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Liu J.,Wuhan University of Technology | Liu J.,Zhoukou Normal University | Zhang G.,Wuhan University of Technology
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2015

Micro/nanostructured Ag2ZnGeO4 hollow spheres were successfully synthesized by a one-step and low-temperature route under ambient pressure. The micro/nanostructured Ag2ZnGeO4 hollow spheres have a diameter of 1-2 μm and their shells are composed of numerous nanoparticles and nanorods. The growth process of the micro/nanostructured Ag2ZnGeO4 hollow spheres was investigated in detail. The results indicated that the morphologies and composition of Ag2ZnGeO4 samples were strongly dependent on the dose of the AgNO3 and reaction time. Excessive AgNO3 was favorable for the nucleation and growth rate of Ag2ZnGeO4 crystals and the formation of pure Ag2ZnGeO4. Moreover, the formation mechanism of the micro/nanostructured Ag2ZnGeO4 hollow spheres is related to the Ostwald ripening. Under the same conditions, the photocatalytic activity of micro/nanostructured Ag2ZnGeO4 hollow spheres is about 1.7 times and 11 times higher than that of bulk Ag2ZnGeO4 and Degussa P25, respectively. These interesting findings could provide new insight on the synthesis of micro/nanostructured ternary-metal oxides with enhanced photocatalytic activity.


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.


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.


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.


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.


Zhou X.,Zhoukou Normal University
2011 International Conference on Electrical and Control Engineering, ICECE 2011 - Proceedings | Year: 2011

At present, network collaborative learning based on the Blog and Blog group becomes a new research hotspot. In the foundation of make clear the connotation of network collaborative learning, this essay elaborates theoretical basis, learning mode, learning process, its advantages and disadvantages of network collaborative learning based on the Blog and Blog group, and introduces briefly its application in the field of education. © 2011 IEEE.


Zhou W.,Zhoukou Normal University
Journal of Computational and Theoretical Nanoscience | Year: 2016

DS-CDMA communication system is interference limited system. With the impact of multiple access interference and the far-near effect of the system performance, the capacity of the system decreased significantly. In order to solve this problem, Multi user detection is researched in this paper. It is considered as a kind of useful information, which can eliminate the multiple access interference, and can reduce the effect of the far-near effect, improve the system performance and improve the capacity of the system. The optimization design method is used to study the implementation for multi user detector and adaptive minimum bit error rate of the multi user detector in synchronous DS-CDMA downlink. The author puts forward the principles of optimizing design of chaotic spread spectrum sequences, with minimum bit error rate multiuser detector as a platform to optimize the chaotic spread spectrum sequences. The experiment result shows that the multi user detector can improve the accuracy and response speed of the chaos-based DS-CDMA system. Copyright © 2016 American Scientific Publishers. All rights reserved.


Zhou W.,Zhoukou Normal University
Journal of Computational and Theoretical Nanoscience | Year: 2016

With the arrival of cloud platform and era of big data, study on data mining algorithm is of great significance. This paper applies fuzzy theory into neural network, which improves the insufficiency of the application of neural network in data mining. Establishing neural network can obtain the knowledge interested and extract effective rules in the database. © 2016 American Scientific Publishers All rights reserved.


Tian B.-S.,Nanjing Normal University | Tian B.-S.,Zhoukou Normal University | Yang C.,Nanjing Normal University
Journal of Nanoscience and Nanotechnology | Year: 2011

Thermo-sensitive nanocomposites based on mesoporous silica SBA-15 and poly(N-isopropyl-acrylamide) (PNIPAAm) have been synthesized via in situ radical polymerization in mesopores. The resultant materials were used as carriers to construct temperature-responsive controlled drug delivery systems. Loading of model drug ibuprofen (IBU) was ascertained by IR and UV-vis/DRS spectroscopy, and the mesostructure and pore properties of the delivery system were characterized by small-angle XRD and N 2 adsorption-desorption experiment. Study on drug uptake indicated that higher polymer content in the composite, higher IBU concentration in loading solution and lower loading temperature below the lower critical solution temperature (LCST) could increase the loading amount of IBU by means of interaction between IBU and polymer and trap effect of the polymer chains in pores. Different from the uptake of IBU, however, the release of drug followed a positive temperature-responsive manner, that is, the release was accelerated upon heating above the LCST, while decelerated and lasted for a longer period of time below the LCST. This feature allows the material to function as a reversible fast/slow transition switch or rate regulator responsive to environmental temperature and to be potentially interesting in controlled delivery and other smart application fields. © 2011 American Scientific Publishers.


Li Z.,Zhoukou Normal University
Chemistry Letters | Year: 2015

Hybrid organic/inorganic perovskite solar cells have been rapidly developed with spectacular success in both nanostructured and thin-film versions. Herein, we report a simple solvothermal method using WCl6 and NH3·H2O as precursors in ethanol solvent at 200 ° C for 24 h to fabricate WO3 nanocrystals (NCs) as the hole transport layer in an inverted perovskite solar cell. The thin WO3 NC film with a smooth and compact surface enabled the formation of a continuous and compact layer of well-crystallized CH3 NH3 PbI3 in a two-step solution process. A cell efficiency of 7.68% was obtained, which is a promising planar perovskite solar cell based on an inorganichole extraction layer. © 2015 The Chemical Society of Japan.

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