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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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Nanoscale Structural Engineering via Phase Segregation: Au-Ge System

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Title
Nanoscale Structural Engineering via Phase Segregation: Au-Ge System
Author
Chueh, Yu-LunBoswell, Cosima NYuan, Chun-WeiShin, Swanee J.Takei, KuniharuHo, Johnny C.Ko, HyunhyubFan, ZhiyongHaller, E. E.Chrzan, D. C.Javey, Ali
Keywords
Nanoscale diffusion; Nanowires; Phase segregation; Supercooling
Issue Date
2010-02
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.10, no.2, pp.393 - 397
Abstract
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.
URI
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DOI
10.1021/nl902597m
ISSN
1530-6984
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ECHE_Journal Papers
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