| Original Articles |
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Dependence of Morphology of SiOx Nanowires on the Supersaturation of Au-Si Alloy Liquid Droplets Formed on the Au Coated Si Substrate |
| ZHANG Han1,2;LI Ji-Xue3;JIN Ai-Zi1,4;ZHANG Ze1 |
| 1Beijing Laboratory of Electron Microscopy, Institute of Physics, Chinese Academy of Sciences, P. O. Box 2724, Beijing 100080
2Department of Material Science and Engineering, Tsinghua University,
3Department of Material Science, Jilin Institute of Technology, Changchun 130025
4Laboratory of Super-hard Material, Jilin University, Changchun 130023
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| Cite this article: |
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ZHANG Han, LI Ji-Xue, JIN Ai-Zi et al 2001 Chin. Phys. Lett. 18 1529-1532 |
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Abstract A thermodynamic theory about the dependence of morphology of SiOx nanowires on the super-saturation of alloy liquid droplets has been proposed on the basis of the vapor-liquid-solid growth mechanism and has been supported experimentally. By changing the Si-concentration in the Au-Si liquid droplets formed on the Au-coated Si substrate, firework-, tulip-, and bud-shaped SiOx nanowires were synthesized by a thermal evaporation method and distributed concentrically around some void defects in the Si substrate. The voids were formed underneath the surface of the Si substrate during the thermal evaporation at 850°C and resulted in the Si-concentration deficient thus different saturation of Au-Si droplets. Electron microscopy analysis showed that the nanowires had an amorphous structure and were terminated by Au-Si particles.
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| Keywords:
81.16.HC
82.60.Lf
64.70.Nd
81.07.Bc
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Published: 01 November 2001
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| PACS: |
81.16.Hc
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(Catalytic methods)
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82.60.Lf
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(Thermodynamics of solutions)
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64.70.Nd
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(Structural transitions in nanoscale materials)
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81.07.Bc
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(Nanocrystalline materials)
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