Nanoscale probing of adsorbed species by tip-enhanced Raman spectroscopy

Tip-enhanced Raman spectroscopy (TERS) is based on the optical excitation of localized surface plasmons in the tip-substrate cavity, which provides a large but local field enhancement near the tip apex. We report on TERS with smooth single crystalline surfaces as substrates. The adsorbates were CN-...

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Bibliographic Details
Published inPhysical review letters Vol. 92; no. 9; p. 096101
Main Authors Pettinger, Bruno, Ren, Bin, Picardi, Gennaro, Schuster, Rolf, Ertl, Gerhard
Format Journal Article
LanguageEnglish
Published United States 05.03.2004
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Summary:Tip-enhanced Raman spectroscopy (TERS) is based on the optical excitation of localized surface plasmons in the tip-substrate cavity, which provides a large but local field enhancement near the tip apex. We report on TERS with smooth single crystalline surfaces as substrates. The adsorbates were CN- ions at Au(111) and malachite green isothiocyanate (MGITC) molecules at Au(111) and Pt(110) using either Au or Ir tips. The data analysis yields Raman enhancements of about 4 x 10(5) for CN- and up to 10(6) for MGITC at Au(111) with a Au tip, probing an area of less than 100 nm radius.
ISSN:0031-9007
DOI:10.1103/physrevlett.92.096101