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Zhoukou, China

Li Z.,Zhoukou Normal University
Microelectronics International | Year: 2016

Purpose-The purpose of this paper is to seek a surfactant or template-free, simple and green method to fabricate NiO nanobelts and to find an effective technique to detect the ethanol vapor at room temperature. Design/methodology/approach-NiO nanobelts with high aspect ratio and dispersive distribution have been synthesized by a template-free hydrothermal reaction at 160°C for 12 h. The products are studied by X-ray diffraction (XRD), energy dispersive spectroscopY, scanning electron microscopy, atomic force microscopy, high-resolution transmission electron microscopy, selective area electron diffractio and X-ray photoelectron spectroscopy. In particular, the room-temperature ethanol sensitivity of NiO nanobelts is investigated by the surface photo voltage (SPV) technique. Findings-The prepared NiO nanobelts is single crystalline bunsenite structure with the length of approximately 10m and the diameter of approximately 30 nm. The atomic ratio of "Ni" to "O" is 0.92:1. When the concentration of ethanol vapor reaches 100 ppm, the sensitivity of NiO nanobelts is 7, which can meet the commercial demanding of ethanol gas sensor. Originality/value-The NiO nanobelts can be obtained by a template-free, simple and green hydrothermal reaction at 160°C for 12 h. The NiO nanobelts-based gas sensor is a promising candidate for the application in ethanol monitoring at room temperature by SPV technique. © Emerald Group Publishing Limited. Source

Han J.-Z.,Zhoukou Normal University | Li B.-Z.,Xinyang Normal University
Communications in Theoretical Physics | Year: 2013

In the context of the left-right twin Higgs (LRTH) model, we have studied the charged Higgs bosons production processes e+ e- (γγ) → tb̄φ- at the International Linear Collider (ILC). It is found that the cross sections of these two processes could reach a few fb with reasonable parameter values. With the yearly integrated luminosity of C =500 fb-1 expected at the ILC, one could collect hundreds up to thousands of charged Higgs events via these two processes. Therefore, our researches in this paper can help us search for charged Higgs bosons, and furthermore, to test the LRTH model. © 2013 Chinese Physical Society and IOP Publishing Ltd. Source

Tian Y.,Zhoukou Normal University | Zhang L.,CAS Hefei Institutes of Physical Science | Zhang J.,CAS Hefei Institutes of Physical Science
Journal of Alloys and Compounds | Year: 2012

Novel visible light-driven photocatalyst europium-doped bismuth tungstate (Eu/Bi 2WO 6) hierarchical microspheres has been synthesized by a hydrothermal route. The obtained products were characterized by SEM, EDX, XRD, XPS and DRS technologies. Their photocatalytic activities were determined by oxidative decomposition of Rhodamine-B (RhB) in aqueous solution under visible light irradiation. The results revealed that the europium doping greatly improved the photocatalytic efficiency of Bi 2WO 6 microspheres. The photodegradation reactions of RhB by Eu/Bi 2WO 6 composites followed the first-order kinetics. The possible reasons for Eu/Bi 2WO 6 composites showing higher activity than pure Bi 2WO 6 are mainly ascribed to the enhanced absorption in the visible region and the suppressed recombination between photogenerated electrons and holes in composite samples. © 2012 Elsevier B.V. All rights reserved. Source

Wang Z.-L.,Hong Kong Polytechnic University | Wang Z.-L.,Zhoukou Normal University | Hao J.,Hong Kong Polytechnic University | Chan H.L.W.,Hong Kong Polytechnic University | And 2 more authors.
Small | Year: 2012

Hexagonal-phase NaYF4:Yb3+,Er3+ up-conversion nanocrystals (UCNCs) are synthesized by a combination of refluxing and hydrothermal treatment. This strategy leads to only a slight increase in particle size, from 4.5 to ca. 10 nm, during the cubic-to-hexagonal phase transition. The hexagonal UCNCs can be internalized by HeLa cells and exhibit visible emission in the cells under near-infrared excitation. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Tian F.,Zhoukou Normal University | Liu Y.,Hunan University
Scripta Materialia | Year: 2013

The successful fabrication of p-type nickel oxide (NiO)/n-type zinc oxide (ZnO) heterostructures was achieved by growing NiO nanoparticles on ZnO hierarchical structures. Flower-like ZnO was developed by chemical bath deposition and used as a support to grow cubic NiO particles. The photocatalytic activity of the as-obtained heterostructures for the degradation of methyl orange was much higher than that of pure NiO, ZnO and their physical mixture, which could be ascribed to the formation of p-n heterojunctions. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Source

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