Preparation, characterization, and photocatalytic performance of pear-shaped ZnO/Ag core–shell submicrospheres

Guo, Xiaohua; Ma, Jianqi; Ge, Hongguang

doi:10.1016/j.jpcs.2013.01.024

Cited by 27 publications

(12 citation statements)

References 27 publications

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“…39 It represents the radiative recombination between the electrons in the conduction band with the holes in the valence band or with closer defect levels. 41 The band around 465 nm is related to the singly ionised oxygen vacancies 42 Generally, these oxygen vacancies play a crucial role in the electrical property of ZnO thin films. 40 The weak peak around 450 nm is attributed to the zinc vacancy (V Zn ) defect level.…”

Section: Photoluminescence (Pl) Studiesmentioning

confidence: 99%

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Ravichandran¹,

Subha²,

Manivasaham³

et al. 2016

RSC Adv.

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A triple layer system (TaZO/Ag/TaZO) consists of tantalum doped zinc oxide (TaZO) as the top and bottom layers and metallic silver (Ag) as the intermediate layer was deposited onto glass substrates. The top and bottom layers were deposited using an inexpensive homemade Automated Jet Nebulizer Spray Technique (AJNSP) and the intermediate Ag layer was deposited using thermal evaporation technique. Three different sets of samples with top and bottom layers having thickness values around 50, 75 and 100 nm were prepared keeping the thickness of the middle layer constant (15 nm). The influence of thickness on structural,electrical, optical and photoluminescence properties along with surface morphology of the deposited triple layer system was studied. Structural study revealed that the deposited films have hexagonal wurzite structure of ZnO and x-ray photoelectron spectroscopic study confirms the presence of the expected elements in the system. Optical studies show that the overall thickness of the films influences only marginally the transmittance of the films. The decrease in sheet resistance with the increase in thickness is explained on the basis of grain boundary scattering mechanism. Among all the films examined, the multi-layer film with 75+15+75 nm thickness exhibits best quality factor (8.98 × 10 -3 (Ω/sq.) -1 ), which may be considered as a potential candidate for transparent electrode applications. To the best of our knowledge, this is the first report in which a low cost chemical technique is employed to fabricate a triple layered system. ________________________________________________________________________________________________________________

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Section: Photoluminescence (Pl) Studiesmentioning

confidence: 99%

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Ravichandran¹,

Subha²,

Manivasaham³

et al. 2016

RSC Adv.

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“…The ZnO nanostructures show a strong absorption at 355 nm. Hence, there is a blue shift of 29 nm relative to the bulk ZnO due to quantum confinement effect [33]. In the case of the nanocomposites, it is evident that not only the absorption efficiency in the visible range was gradually enhanced with increasing mole fraction of silver iodide, but also the absorption edge was red shifted, leading to absorb more photons from the visible range to produce more electron-hole pairs.…”

Section: Resultsmentioning

confidence: 95%

Microwave-assisted one-pot method for preparation of ZnO/AgI nanocomposites with highly enhanced photocatalytic activity under visible-light irradiation

Shaker-Agjekandy

Habibi‐Yangjeh

2016

Desalination and Water Treatment

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A B S T R A C TIn the present work, a microwave-assisted one-pot method was applied for preparation of the ZnO/AgI nanocomposites. One-pot, large-scale, and short preparation time are main advantages of this method. Photocatalytic activity of the nanocomposites in degradation of rhodamine B under visible-light irradiation is remarkably depended on mole fraction of AgI and the superior activity was seen for the nanocomposite with 0.342 mol fraction of silver iodide. The degradation rate constant over this nanocomposite is about 10-fold higher than that of the ZnO nanostructures. Photoluminescence spectra confirmed that separation of the charge carriers in the nanocomposites is more intensive than the ZnO nanostructures. Furthermore, it was observed that the microwave irradiation time, calcination temperature, and scavengers of the reactive species have considerable influence on the degradation reaction. More importantly, the photocatalyst retains about 80% of its activity after using for five cycles.

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“…Among many noble metals, Ag is the cheapest noble metal and has potentials in industrial productions. Therefore, a series of ZnO/Ag nanocomposites with different morphologies have been prepared through various methods [18][19][20][21][22][23][24][25]. However, the design and preparation of photocatalysts with superior performance are still required.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hexagonal‐like ZnO/Ag composite with excellent photocatalytic activity

Wang

Cai

Guo

et al. 2019

Micro & Nano Letters

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Hexagonal-like zinc oxide (ZnO)/silver (Ag) composite was successfully synthesised by a flux/solvothermal route, and Ag nanoparticles are loaded on ZnO. Compared with pure ZnO, the attachment of Ag on ZnO can significantly increase visible-light absorption and reduce photoluminescence emission intensity. The photocatalytic performance of ZnO/Ag composite was evaluated by the degradation of Rhodamine B solution under ultraviolet (UV) light and visible light irradiation. The degradation rate of ZnO/Ag composite is obviously improved compared with pure ZnO and the commercial TiO 2 (P25) and is more than 2.5 and 2.9 times faster than that of pure ZnO under the UV and visible light irradiation, respectively. The enhanced photocatalytic activity of ZnO/Ag composite under UV irradiation was ascribed to the formation of Schottky barriers between Ag particles and ZnO. However, the superior photocatalytic activity under visible light irradiation could be attributed to the surface plasmon resonance of Ag particles.

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Preparation, characterization, and photocatalytic performance of pear-shaped ZnO/Ag core–shell submicrospheres

Cited by 27 publications

References 27 publications

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Fabrication of a novel low-cost triple layer system (TaZO/Ag/TaZO) with an enhanced quality factor for transparent electrode applications

Microwave-assisted one-pot method for preparation of ZnO/AgI nanocomposites with highly enhanced photocatalytic activity under visible-light irradiation

Synthesis of hexagonal‐like ZnO/Ag composite with excellent photocatalytic activity

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