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在存在水相葡萄糖的情况下,对银纳米立方体上烷硫醇单分子层分子结构的表面增强拉曼光谱研究。

A SERS study of the molecular structure of alkanethiol monolayers on Ag nanocubes in the presence of aqueous glucose.

作者信息

Rycenga Matthew, McLellan Joseph M, Xia Younan

机构信息

Department of Biomedical Engineering, Washington University, St. Louis, Missouri 63130.

出版信息

Chem Phys Lett. 2009 Sep 22;463(1-3):166-171. doi: 10.1016/j.cplett.2008.08.062.

Abstract

We report progress towards the surface-enhanced Raman scattering (SERS) characterization of self-assembled monolayers (SAMs) on uniform Ag nanocubes. This study quantifies changes in the SAMs induced by the presence of aqueous glucose. The SAMs were prepared from dodecanethiol and they were representative of highly ordered monolayers as indicated by SERS analysis. We examined the SAMs response to glucose and observed conformational changes in the alkanethiolate SAMs. Analysis of the trans and gauche bands as well as the C-H stretching modes of the SAMs suggest that the analyte-SAM interactions were superficial and there was no penetration for the glucose molecules into the monolayers.

摘要

我们报告了在均匀银纳米立方体上对自组装单分子层(SAMs)进行表面增强拉曼散射(SERS)表征的进展。本研究量化了水相葡萄糖的存在对SAMs所引起的变化。这些SAMs由十二烷硫醇制备而成,如SERS分析所示,它们代表了高度有序的单分子层。我们研究了SAMs对葡萄糖的响应,并观察到链烷硫醇盐SAMs的构象变化。对SAMs的反式和顺式带以及C-H伸缩模式的分析表明,分析物与SAMs之间的相互作用是表面性的,葡萄糖分子没有渗透到单分子层中。

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