The Experts below are selected from a list of 14868 Experts worldwide ranked by ideXlab platform
Yong Rok Lee - One of the best experts on this subject based on the ideXlab platform.
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high performance glucose biosensor based on green synthesized Zinc Oxide Nanoparticle embedded nitrogen doped carbon sheet
Journal of Electroanalytical Chemistry, 2018Co-Authors: Nallal Muthuchamy, Raji Atchudan, Thomas Nesakumar Jebakumar Immanuel Edison, Suguna Perumal, Yong Rok LeeAbstract:Abstract A new, highly selective, sensitive and stable enzymatic glucose sensor was fabricated on glassy carbon electrode (GCE) using Zinc Oxide (ZnO) Nanoparticles embedded nitrogen-doped carbon sheets (ZnO@NDCS), glucose oxidase (GOx) (assigned as GCE/ZnO@NDCS/GOx). First, ZnO@NDCS were synthesized by a simple hydrothermal method. Zn powder, aqueous ammonia, and peach extract were served as the precursor for ZnO NPs, nitrogen and carbon, respectively. The fabricated GCE/ZnO@NDCS/GOx biosensor exhibited a high and reproducible sensitivity of 231.7 μA mM−1 cm−2. Also, showed a wide linear range from 0.2 to 12 mM with a correlation coefficient R2 = 0.998 and lowest detection limit (based on S/N ratio = 3) of 6.3 μM. The GCE/ZnO@NDCS/GOx biosensor is acceptably stable, selective, and it was successfully applied to the quantitative monitoring of glucose in human blood serum. The synthesized ZnO@NDCS nanocomposite may be found useful in other applications in the fields of solar cells and optoelectronic devices. These encouraging results suggest a simple and effective method obtain electrode material for the enzymatic glucose sensor.
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direct solvothermal synthesis of Zinc Oxide Nanoparticle decorated graphene Oxide nanocomposite for efficient photodegradation of azo dyes
Journal of Photochemistry and Photobiology A-chemistry, 2017Co-Authors: Raji Atchudan, Thomas Nesakumar Jebakumar Immanuel Edison, Suguna Perumal, Mani Shanmugam, Yong Rok LeeAbstract:Abstract Zinc Oxide Nanoparticles decorated graphene Oxide (ZnO@GO) nanocomposite was successfully prepared using graphene Oxide (GO) and Zinc Oxide Nanoparticles (ZnO NPs) as raw materials by simple solvothermal method. The X-ray diffraction pattern, X-ray photoelectron spectroscopic, Fourier transform infrared spectroscopic, and Raman spectroscopic techniques revealed the formation, elemental composition and the purity of ZnO NPs and ZnO@GO nanocomposite. The ZnO NPs were synthesized via simple thermal oxidation, the synthesized ZnO NPs exhibits an excellent near spherical shape with narrow size distribution and mean size of around 20 ± 5 nm which is vividly observed from field emission scanning electron microscopic images. The elemental compositions of ZnO@GO nanocomposite which carbon, oxygen and Zinc were revealed by XPS and EDX elemental mapping. The ZnO NPs decorated on GO layers were clearly seen in the high resolution transmission electron microscopic images. The photocatalytic activities of the synthesized pure ZnO NPs and ZnO@GO nanocomposite were investigated by photodegradation of azo-dyes includes neutral red (NR), crystal violet (CV), congo red (CR) and methyl orange (MO) under UV-light irradiation. The results revealed that the ZnO@GO nanocomposite exhibited a remarkably higher photocatalytic efficiency compared to pure ZnO NPs. The enhancement of photocatalytic performance was ascribed to the synergistic effect between ZnO NPs and GO layers. Hence, the synthesized ZnO@GO nanocomposite crucial for efficient degradation of dyes such as NR, CV, CR and MO. The synthesized ZnO@GO nanocomposite exhibits a good photocatalytic activity along with good reproducibility of photodegradation, which is applicable for practical applications.
Joydeep Dutta - One of the best experts on this subject based on the ideXlab platform.
