Structural and optical properties of unannealed and annealed ZnO nanoparticles prepared by a chemical precipitation technique

Goswami, Navendu; Sharma, Dhirendra Kumar

doi:10.1016/j.physe.2010.01.023

Cited by 109 publications

(55 citation statements)

References 44 publications

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“…Synthesis of ZnO particles with a precipitation method in alcohol solution is the most commonly used and promising lowcost route [11][12][13]. However, ZnO particles aggregate easily in solution due to van der Waals forces and surface effects [14]. Therefore, the surface of ZnO particles must be modified with an organic reagent or stable polymers to decrease aggregation [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zinc Oxide/Graphene Oxide Nanocomposites as Antibacterial Materials Against Staphylococcus Aureus and Escherichia Coli

Hieu¹

2018

JST

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New materials with good antibacterial activity and less toxicity to other species have attracted numerous research interests. Modified Hummers method was used for preparing graphene oxide (GO). Zinc oxide/graphene oxide (ZnO/GO) nanocomposites were synthesized with three different ratios (0.5:1, 1:1, and 2:1) by solution precipitation method. The ZnO/GO nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, Brunauer-Emmett-Tellerspecific surface area, and transmission electron microscopy image. The characterization results showed that ZnO nanoparticles with a mean size of 12-18 nm were randomly decorated on the surfaces and edges of GO sheets. ZnO/GO 1:1 with a high specific surface area of 65 m 2 /g was obtained. The antibacterial activity of ZnO, GO, and ZnO/GO was tested against Gram negative bacteria escherichia coli (E. coli) and Gram positive bacteria staphylococcus aureus (S. aureus) using well diffusion method. The test results confirmed that antibacterial activity of ZnO/GO was higher than that of GO and ZnO. Additionally, the ZnO/GO with the ratio of 1:1 is the strongest activity and more active against S. aureus than against E. coli and minimal inhibitory concentration (MIC) value of ZnO/GO 1:1 is 80 µg/mL for S. aureus and 160 µg/mL for E. coli. This novel nanocomposite could be used as a potential material for antimicrobial application.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Zinc Oxide/Graphene Oxide Nanocomposites as Antibacterial Materials Against Staphylococcus Aureus and Escherichia Coli

Hieu¹

2018

JST

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“…It has a wide band gap of 3.37 eV and large exiton binding energy of 60 meV. It exhibits high electrical conductivity, high infra-red reflectance and high visible transmittance, which make ZnO to be useful over a wide variety of applications including electronic, optoelectronic devices, gas sensors, transparent conducting electrodes, laser diodes, thin film transistors, UV & blue LEDs, surface acoustic wave devices, display devices, and catalysis etc [12][13][14][15] . Further, it is inexpensive, abundant in availability and environmentally friendly, when compared to other wide band gap semiconductors 16 .…”

Section: Introductionmentioning

confidence: 99%

HIGH-TEMPERATURE PHASE TRANSFORMATIONS AND DYNAMICS OF ZnO NANOPARTICLES INCORPORATED 4- CYANO-4'-PENTYLBIPHENYL MESOGEN

Raju¹

2017

Rasayan J. Chem.

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Synthesis of Zinc Oxide nanoparticles through chemical precipitation method was done taking aqueous solutions of Zinc Nitrate and Sodium Hydroxide as precursors. Elemental, structural and optical absorption studies of the ZnO nanoparticles were investigated using Energy Dispersive, X-Ray Diffraction and UV-Visible spectroscopy. The prepared nanoparticles were studied for their effect on familiar display device materials called liquid crystal/mesogen. ZnO nanoparticles were introduced in the lattice of 4-cyano-4'-pentylbiphenyl (5CB) mesogen through dispersion technique. ZnO nanoparticles incorporated 5CB is characterized through Polarizing Optical Microscopy, X-Ray Diffraction and Image Analysis using MATLAB software. From these studies, it was revealed that the presence of ZnO nanoparticles in liquid crystal enhanced the properties of pure 5CB. It was observed that the transition temperatures and crystallinity of ZnO nanoparticles incorporated mesogens were remarkably increased when compared to the pure counterpart which is a preferable feature in terms of the application of these samples. In addition, novel phases were observed in the doped liquid crystal sample at very high temperatures. These changes are assigned to the enhanced surface area to volume ratio of nanoparticles, which in turn improves their catalytic activity. ZnO nanoparticles incorporated 5CB mesogen is one among the liable materials for display devices and biosensor applications due to reduced energy consumption.

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“…[9][10][11] However, ZnO particles aggregate easily in solution due to van der Waals forces and surface effects. 12 Therefore, the surface of ZnO particles must be modified with an organic reagent or stable polymers to decrease aggregation. [13][14][15] In this study, we separated ZnO particles by anchoring them on the surface of graphene oxide sheets, thus achieving more stable and dispersed composites.…”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25] In this study, we examined the antibacterial properties of ZnO/graphene oxide composites with a microdilution method and live/ dead assay. 12,[26][27] The experimental results showed minimum inhibitory concentrations (MICs) of 6.25 µg/mL for Escherichia coli and Salmonella typhimurium, 12.5 µg/mL for Bacillus subtilis, and 25 µg/mL for Enterococcus faecalis.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide-modified ZnO particles: synthesis, characterization, and antibacterial properties

Zhong

Yun

2015

IJN

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Nanosized ZnO particles with diameters of 15 nm were prepared with a solution precipitation method at low cost and high yield. The synthesis of the particles was functionalized by the organic solvent dimethylformamide, and the particles were covalently bonded to the surface of graphene oxide. The morphology of the graphene oxide sheets and ZnO particles was confirmed with field emission scanning electron microscopy and biological atomic force microscopy. Fourier transform infrared spectroscopy and X-ray diffraction were used to analyze the physical and chemical properties of the ZnO/graphene oxide composites that differed from those of the individual components. Enhanced electrochemical properties were detected with cyclic voltammetry, with a redox peak of the composites at 0.025 mV. Excellent antibacterial activity of ZnO/graphene oxide composites was observed with a microdilution method in which minimum inhibitory concentrations of 6.25 µg/mL for Escherichia coli and Salmonella typhimurium , 12.5 µg/mL for Bacillus subtilis , and 25 µg/mL for Enterococcus faecalis . After further study of the antibacterial mechanism, we concluded that a vast number of reactive oxygen species formed on the surface of composites, improving antibacterial properties.

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Structural and optical properties of unannealed and annealed ZnO nanoparticles prepared by a chemical precipitation technique

Cited by 109 publications

References 44 publications

Synthesis of Zinc Oxide/Graphene Oxide Nanocomposites as Antibacterial Materials Against Staphylococcus Aureus and Escherichia Coli

Synthesis of Zinc Oxide/Graphene Oxide Nanocomposites as Antibacterial Materials Against Staphylococcus Aureus and Escherichia Coli

HIGH-TEMPERATURE PHASE TRANSFORMATIONS AND DYNAMICS OF ZnO NANOPARTICLES INCORPORATED 4- CYANO-4'-PENTYLBIPHENYL MESOGEN

Graphene oxide-modified ZnO particles: synthesis, characterization, and antibacterial properties

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