Spatially Sequential Growth of Various WSi2 Networked Nanostructures and Mechanisms

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• 作者：Mohammad Norouzi Banis ; Xiangbo Meng ; Yong Zhang ; Mei Cai ; Ruying Li ; Xueliang Sun
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：September 19, 2013
• 年：2013
• 卷：117
• 期：37
• 页码：19189-19194
• 全文大小：356K
• 年卷期：v.117,no.37(September 19, 2013)
• ISSN：1932-7455

文摘

Various WSi₂ nanostructures including networked nanorods (NNWs), networked nanoribbons (NNRs), and nanosheets (NSs) were sequentially (spatial) synthesized in a controlled manner via a single-step chemical vapor deposition method. Their morphology, structure, and composition were characterized by scanning and transmission electron microscopes and X-ray diffraction. The nanostructures are 6鈥?0 nm in thickness and several micrometers in length. The results reveal that the formation of WSi₂ nanostructures is governed by a vapor solid mechanism and the concentration of reactive species plays a crucial role in controlling the formation of the various morphologies of the synthesized nanostructures. The time-dependent growth study shows that the nanostructures feature two-dimensional growth of WSi₂, resulting in nanonets and nanosheets. Cyclic voltammetry measurements of these nanostructures demonstrate the chemical capacitance characteristics of WSi₂ nanosheets and nanoribbons. Not only has this study paved a new route for preparing various nanostructures, but also these nanostructures are of great interest for nanodevices and electrochemical applications.