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chitosan Zinc Oxide Nanoparticle composite coating for active food packaging applications
Innovative Food Science and Emerging Technologies, 2016Co-Authors: Laila Alnaamani, Sergey Dobretsov, Joydeep DuttaAbstract:In this study antimicrobial properties of chitosan and chitosan-Zinc Oxide (ZnO) nanocomposite coatings on PE films were studied. Oxygen plasma pretreatment of PE films led to increased adhesion by ...
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photoelectrode optimization of Zinc Oxide Nanoparticle based dye sensitized solar cell by thermal treatment
International Journal of Electrochemical Science, 2012Co-Authors: Pichanan Teesetsopon, S Kumar, Joydeep DuttaAbstract:Interfacial properties at the photoelectrode of dye-sensitized solar cell (DSSC) play a vital role in determining its efficiency. This research examined the role of annealing temperature on the photoelectrode interfaces properties, and to find the annealing temperature that provides the highest overall solar cell efficiency. The electrical characteristics of the DSSC using ZnO Nanoparticles photoelectrode annealed at different temperatures were studied using electrochemical impedance spectroscopy (EIS), and the corresponding I-V characteristics were determined. The highest efficiency of the solar cells was obtained when the photoelectrode was annealed at 400°C. This is mainly due to the enhancement in charge collection by better ZnO crystallinity and reduction of interfacial charge transfer resistance at the ZnO/dye/electrolyte interface. Moreover, the electron recombination between transparent conducting Oxide substrate and electrolyte was also revealed for the first time by EIS.
Thomas J. Webster - One of the best experts on this subject based on the ideXlab platform.
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reduced staphylococcus aureus proliferation and biofilm formation on Zinc Oxide Nanoparticle pvc composite surfaces
Acta Biomaterialia, 2011Co-Authors: Justin T. Seil, Thomas J. WebsterAbstract:Abstract Conventional particulate Zinc Oxide (ZnO) is a known antibacterial agent. Studies have shown that reducing the size of ZnO particles to nanoscale dimensions further enhances their antibacterial properties. Polymers, like all biomaterials, run the risk of harboring bacteria which may produce an antibiotic-resistant biofilm. The addition of ZnO Nanoparticles to form a polymer composite material may thus reduce undesirable bacteria activity. The purpose of the present in vitro study was to investigate the antibacterial properties of ZnO Nanoparticles when incorporated into a traditional polymeric biomaterial. For this purpose, Staphylococcus aureus were seeded at a known cell density onto coverslips coated with a film of polyvinyl chloride (PVC) with varying concentrations of ZnO Nanoparticles. Samples were cultured for 24 or 72 h. Methods of analysis, including optical density readings and crystal violet staining, indicated a reduced presence of a biofilm on ZnO Nanoparticle polymer composites compared to pure polymer controls. Live/dead bacteria assays provided images to confirm the reduced presence of active bacteria on samples with Zinc Oxide Nanoparticles. Conditioning of the cell culture medium by the composites was also investigated by measuring concentrations of elemental Zinc (Zn2+) and bacteria growth in the presence of conditioned medium. This study demonstrated that the development of ZnO polymer composites may improve biomaterial effectiveness for numerous applications, such as endotracheal tubes, catheterp and implanted biomaterials, which are prone to bacterial infection.
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Decreased astroglial cell adhesion and proliferation on Zinc Oxide Nanoparticle polyurethane composites
International Journal of Nanomedicine, 2008Co-Authors: Justin T. Seil, Thomas J. WebsterAbstract:Nanomaterials offer a number of properties that are of interest to the field of neural tissue engineering. Specifically, materials that exhibit nanoscale surface dimensions have been shown to promote neuron function while simultaneously minimizing the activity of cells such as astrocytes that inhibit central nervous system regeneration. Studies demonstrating enhanced neural tissue regeneration in electrical fields through the use of conductive materials have led to interest in piezoelectric materials (or those materials which generate a transient electrical potential when mechanically deformed) such as Zinc Oxide (ZnO). It has been speculated that ZnO Nanoparticles possess increased piezoelectric properties over ZnO micron particles. Due to this promise in neural applications, the objective of the present in vitro study was, for the first time, to assess the activity of astroglial cells on ZnO Nanoparticle polymer composites. ZnO Nanoparticles embedded in polyurethane were analyzed via scanning electron microscopy to evaluate nanoscale surface features of the composites. The surface chemistry was characterized via X-ray photoelectron spectroscopy. Astroglial cell response was evaluated based on cell adhesion and proliferation. Astrocyte adhesion was significantly reduced on ZnO Nanoparticle/polyurethane (PU) composites with a weight ratio of 50:50 (PU:ZnO) wt.%, 75:25 (PU:ZnO) wt.%, and 90:10 (PU:ZnO) wt.% in comparison to pure PU. The successful production of ZnO Nanoparticle composite scaffolds suitable for decreasing astroglial cell density demonstrates their potential as a nerve guidance channel material with greater efficiency than what may be available today.
