Fabrication and characterization of amorphous silica nanostructures |
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Authors: | Lei Jin Jianbo Wang Guangyi Cao Wallace C.H. Choy |
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Affiliation: | a Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, and Department of Physics, Wuhan University, Wuhan 430072, China b Center for Electron Microscopy, Wuhan University, Wuhan 430072, China c Department of Electrical and Electronic Engineering, University of Hong Kong, Pokfulam Road, Hong Kong, China |
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Abstract: | Large-scale amorphous silica nanostructures, including nanowires, nanotubes and flowerlike nanowire bunches depending on the position, have been fabricated on silicon wafer through a cheap route under the assistance of gold and germanium. Accompanying the observation of blue-green light emission, comprehensive micro-structural characterization reveals that the growth of nanostructures is catalyzed only by gold whereas the final morphology of nanostructures depends on the location to germanium ball. Au2Si, a compound of gold and silicon, is also disclosed as an intermediate state during the catalysis. Correspondingly, a growth scheme is proposed based on the experimental results and the vapor-liquid-solid mechanism. |
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Keywords: | 61.46.-w 68.37.Hk 68.37.Lp 81.16.Hc |
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