Papers by Author: Jun Ying Zhang

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Authors: Feng Pan, Jun Ying Zhang, Hai Ying Liu, Tian Min Wang, Wei Chang Hao
Abstract: Ag nano-particles were deposited on the surface of TiO2 self-assembled films by photo-reduction of Ag+ solution. SPM, XPS and UV-Vis spectrophotometer were employed to characterize the microstructure and photo-catalytic performance of the films. An obvious enhancement of photo-catalytic activity had been observed. Since rutile had a lower optical band gap than anatase, a higher photo-catalytic efficiency improvement of rutile than that of anatase was obtained under the help of Ag nano-particles, which acted as electron acceptors.
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Authors: Jun Ying Zhang, Zhong Tai Zhang, Zi Long Tang, Tian Min Wang
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Authors: Yi Du, Wei Chang Hao, Jun Ying Zhang, Tian Min Wang
Abstract: In this paper, nanostructure zinc oxide (ZnO) hexagonal rods arrays on ZnO granular films coated substrates were fabricated by a simple chemical solution method. The shapes and structures can be controlled by changing the reactants and experimental conditions. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometer (EDS), and fluorescence spectrum were used to characterize the structures and luminescent properties. The best reacting condition has been discussed. Urea was found playing an important role in forming rods. The granular films acting as the seed films were proved.
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Authors: Hai Ling Zhu, Jun Ying Zhang, Xiang Lan, Chun Zhi Li, Tian Min Wang, Bai Biao Huang
Abstract: The direct current (DC) reactive magnetron sputtering of a metal copper target in oxygen-argon mixed atmospheres to produce thin films of crystalline copper oxides was described. The sputtering pressure, sputtering power and oxygen flow rate were established in order to control the structures and properties of Cu2O films. The as-deposited Cu2O films with various crystal structures have high visible absorption and photo-catalytic activity under visible light irradiation. The photo-catalytic properties of Cu2O films are affected by not only the crystal structure but also the surface morphology.
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Authors: Wei Wei Zhang, Jun Ying Zhang, Hui Wan, Zi Yu Chen, Tian Min Wang
Abstract: Chromium-activated ZnGa2O4 nano-sized phosphor powder was prepared by the Sol-Gel technique using citric acid as chelator, and the microstructure and luminescent property were studied. The host ZnGa2O4 belongs to the spinel structure and the ZnGa2O4:Cr3+ phosphor powder exhibited bright red emission band. The excitation bands with peak of maximum height at about 250 nm, 410 nm and 560 nm were related to the charge transfer (CT) of Ga-O, 4A2-4T1 and 4A2-4T2 transitions of Cr3+, respectively. Different quenching concentrations of the CT state and intrinsic excitation were discovered originating from different energy transfer schemes. Meanwhile, with the increasing of the calcining temperature the PLE spectrum exhibited an obvious blue-shift which is attributed to the enhancement of the crystal field.
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Authors: Dao Qi Xue, Jun Ying Zhang, Hai Bing Feng, Tian Min Wang
Abstract: ZnO:Eu3+ films were obtained by dip-coating method and influence of heat treatment on luminescent properties was investigated. Emission and excitation spectra revealed that the organic and nitrate molecules, which adhered on the surface of films when the samples were treated at lower temperatures (300oC-400oC), played an important role on the luminescent properties. At higher temperatures (500oC-800oC), the luminescence spectra of ZnO and Eu3+ were quite different with those treated at lower temperatures. Energy transferred from ZnO host to Eu3+ was obviously observed in the emission and excitation spectra. The luminescence mechanism was discussed briefly.
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Authors: Wei Chang Hao, Jun Ying Zhang, Hai Bing Feng, Tian Min Wang
Abstract: Quantum size ZnO colloids were prepared by sol-gel method and size of colloids together with the luminescence properties were changed by varying preparing time and temperature. The absorption onset and the maximum of fluorescence peak of the ZnO colloid have obvious shift in UV region and visible light region respectively. The relationship between luminescence properties and energy level splitting is discussed in detail based on the experimental results.
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Authors: Jun Ying Zhang, Zi Long Tang, Zhong Tai Zhang, Fundong Lin, Yuan Hua Lin
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Authors: Chun Yang, Jun Ying Zhang, Hai Bing Feng, Wei Chang Hao, Tian Min Wang
Abstract: Y2O3:Eu3+ thin film was synthesized by sol-gel method with inorganic salt raw materials, and the crystal structure and luminescent properties were investigated. By adding organic additive to the sol, a homogeneous film with high luminescent intensity could be obtained by dip-coating technique on the surface of alumina sheet and quartz glass. Structures of the films were studied by XRD and SEM. The excitation spectra of the films showed a wide excitation peak from 200nm to 260nm, and the emission spectra had a strongest emission peak at 611nm which revealed a close relationship with the calcining temperature.
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