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Spatially Sequential Growth of Various WSi2 Networked Nanostructures and Mechanisms

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journal contribution
posted on 19.09.2013, 00:00 by Mohammad Norouzi Banis, Xiangbo Meng, Yong Zhang, Mei Cai, Ruying Li, Xueliang Sun
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 6–10 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.