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Your search keyword '"Zhang, Zhi-Yong"' showing total 36 results
Start Over Author "Zhang, Zhi-Yong" Journal advanced materials research
36 results on '"Zhang, Zhi-Yong"'

33. Synthesis, Photoluminescence and Infrared Emissivity of SnO2 Nanocrystalline Thin Films

Author

Yan, Jun Feng, Zhang, Feng Jiao, Ruan, Xiong Fei, Xu, Man Zhang, Zhang, Zhi Yong, Zhao, Wu, and Yun, Jiang Ni

Abstract

SnO2 nanocrystalline thin films (NCTFs) with high quality and low infrared emissivity were synthesized through a simple hydrothermal process designed by orthogonal design theory. The microstructure, morphology, photoluminescence (PL) property and the infrared emissivity (IRE) property of as-prepared products were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), fluorescence spectrophotometer, and infrared spectroradio meter (ISM) respectively. The results show that two emission peaks are observed in PL spectra, which can be deconvoluted by Gaussian profile fitting into four emission peaks centered at about 380, 420, 460 and 520 nm respectively. The influences of crystallinity, concentration of particles and resistivity on IRE were systematically investigated, revealing that the better crystallinity, higher particle density and better conductivity are favorable for lowering IRE.

Published
2015
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34. First-Principle Study on the Photocatalystic Properties of Tungsten Doped Monoclinic BiVO4 Crystallites

Author

Xi, Ying, Jiang, Hai Qing, Jin, Bo, Shi, Jian Zhang, Lei, Tian Ming, and Zhang, Zhi Yong

Abstract

In this paper, the photocatalytic properties of W-doped monoclinic BiVO4 were studied by CASTEP of MS-5.5 software under PWPP based on density function theory (DFT). The results showed that the band gap narrowed and the absorption edge red shifted after 5d atomic orbit of W mixing into the valence band of BiVO4 crystallites, which could effectively improve the photocatalytic activity of BiVO4 crystallites. The calculated results also implied that the photocatalytic properties of monoclinic BiVO4 crystallites could be improved by doping the transition metal with 5d4 orbital.

Published
2013
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35. FE-Based Analysis of Heat Bending of Thin-Walled Ti-Alloy Tube with Large Diameter and Small Bending Radius

Author

Li, Heng, Yang, He, Wang, Dan, and Zhang, Zhi Yong

Abstract

The numerical control (NC) heat bending of thin-walled Ti-alloy tube with large diameter and small bending radius with Ф50×1×R75mm (diameter OD bending radius CLR) is explored by 3D-FE thermal-mechanical coupling simulation of heat conducting and NC bending. The results show that: (1) The heating of both pressure die and mandrel is proved to be appropriate to obtain the required temperature field. (2) In terms of wall thickness variation, wrinkling and cross-section deformation, the optimum span of the key parameters are obtained: the bending velocity of 0.4rad/s, the matched pressure die speed of 80%-110%, and temperature of 600-800oC.

Published
2012
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36. Synthesis and Luminescent Properties of Eu3+ Doped Double Molybdate Phosphors

Author

Zhang, Zhi Yong, Yang, Yong, and Li, Wei

Abstract

A series of trivalent europium (Eu3+) doped double molybdate phosphors (MLa(MoO4)2, M = Li, Na, K) have been prepared via traditional solid state reaction method at 500-800 ºC. Their crystal structures and luminescent properties have been investigated, finding that the phosphors take on single phase through X-ray diffraction patterns (XRD) sintered at 600, 700 and 800 ºC for lithium, soldium and potassium salt, respectively.Their excited spectra consist of a broad band and three absorptions, in which the higher peaks locate at 400 nm and 470 nm in the region of 350-500 nm. Excited with 470 nm, the emission spectra are composed of four narrow bands and the strongest emission peak is located at 615 nm. The appropriate doping concentration of Eu3+ was 10 mol% for the 615 nm emission. The results indicate that this Eu3+ activated NaLa(MoO4)2 phosphors are promising yellowish red phosphor for ultraviolet (UV) and blue InGaN-based white LED.

Published
2011
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