In-situ observation of hydrothermal growth of ZnO nanowires on patterned Zn substrate and their photocatalytic performance

Liu, Xinmei; Huang, Wenyi; Cheng, Hao; Bang-biao, Huang; Bai, Dawei; Fu, Fengming; Wu, Hongda; Li, Lijun

doi:10.1016/j.apsusc.2015.08.075

Cited by 17 publications

(9 citation statements)

References 38 publications

(38 reference statements)

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“…( b ) 45° side-view SEM image of hexagonally ordered ZnO nanorod grown by VLS method on patterned Au-covered substrates. ( c ) Schematic representation of the growth of nanowires by the hydrothermal technique [ 60 ]. Copyright 2015 Elsevier.…”

Section: Zno Structure and Main Growth Techniquesmentioning

confidence: 99%

Photoluminescence of ZnO Nanowires: A Review

et al. 2020

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One-dimensional ZnO nanostructures (nanowires/nanorods) are attractive materials for applications such as gas sensors, biosensors, solar cells, and photocatalysts. This is due to the relatively easy production process of these kinds of nanostructures with excellent charge carrier transport properties and high crystalline quality. In this work, we review the photoluminescence (PL) properties of single and collective ZnO nanowires and nanorods. As different growth techniques were obtained for the presented samples, a brief review of two popular growth methods, vapor-liquid-solid (VLS) and hydrothermal, is shown. Then, a discussion of the emission process and characteristics of the near-band edge excitonic emission (NBE) and deep-level emission (DLE) bands is presented. Their respective contribution to the total emission of the nanostructure is discussed using the spatial information distribution obtained by scanning transmission electron microscopy−cathodoluminescence (STEM-CL) measurements. Also, the influence of surface effects on the photoluminescence of ZnO nanowires, as well as the temperature dependence, is briefly discussed for both ultraviolet and visible emissions. Finally, we present a discussion of the size reduction effects of the two main photoluminescent bands of ZnO. For a wide emission (near ultra-violet and visible), which has sometimes been attributed to different origins, we present a summary of the different native point defects or trap centers in ZnO as a cause for the different deep-level emission bands.

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Section: Zno Structure and Main Growth Techniquesmentioning

confidence: 99%

Photoluminescence of ZnO Nanowires: A Review

et al. 2020

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“…ZnO nanowires were extensively investigated in the photo-degradation of MO. Liu et al [196] synthesized ZnO nanowires and directly applied them to MO photo-degradation. A high photo-catalytic activity and stability for MO degradation was obtained and was ascribed to the increased defects of ZnO nanowires.…”

Section: Photo-degradation Of Methyl Orange (Mo)mentioning

confidence: 99%

“…[196] ZnO Nanorods The higher aspect ratio and larger specific surface area will enhance light photon capture efficiency, promote the generation of photo-induced charges and accelerate their transferrate. [197] ZnO Nanorod arrays…”

Section: Znomentioning

confidence: 99%

The Applications of Morphology Controlled ZnO in Catalysis

et al. 2016

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Zinc oxide (ZnO), with the unique chemical and physical properties of high chemical stability, broad radiation absorption range, high electrochemical coupling coefficient, and high photo-stability, is an attractive multifunctional material which has promoted great interest in many fields. What is more, its properties can be tuned by controllable synthesized morphologies. Therefore, after the success of the abundant morphology controllable synthesis, both the morphology-dependent ZnO properties and their related applications have been extensively investigated. This review concentrates on the properties of morphology-dependent ZnO and their applications in catalysis, mainly involved reactions on green energy and environmental issues, such as CO 2 hydrogenation to fuels, methanol steam reforming to generate H 2 , bio-diesel production, pollutant photo-degradation, etc. The impressive catalytic properties of ZnO are associated with morphology tuned specific microstructures, defects or abilities of electron transportation, etc. The main morphology-dependent promotion mechanisms are discussed and summarized.

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“…When the nanowires diameter is less than the critical value (about 50 nm) the ZnO effective band gap will increase as the redox potential there and the photogenerated charge carriers will possess higher reducing /oxidizing capabilities. The recombination of photogenerated charge carriers will be deterred with higher band gap, which will increase the catalytic performances [151].…”

Section: Synthetic Methods Of Zno Nanostructure For Photocatalytic Comentioning

confidence: 99%