Controllable growth of ZnO–ZnSe heterostructures for visible-light photocatalysis

Chen, W.; Zhang, N.; Zhang, M. Y.; Zhang, X. T.; Gao, Hong; Wen, Jing

doi:10.1039/c3ce42068j

Cited by 48 publications

(17 citation statements)

References 32 publications

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“…The above analysis confirms that the as-synthesized ZnS has the structure of alternating WZ/ZB stackings, which may provide the possibility of its application in charge-separation areas, other than the pre-mentioned areas, since WZ ZnS and ZB ZnS form a staggered type-II band alignment. 21,38,39 …”

Section: Resultsmentioning

confidence: 99%

Epitaxial growth of wafer-scale two-dimensional polytypic ZnS thin films on ZnO substrates

Wang

Xiong

et al. 2017

CrystEngComm

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In this paper, we report the first successful epitaxial synthesis of flat wafer-scale two-dimensional ZnS thin films on single- file at the interfaces were studied in detail. After a simple etching treatment, exfoliated large-area free-standing ZnS thin films were achieved for the first time. The present product is expected to become valuable to the strategy of growing large-area thin films or heterostructures with a large lattice mismatch.

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Section: Resultsmentioning

confidence: 99%

Epitaxial growth of wafer-scale two-dimensional polytypic ZnS thin films on ZnO substrates

Wang

Xiong

et al. 2017

CrystEngComm

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“…The conduction band levels of ZnO and ZnSe are at−0.15 and−0.41 eV whereas, the valence band energy levels are at 3.05 and 2.2 eV, respectively. The valence band (VB) of ZnO is more positive than VB of ZnSe almost by 0.85 eV . Upon illumination with 350 nm wavelength, the electrons present in the VB of ZnO and ZnSe get excited to respective conduction band (CB), there could be two probabilities for electron‐hole pair recombinations.…”

Section: Resultsmentioning

confidence: 99%

“…ZnO‐based nanostructures attracted increasing interest, because the properties of ZnO‐based nanostructures can be tailored by changing the morphology, structure and size, or modifying surface with coatings of other materials. Considerable efforts have been devoted for synthesis of ZnO nanostructures including nanorods, nanobelts, nanodisks, nanowires and hierarchical structures [24] etc. Moreover, it is reported that one dimensional nanostructures improve the charge carrier mobility which in turn helps to minimize the electron–hole recombination leading to the higher photocatalytic activity .…”

Section: Introductionmentioning

confidence: 99%

ZnSe/ZnO Nano-Heterostructures for Enhanced Solar Light Hydrogen Generation

et al. 2017

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The one dimensional Zinc Selenide/Zinc Oxide (ZnSe/ZnO) nano‐heterostructures were prepared using solvo/hydrothermal reaction technique with varying concentration of ZnSe. The prepared nano‐heterostructures were characterized with various techniques. X‐ Ray Diffraction (XRD) indicates the formation of cubic ZnSe and hexagonal phase of ZnO. Field Emission Scanning Electron Microscopy (FESEM) depicts the formation of rod shaped ZnO nanostructures decorated with spherical nanoparticles of ZnSe. Field Emission Transmission Electron Microscopy (FETEM) validates the formation ZnO nanorods of size 30–40 nm along with spherical ZnSe (25‐30 nm) nanostructures. The UV‐Visible absorption spectra analysis clearly depicts the extended absorbance in the visible region. Photoluminescence study indicates the sharp band edge emission peak at 390 nm and broad peak at 475 nm. With further increase in ZnSe concentration, the intensity of band edge emission peak decreases due to the vacancy defects. The photocatalytic performance of prepared ZnSe/ZnO nano‐heterostructure was evaluated by studying the hydrogen (H2) generation via water (H2O) splitting under UV‐Visible light. The ZnSe/ZnO (10:90 weight ratio) shows 491 μmol of H2 generation after 4 hours irradiation. With increase in amount of ZnSe upto 10 mol%, the H2 evolution was also enhanced due to narrowing of the band gap and suppression of recombination rate of charge carriers.

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“…Specifically, heterojunction of a ZnO/ZnS double layer can convert UV light into conducting carriers capable of detecting UV photons. Toward this goal, coreshell heterostructures such as ZnO-TiO 2 [2], ZnO-SnO 2 [3], ZnO-ZnSe [4], and ZnO-ZnS [5] have been successfully constructed in the past. In addition, 1D ZnO/ZnS nanostructures can facilitate the rapid transfer of photogenerated electron-hole pairs [6,7].…”

Section: Introductionmentioning

confidence: 99%

Morphological, Material, and Optical Properties of ZnO/ZnS/CNTs Nanocomposites on SiO2 Substrate

et al. 2020

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Ultraviolet A light (UV-A, 320–400 nm), which is unblockable by sunscreen, requires careful detection for disease avoidance. In this study, we propose a novel photosensing device capable of detecting UV-A. Cancer-causing UV light can be simultaneously monitored with tiny rapid response sensors for a high carrier transition speed. In our research, a multifunctional ZnO/ZnS nanomaterial hybrid-sprinkled carbon nanotube (CNT) was created for the purpose of fabricating a multipurpose, semiconductorbased application. For our research, ZnO nanorods (NRs) were grown by using a facile hydrothermal method on SiO2 substrate, then vulcanized to form ZnO/ZnS coreshell nanorods, which were sprinkled with carbon nanotubes (CNTs). Results indicate that SiO2/ZnO/ZnS/CNT structures exhibited a stronger conducting current with and without light than those samples without CNTs. Multiple material characterizations of the nanostructures, including of atomic force microscopy (AFM) surface morphology evaluation, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) indicate that CNTs could be successfully spread on top of the ZnO/ZnS coreshell structures. Furthermore, chemical binding properties, material crystallinity, and optical properties were examined by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and photoluminescence (PL). Owing to their compact size, simple fabrication, and low cost, ZnO/ZnS coreshell NRs/CNT/SiO2-based nanocomposites are promising for future industrial optoelectronic applications.

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Controllable growth of ZnO–ZnSe heterostructures for visible-light photocatalysis

Abstract: ZnO–ZnSe heterostructures for visible-light photocatalysis are fabricated via a two-step CVD process.

Cited by 48 publications

References 32 publications

Epitaxial growth of wafer-scale two-dimensional polytypic ZnS thin films on ZnO substrates

Epitaxial growth of wafer-scale two-dimensional polytypic ZnS thin films on ZnO substrates

ZnSe/ZnO Nano-Heterostructures for Enhanced Solar Light Hydrogen Generation

Morphological, Material, and Optical Properties of ZnO/ZnS/CNTs Nanocomposites on SiO2 Substrate

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