Ag-doped ZnO nanoellipsoids: Potential scaffold for photocatalytic and sensing applications

Kumar, Ramesh; Singh, Dalwinder; Umar, Ahmad; Sharma, Pankaj; Chauhan, Suvarcha; Chauhan, M. S.

doi:10.1016/j.talanta.2015.01.039

Cited by 78 publications

(35 citation statements)

References 66 publications

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“…Then CB electrons react with dissolved oxygen in the solution to produce superoxide radicals(.O − 2 ), while the valance band (VB) holes react with hydroxide ions for the production of hydroxyl radicals(.OH − ). Both of these radicals are responsible for the decolorization of MV dye 15,58 . Also, the energy barrier of the Ag-semiconductor junction prevented electron-hole recombination to separate photogenerated charges, effectively 47 .…”

Section: Ementioning

confidence: 99%

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Hosseini

Sarsari

Kameli

et al. 2015

Journal of Alloys and Compounds

271

126

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Silver-doped ZnO nanoparticles were successfully fabricated at 400• C via a simple and rapid method based on short time solid state milling and calcination of precursor powders. The effect of Ag dilute doping on the structural, optical, and photocatalytic properties of ZnO nanoparticles was investigated by X-ray diffraction (XRD), UV-vis spectrophotometer and photoluminescence (PL) spectroscopy. X-ray analysis revealed that Ag doped ZnO solidified in hexagonal wurtzite structure. The intensity of deep level emission was reduced with increasing silver doping in PL measurement. The X-ray photoelectron spectroscopy (XPS) measurement predicted that Ag was mainly in the metallic state and ZnO was in the wurtzite structure. This metallic state accompanied by unique zinc oxide properties decolorized the methyl violet, efficiently. The first-principles calculation represented Ag deep level in ZnO with an n-type behavior, while in ZnO structure with grain boundary p-type nature via shallow states is dominant same as powder samples as studied in this present work. It was suggested that these Ag-doped ZnO nanoparticles may have good applications in optoelectronics, spintronics and wastewater treatment.

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Section: Ementioning

confidence: 99%

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Hosseini

Sarsari

Kameli

et al. 2015

Journal of Alloys and Compounds

271

126

View full text Add to dashboard Cite

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“…Recently, the synthesis of nanostructured thin films based on zinc oxide has been intensively investigated. These nanostructures have been applied in lot of physics devices like light-emitting diodes [1], window materials in solar cells [2,3], gas sensors [4,5], and photocatalysts [6][7][8]. Moreover, the ZnO has a direct wide band gap energy (≈ 3.37 eV at room temperature) and a high excitonic binding energy (60 meV), which make it a suitable material for optoelectronics [9].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

et al. 2019

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Undoped and Ag-doped ZnO thin films with different silver concentrations (0, 1, 3, and 7 wt%) were synthesized by sol-gel method and deposited onto glass substrate by dip-coating technique. Zinc acetate dehydrate and silver nitrate were used as starting materials. 2-Methoxyethanol and ethanolamine were used as solvent and stabilizer. Characterization by X-ray diffraction has revealed that the undoped and Ag-doped ZnO are polycrystalline, and have the wurtzite hexagonal structure with a preferred orientation along c-axis. The nanometric size (27-34 nm) of ZnO crystallites varies with the concentration of Ag. The surface morphology analysis, by atomic force microscopy and scanning electron microscopy, depicts a homogeneous dispersion of ZnO crystallites in the form of randomly spread wrinkles-like formation. The Raman spectroscopy confirms the Ag incorporation in the ZnO lattice. All films exhibit a transmittance greater than 75% in the visible region, and a sharp absorption band at 325 nm corresponding to the fundamental absorption edge. The room-temperature photoluminescence spectra of the prepared thin films display a strong ultraviolet band at 380 nm originated from excitons recombination, and four bands in the visible region at 430 nm (violet), 460 nm, 480 nm (blue) and 530 nm (green) from created defect levels in the band gap. These synthesized materials may be potential candidates in the manufacture of devices using short wavelengths.

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“…NPs have been studied for many years because of their size-dependent physical and chemical properties. Among NPs, great attention has been shifted to nanooxides [5][6][7]. NPs have attracted great interest due to their special or specific properties and selectivity, especially in pharmaceutical and biological applications [8].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of Ag-Doped TiO₂ and Ag-Doped ZnO Nanoparticles

Nigussie

Tesfamariam

Tegegne

et al. 2018

International Journal of Photoenergy

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We report in this paper antibacterial activity of Ag-doped TiO2 and Ag-doped ZnO nanoparticles (NPs) under visible light irradiation synthesized by using a sol-gel method. Structural, morphological, and basic optical properties of these samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectrum, and UV-Vis reflectance. Room temperature X-ray diffraction analysis revealed that Ag-doped TiO2 has both rutile and anatase phases, but TiO2 NPs only have the anatase phase. In both ZnO and Ag-doped ZnO NPs, the hexagonal wurtzite structure was observed. The morphologies of TiO2 and ZnO were influenced by doping with Ag, as shown from the SEM images. EDX confirms that the samples are composed of Zn, Ti, Ag, and O elements. UV-Vis reflectance results show decreased band gap energy of Ag-doped TiO2 and Ag-doped ZnO NPs in comparison to that of TiO2 and ZnO. Pathogenic bacteria, such as Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli, were used to assess the antibacterial activity of the synthesized materials. The reduction in the viability of all the three bacteria to zero using Ag-doped ZnO occurred at 60 μg/mL of culture, while Ag-doped TiO2 showed zero viability at 80 μg/mL. Doping of Ag on ZnO and TiO2 plays a vital role in the increased antibacterial activity performance.

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Ag-doped ZnO nanoellipsoids: Potential scaffold for photocatalytic and sensing applications

Cited by 78 publications

References 66 publications

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

Antibacterial Activity of Ag-Doped TiO₂ and Ag-Doped ZnO Nanoparticles

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Ag-doped ZnO nanoellipsoids: Potential scaffold for photocatalytic and sensing applications

Cited by 78 publications

References 66 publications

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Effect of Ag doping on structural, optical, and photocatalytic properties of ZnO nanoparticles

Fabrication and Characterization of Highly Textured Thin Films of Undoped and Ag-Doped ZnO

Antibacterial Activity of Ag-Doped TiO2 and Ag-Doped ZnO Nanoparticles

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Product

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Antibacterial Activity of Ag-Doped TiO₂ and Ag-Doped ZnO Nanoparticles