One-dimensional Silicon-Cadmium Selenide Heterostructures

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• 作者：X. H. Sun ; T. K. Sham ; R. A. Rosenberg ; G. K. Shenoy
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：June 21, 2007
• 年：2007
• 卷：111
• 期：24
• 页码：8475 - 8482
• 全文大小：1272K
• 年卷期：v.111,no.24(June 21, 2007)
• ISSN：1932-7455

文摘

We report the synthesis and characterization of 1D Si-CdSe heteronanostructures with different morphologiessuch as coaxial, biaxial, sandwiched, pattern wrapping, coiling, structures etc., via a one-step metal catalyzedthermal evaporation method. Both Si and CdSe exhibit single crystalline characteristics in the heterostructures,as revealed by scanning transmission electron microscopy. The Si nanowires formed directly from the Sisubstrate via the solid-liquid-solid process acts as the absorption site for CdSe deposition as well as thetemplate for the formation of 1D Si-CdSe heterostructures. Time-resolved X-ray excited optical luminescencefrom the 1D Si-CdSe heteronanostructures reveals two main emission features at 530 and 637 nm with slowand fast decay lifetime, respectively. The 530 and 637 nm emission is associated with the Si and CdSecomponent of the heterostructures, respectively.