Hydrothermal synthesis and optical properties of hexagonal tungsten oxide nanocrystals assisted by ammonium tartrate

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	Hydrothermal synthesis and optical properties of hexagonal tungsten oxide nanocrystals assisted by ammonium tartrate
	H. F. Pang; X. Xiang; Z. J. Li; Y. Q. Fu; X. T. Zu
	2012
发表期刊	Physica Status Solidi a-Applications and Materials Science
ISSN	1862-6300
卷号	209 期号:3 页码:537-544
摘要	Crystals of hexagonal tungsten oxides (hex-WO3) have been synthesized using hydrothermal method at 150 degrees C, assisted by the capping reagent of ammonium tartrate (AT). The XRD and EDX results reveal that the lattice distortion exists in all the samples, possibly due to the defects and the intercalation of the residual sodium ions. Different crystal shapes including plate-like, urchin-like, and particle structures were obtained by varying concentration of AT and pH values in the precursor solution. Beside the absorption action of the NH4+ and Na+ ions, the capping effect can be reinforced by the hydrogen bonding from the tartrate groups in the crystallization process. The bandgap energies were modulated by the size of the nanostructured hex-WO3 crystals due to quantum confinement effect, which increases from 2.74 to 3.04 eV. Based on the analysis of the photoluminescence and X-ray photoelectron spectroscopy, the enhancement of the blue emission of the nanocrystals is assigned as a result of a complex of the local intercalation of the residual sodium ions and the oxygen vacancies or defects. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
部门归属	[pang, hua-feng; xiang, xia; li, zhi-jie; zu, xiao-tao] univ elect sci & technol china, dept appl phys, chengdu 610054, peoples r china. [xiang, xia; zu, xiao-tao] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china. [fu, yong-qing] univ w scotland, scottish univ phys alliance supa, thin film ctr, paisley pa1 2be, renfrew, scotland.;xiang, x (reprint author), univ elect sci & technol china, dept appl phys, chengdu 610054, peoples r china.;xiaxiang@uestc.edu.cn; xtzu@uestc.edu.cn
关键词	Hydrothermal Synthesis Nanocrystals Photoluminescence Tungsten Oxides Large-scale Synthesis Polycrystalline Wo3 Thin-films Sol-gel Nanowires Nanorods Nanostructures Fabrication Deposition Oxidation
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60181
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. F. Pang,X. Xiang,Z. J. Li,et al. Hydrothermal synthesis and optical properties of hexagonal tungsten oxide nanocrystals assisted by ammonium tartrate[J]. Physica Status Solidi a-Applications and Materials Science,2012,209(3):537-544.
APA	H. F. Pang,X. Xiang,Z. J. Li,Y. Q. Fu,&X. T. Zu.(2012).Hydrothermal synthesis and optical properties of hexagonal tungsten oxide nanocrystals assisted by ammonium tartrate.Physica Status Solidi a-Applications and Materials Science,209(3),537-544.
MLA	H. F. Pang,et al."Hydrothermal synthesis and optical properties of hexagonal tungsten oxide nanocrystals assisted by ammonium tartrate".Physica Status Solidi a-Applications and Materials Science 209.3(2012):537-544.