura petal-derived carbon products as the host and pure sulfur as the active material were systematically researched. The results indicated that the morphology of the products changed from a plate-like morphology to plates with ordered grooves and then to a wrinkled sheet-like morphology. In addition, many micropores were formed during the activation process. Moreover, the sample that underwent two-step activation exhibited an improved specific discharging capacity, cycling performance and rate performance. In summary, the sakura-derived carbon host is expected to assist in the future application of Li-S batteries.
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| 7. |
- Zhang, Yong, 1982, et al.
(author)
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Improved Thermal Properties of Three-Dimensional Graphene Network Filled Polymer Composites
- 2022
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In: Journal of Electronic Materials. - : Springer Science and Business Media LLC. - 1543-186X .- 0361-5235. ; 51:1, s. 420-425
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Journal article (peer-reviewed)abstract
- This paper presents the improved thermal property of three-dimensional (3D) graphene network modified polydimethylsiloxane (PDMS) composites. It shows that with a 2 wt.% loading of graphene foams (GF), the thermal conductivity of GF/PDMS composite was successfully increased from 0.19 W/mK to 0.42 W/mK, which is 2.2 times higher than that of neat PDMS. However, if GF was transformed into graphene sheets (GS) by sonication, the thermal conductivity of GS/PDMS was decreased to 0.28 W/mK. The remarkable improvement of the thermal properties is attributed to the 3D interconnected graphene network in GF, which form continuous heat transfer networks. Furthermore, the finite element analysis was conducted to evaluate the effect of GFs in composites, where some parameters such as thickness and thermal conductivity were analyzed and discussed. Our results indicate that the continuous 3D GFs holds great potential as fillers to improve the thermal property of polymer materials.
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