Formation kinetics and structures of high-density vertical Si nanowires on (111)Si substrates

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题名:	Formation kinetics and structures of high-density vertical Si nanowires on (111)Si substrates
作者:	Cheng,SL;Chung,CH;Chang,YH
贡献者:	化學工程與材料工程學系
关键词:	SILICON NANOWIRES;GROWTH;FABRICATION;ARRAYS;REDUCTION;SURFACES
日期:	2009
上传时间:	2010-06-29 17:27:02 (UTC+8)
出版者:	中央大學
摘要:	We report here the first study of formation kinetics of high-density vertical Si nanowire arrays formed on (111)Si substrates in aqueous AgNO3/HF etching solutions. From TEM and electron diffraction analyses, the as-prepared Si nanowires were determined to be perfectly single crystals and the axial orientation of the Si nanowires was identified to be parallel to the [111] direction, which was identical to the orientation of the (111)Si wafers used. The typical widths of the Si nanowires prepared are in the range of 25-150 nm. The lengths of the Si nanowires were found to increase linearly with the reaction time in samples treated at 5-30 degrees C. By measuring the growth rate at different temperatures, the activation energy for the linear formation of Si nanowire arrays on blank-(111)Si was obtained from an Arrhenius plot to be about 0.38 eV. The results of the contact angle measurements further indicated that the hydrophobicity of the Si samples was enhanced significantly by the formation of Si nanowire arrays. The hydrophobic behavior of the HF-treated Si nanowire arrays could he explained by Cassie's model.
關聯:	JOURNAL OF CERAMIC PROCESSING RESEARCH
显示于类别:	[化學工程與材料工程研究所] 期刊論文

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