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Nanoscale probing of adsorbed species by tip-enhanced Raman spectroscopy

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Pettinger,  Bruno
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ren,  Bin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Picardi,  Gennaro
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Schuster,  Rolf
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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e096101.pdf
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Citation

Pettinger, B., Ren, B., Picardi, G., Schuster, R., & Ertl, G. (2004). Nanoscale probing of adsorbed species by tip-enhanced Raman spectroscopy. Physical Review Letters, 92(09), 096101–1-096101–4. doi:10.1103/PhysRevLett.92.096101.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0D40-9
Abstract
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 4x105 for CN– and up to 106 for MGITC at Au(111) with a Au tip, probing an area of less than 100 nm radius.