Nanofabricated Surfaces: Atomic Force Microscopy and Surface-Enhanced Laser Spectroscopy at Ultrahigh Vacuum and Electrochemical Interfaces

本课题系统研究了表面增强激光光谱的微观机理，包括表面增强拉曼光谱、超拉曼光谱、二次谐波产生光谱和和频产生光谱。几种纳米结构制备方法，结合这些结构表面的扫描探针微观表征，将用于探测表面增强激光光谱的电磁和化学机制。这项工作由分析和表面化学项目支持，将通过塑造与主要理论描述中模型结构相匹配的表面，直接测试表面增强机制的现有模型。这项工作将有助于理解表面增强光谱学，以及纳米结构表面的发展和表征。预期影响将远远超出使用这种方法研究粗糙表面的范围。表面增强激光光谱分析方法的进一步发展依赖于对增强过程的定量预测解释的发展。该研究计划将通过一系列精心的实验，合理地制备表面结构，从而为该技术提供理论基础，这些表面结构可以准确地在理论上建模。从可建模表面的测量比较中获得的见解应该允许发展定量理论。预计还将产生制造具有纳米结构表面的材料的有用方法。

This research project involves a systematic study of the microscopic mechanisms of surface enhanced laser spectroscopies, including surface enhanced Raman, hyper-Raman, second harmonic generation, and sum frequency generation spectroscopy. Several methods of nanostructure preparation, combined with scanning probe microscopic characterization of these structured surfaces, will be used to probe the electromagnetic and chemical mechanisms of surface enhanced laser spectroscopies. This work, supported by the Analytical and Surface Chemistry Program, will directly test present models of the surface enhancement mechanism by fashioning surfaces which match the structures modeled in leading theoretical descriptions of the effect. Contributions to the understanding of the surface enhanced spectroscopy, as well as to the development and characterization of nanostructured surfaces should result from this work. Impact well beyond the use of this method for studies of roughened surfaces is expected. Further development of the analytical methods of surface enhanced laser spectroscopy relies on the development of a quantitative, predictive explanation of the enhancement process. This research program will develop the theoretical underpinning for this technique by a careful set of experiments which rationally prepare surface structures which can be accurately theoretically modeled. The insights gained from the comparison of measurements on modelable surfaces should allow development of a quantitative theory. It is expected that useful methods for the fabrication of materials with nanostructured surfaces will also result.