Vapor–Liquid–Solid and Vapor–Solid Growth of Phase-Change Sb2Te3 Nanowires and Sb2Te3/GeTe Nanowire Heterostructures

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• 作者：Jin Seok Lee ; Sarah Brittman ; Dong Yu ; Hongkun Park
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：May 14, 2008
• 年：2008
• 卷：130
• 期：19
• 页码：6252 - 6258
• 全文大小：1831K
• 年卷期：v.130,no.19(May 14, 2008)
• ISSN：1520-5126

文摘

We report the synthesis and characterization of radial heterostructures composed of an antimony telluride (Sb₂Te₃) core and a germanium telluride (GeTe) shell, as well as an improved synthesis of Sb₂Te₃ nanowires. The synthesis of the heterostructures employs Au-catalyst-assisted vapor–liquid–solid (VLS) and vapor−solid (VS) mechanisms. Energy-dispersive X-ray spectrometry indicates that Sb and Ge are localized in the Sb₂Te₃ and GeTe portions, respectively, confirming the alloy-free composition in the core/shell heterostructures. Transmission electron microscopy and diffraction studies show that Sb₂Te₃ and GeTe regions exhibit rhombohedral crystal structure. Both Sb₂Te₃ and GeTe grow along the [110] direction with an epitaxial interface between them. Electrical characterization of individual nanowires and nanowire heterostructures demonstrates that these nanostructures exhibit memory-switching behavior.