Intramolecular Insight into Adsorbate-Substrate Interactions via Low-Temperature, Ultrahigh-Vacuum Tip-Enhanced Raman Spectroscopy

被引：123

作者：

Klingsporn, Jordan M. ^{[1
]}

Jiang, Nan ^{[1
]}

Pozzi, Eric A. ^{[1
]}

Sonntag, Matthew D. ^{[1
]}

Chulhai, Dhabih ^{[2
]}

Seideman, Tamar ^{[1
]}

Jensen, Lasse ^{[2
]}

Hersam, Mark C. ^{[1
,3
]}

Van Duyne, Richard P. ^{[1
,4
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

[2] Penn State Univ, Dept Chem, University Pk, PA 16802 USA

[3] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[4] Northwestern Univ, Dept Biomed Engn, Evanston, IL 60208 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2014年 / 136卷 / 10期

基金：

美国国家科学基金会;

关键词：

SCANNING-TUNNELING-MICROSCOPY; SINGLE-MOLECULE; NEAR-FIELD; NANOPARTICLE; NANOSCALE; SPECTRUM; AU(111);

D O I：

10.1021/ja411899k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Tip-enhanced Raman spectroscopy (TEAS) provides chemical information for adsorbates with nanoscale spatial resolution, single-molecule sensitivity, and, when combined with scanning tunneling microscopy (STM), Angstrom-scale topographic resolution. Performing TERS under ultrahigh-vacuum conditions allows pristine and atomically smooth surfaces to be maintained, while liquid He cooling minimizes surface diffusion of adsorbates across the solid surface, allowing direct STM imaging. Low-temperature TER (LT-TER) spectra differ from room-temperature TER (RT-TER), RT surface-enhanced Raman (SER), and LT-SER spectra because the vibrational lines are narrowed and shifted, revealing additional chemical information about adsorbate-substrate interactions. As an example, we present LT-TER spectra for the rhodamine 6G (R6G)/Ag(111) system that exhibit such unique spectral shifts. The high spectral resolution of LT-TERS provides intramolecular insight in that the shifted modes are associated with the ethylamine moiety of R6G. LT-TERS is a promising approach for unraveling the intricacies of adsorbate-substrate interactions that are inaccessible by other means.

引用

页码：3881 / 3887

页数：7

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