Yulong Ding - One of the best experts on this subject based on the ideXlab platform.
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Zinc Oxide Nanoparticle coated films fabrication characterization and antibacterial properties
Journal of Nanoparticle Research, 2015Co-Authors: Yunhong Jiang, Alex J Oneill, Yulong DingAbstract:In this article, novel antibacterial PVC-based films coated with ZnO Nanoparticles (NPs) were fabricated, characterized, and studied for their antibacterial properties. It was shown that the ZnO NPs were coated on the surface of the PVC films uniformly and that the coating process did not affect the size and shape of the NPs on the surface of PVC films. Films coated with concentrations of either 0.2 or 0.075 g/L of ZnO NPs exhibited antibacterial activity against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, but exhibited no antifungal activity against Aspergillus flavus and Penicillium citrinum. Smaller particles (100 nm) exhibited more potent antibacterial activity than larger particles (1000 nm). All ZnO-coated films maintained antibacterial activity after 30 days in water.
S M Hosseini - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of polyvinylchloride based nanocomposite thin film filled with Zinc Oxide Nanoparticles: Morphological, thermal and optical characteristics
Journal of Industrial and Engineering Chemistry, 2015Co-Authors: M. Zarrinkhameh, A Zendehnam, S M HosseiniAbstract:PVC-co-ZnO nanocomposite film was prepared by solution casting technique with different concentration of Zinc Oxide Nanoparticle. Optical measurements showed that utilizing Zinc Oxide Nanoparticle in polymeric matrix caused to increase of UV absorption obviously. X-ray diffraction showed polycrystalline structure with no preferred orientation for prepared nanocomposite films. Atomic force microscopy images also showed smooth surfaces for the nanocomposite films. The thermal properties investigation of prepared films revealed that utilizing ZnO Nanoparticles in polymeric matrix accelerated the polymer decomposition which was assigned to catalytic behavior of Zinc Oxide Nanoparticles. Moreover, utilizing Zinc Oxide Nanoparticles enhanced the char yield of prepared films.
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Electrochemical, morphological and antibacterial characterization of PVC based cation exchange membrane modified by Zinc Oxide Nanoparticles
Journal of Polymer Research, 2013Co-Authors: M. Zarrinkhameh, A Zendehnam, S M HosseiniAbstract:In the current research, mixed matrix polyvinylchloride based heterogeneous cation exchange membranes were prepared by solution casting technique. Zinc Oxide Nanoparticle was also utilized as additive in membrane fabrication. The effect of ZnO Nanoparticles concentration in casting solution on physico-chemical and antibacterial characteristics of membranes was studied. SEM images showed compressed structure for the modified membranes. Images also exhibited relatively uniform surfaces for the membranes. 3D SEM images showed smooth surface for membranes at high ZnO loading ratio content. X-ray diffraction results revealed that membrane crystalinity was improved by increase of Nanoparticles’ concentration. The membrane selectivity and transport number were increased initially by increase of additive content up to 8 %wt in casting solution and then showed decreasing trend by more ZnO concentration to 16 %wt. The membrane ionic flux also enhanced initially by increase of Zinc Oxide Nanoparticles content up to 4 %wt and then began to decrease. The modified membrane containing 4 %wt Zinc Oxide Nanoparticles showed superior characteristics compared to other modified membranes and pristine/unmodified ones. The modified membranes also showed good ability in E.coli removal.
