期刊
NANO LETTERS
卷 10, 期 2, 页码 393-397出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl902597m
关键词
Phase segregation; nanowires; nanoscale diffusion; supercooling
类别
资金
- MARCO/MSD
- Intel Corporation
- NSF COINS
- Berkeley Sensor and Actuator Center
- U.S. Department of Energy [DE-AC02-05CH11231]
- Intel Graduate Fellowship
- LBNL
A tunable structural engineering of nanowires based on template-assisted alloying and phase segregation processes is demonstrated. The Au-Ge system, which has a low eutectic temperature and negligible solid solubility (< 10(-3) atom %)of Au in Ge at low temperatures, is utilized. Depending on the Au concentration of the initial nanowires, final structures ranging from nearly periodic nanodisk patterns to core/shell and fully alloyed nanowires are produced. The formation mechanisms are discussed in detail and characterized by in situ transmission electron microscopy and energy-dispersive spectrometry analyses. Electrical measurements illustrate the metallic and semiconducting characteristics of the fully alloyed and alternating Au/Ge nanodisk structures, respectively.
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