Rapid Synthesis of Bundled Tungsten Oxide Nanowires by Microwave Plasma-Enhanced Chemical Vapor Deposition and Their Optical Properties

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Title:	Rapid Synthesis of Bundled Tungsten Oxide Nanowires by Microwave Plasma-Enhanced Chemical Vapor Deposition and Their Optical Properties
Authors:	Hsieh, YT (Hsieh, Yun-Tsung) Hsueh, SH (Hsueh, Sen-Hong) Chen, US (Chen, Uei-Shin) Huang, MW (Huang, Meng-Wen) Shih, HC (Shih, Han C.)
Contributors:	化材所
Keywords:	FIELD-EMISSION PROPERTIES LOW-TEMPERATURE NANOTUBES ARRAYS ULTRAVIOLET NANORODS
Date:	2010
Issue Date:	2011-12-15 15:47:36 (UTC+8)
Abstract:	In recent years, the synthesis of one-dimensional nanomaterials has assumed considerable importance because of the potential applications of these nanomaterials especially in nanodevices. In this study, bundled tungsten oxide (W(18)O(49)) nanowires having diameters of 25-60 nm and lengths of several micrometers were fabricated on Si substrates within 1.5 min by microwave plasma-enhanced chemical vapor deposition (MPECVD). The crystal structure, morphology, and chemical composition of these nanowires were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and cathodoluminescence (CL) spectrometry. The growth of the W(18)O(49) nanowires occurred along the [010] plane. Because no catalysts were used, it was suggested, and then analytically confirmed, that the vapor-solid mechanism was suggested for this growth process; this has been confirmed analytically. An orange emission was observed in the CL spectra, suggesting that the W(18)O(49) nanowires exhibited a redshift, resulting from the presence of significant O deficiencies. In this manner, our overall results demonstrate that MPECVD is a highly effective and suitable method for the fabrication of W(18)O(49) nanowires. (C) 2010 The Electrochemical Society. [DOI:10.1149/1.3459906] All rights reserved.
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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