A Comparative Analysis of the Properties of Zinc Oxide (ZnO) Nanoparticles Synthesized by Hydrothermal and Sol-Gel Methods

Preethi, S.; Anitha, A; Senthilkumar, N.

doi:10.17485/ijst/2016/v9i40/92696

Cited by 16 publications

(9 citation statements)

References 11 publications

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“…compared with the bulk size that occurred at 350 nm and in the visible spectrum of the wavelength band. Figure 5 shows band gap energy graph of zinc oxide nanoparticle at 500 rpm, the obtained band gap energy was 3.50 eV which is agreement with research study reported by [23,24]. This shows thickness of plant extract and ZnO.NPs composites has effect on photon energy absorption.…”

Section: Uv-vis Spectra Analysis Of Zinc Oxide Nanoparticlessupporting

confidence: 86%

Green synthesis and characterization of zinc oxide nanoparticles using bashful (Mimosa pudica), leaf extract: a precursor for organic electronics applications

et al. 2020

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Efforts has been intensified in the field of research for nanomaterials to bridge the gap for energy supply in this century. A plant-based material that may provide solutions to the current energy crisis may be found in nanomaterials. Green synthesis of nanoparticles using plant extract is gaining importance as an alternative to conventional chemical and physical method of synthesis, because of its simplicity and environmental friendliness. In this research we synthesized Zinc oxide nanoparticle (ZnO.NPs) using plant extracts and deposited using spin-coating technique. The obtained samples were characterized by UltraViolet-Visible spectrophotometer, Fourier Transform Infra-Red spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Solar simulator for electrical properties. The maximum absorption peaks occurred at 235 nm, 250 nm, 270 nm, and 300 nm respectively but lower when compared with the bulk size that occurred at 350 nm and in the visible spectrum of the wavelength band. Band gap energy of zinc oxide nanoparticle at 500 rpm was 3.50 eV. ZnO.NPs FTIR spectrum was recorded in the range of 4000-500 cm −1 . The synthesis ZnO NPs FTIR result shows Zn-O functional group was found at low wavenumber. SEM images of the samples give information on the morphology which are spherical and granular nature. The XRD pattern of synthesized nanoparticles shows that the substances only belong to ZnO since there is no diffraction peaks of other impurities and the average grain size of the particles was estimated to be 14.7 nm. ZnO.NPs thin film device under illumination has efficiency of 0.7%. Based on electrical properties of the fabricated thin film device, the parameter shows it could be suitable for photoanode of Dye sensitized solar cell.

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Section: Uv-vis Spectra Analysis Of Zinc Oxide Nanoparticlessupporting

confidence: 86%

Green synthesis and characterization of zinc oxide nanoparticles using bashful (Mimosa pudica), leaf extract: a precursor for organic electronics applications

et al. 2020

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“…On the other hand, the full width at half maximum (FWHM) of ZnO NPs decreased as the temperature increased [28][29]. The result also indicated increment in the crystal size of ZnO NPs as the calcination temperature increased was in good agreement with the result reported previously [30][31][32][33].…”

Section: X-ray Diffraction (Xrd) Analysissupporting

confidence: 90%

Antimicrobial Activity of Chemical, Thermal and Green Route-Derived Zinc Oxide Nanoparticles: A Comparative Analysis

Kasahun¹,

Yadate²,

Belay³

et al. 2020

Nano BioMed ENG

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In this study, antimicrobial activity of zinc oxide (ZnO) nanoparticles (NPs) synthesized by different chemical, thermal and green routes were systematically investigated with an aim to determine which method yields the most efficient antimicrobial property. The methodologies employed in this study were sol-gel, thermal decomposition, precipitation and green synthesis routes. The physical and optical properties of synthesized ZnO NPs were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet-visible spectroscopy (UV-Vis) and fluorescence spectroscopy. The results of the XRD and SEM analysis indicated the size and shape of the particles, depending on synthesis methodology and calcination temperature. The optical properties of the ZnO NPs investigated using UV-Vis absorption and photoluminescence spectra were also depending on the synthesized route. The antimicrobial activity of the ZnO NPs was tested against gram-negative bacteria (E. coli, P. aeruginosa and S. typhi), gram-positive bacteria (S. aureus and B. subtilis) and fungus (C. albicans) using agar-well diffusion method. Effects of size, shape of the crystal and concentration on the antimicrobial activity were investigated. The experimental results showed that the antimicrobial activity of ZnO NPs increased with decreasing size of the crystal. It was also found that the gram-positive bacteria were more sensitive to ZnO NPs than gram-negative bacteria and fungus. Interestingly, ZnO NPs synthesized using the green route showed more effective antimicrobial activity than those using the chemical or the thermal route.

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“…Any number of metallic salts can be reduced to produce the corresponding NPs likesilver, gold, iron, zinc oxide, copper, cobalt, palladium, platinum, etc. Reduction of these salts can be achieved by various chemical agentsamino-boranes [26], hydrazine [27], oleylamine [28], polyols, oxalic acid [29], sugar [30], citrate-the Turkevich method [31] and sodium borohydride (NaBH 4 ) BrustÀ Schiffrin synthesis (BSS) [32]. However, gold and AgNPs are synthesized majorly through Turkevich method and NaBH 4 BSS, respectively.…”

Section: Chemical Methodsmentioning

confidence: 99%

Role of gold and silver nanoparticles in cancer nano-medicine

Chugh

Sood

Chandra

et al. 2018

Artificial Cells, Nanomedicine, and Biotechnology

243

119

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Development of nanoparticles (NPs) as a part of cancer therapeutics has given rise to a new field of research - cancer nanomedicine. In comparison to traditional anti-cancer drugs, NPs provide a targeted approach which prevents undesirable effects. In this communication, we have reviewed the role of gold and silver NPs (AgNPs) in the cancer nanomedicine. The preparation of gold NPs (AuNPs) and AgNPs can be grouped into three categories - physical, chemical and biological. Among the three approaches, the biological approach is growing and receiving more attention due to its safe and effective production. In this review, we have discussed important methods for synthesis of gold and AgNPs followed by techniques employed in characterization of their physicochemical properties, such as UV-visible spectroscopy, electron microscopy (TEM and SEM) and size and surface analysis (DLS). The mechanism of formation of these NPs in an aqueous medium through various stages - reduction, nucleation and growth has also been reviewed briefly. Finally, we conclude our review with the application of these NPs as anti-cancer agents and numerous mechanisms by which they render cancer cell toxicity.

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A Comparative Analysis of the Properties of Zinc Oxide (ZnO) Nanoparticles Synthesized by Hydrothermal and Sol-Gel Methods

Cited by 16 publications

References 11 publications

Green synthesis and characterization of zinc oxide nanoparticles using bashful (Mimosa pudica), leaf extract: a precursor for organic electronics applications

Green synthesis and characterization of zinc oxide nanoparticles using bashful (Mimosa pudica), leaf extract: a precursor for organic electronics applications

Antimicrobial Activity of Chemical, Thermal and Green Route-Derived Zinc Oxide Nanoparticles: A Comparative Analysis

Role of gold and silver nanoparticles in cancer nano-medicine

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