Journal
NANO LETTERS
Volume 21, Issue 9, Pages 4057-4061Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00998
Keywords
tip-enhanced Raman spectroscopy; low-temperature scanning tunneling microscopy; Si(111)-7 x 7 surface; atomic point contact
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Funding
- JST-PRESTO [JPMJPR16S6]
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The research demonstrates a method to significantly enhance Raman scattering by forming atomic point contact (APC), thereby detecting phonons on the silicon surface, and shows the chemical sensitivity of APC-TERS, expanding the applicability of TERS.
Tip-enhanced Raman scattering (TERS) has recently demonstrated the exceptional sensitivity to observe vibrational structures on the atomic scale. However, it strongly relies on electromagnetic enhancement in plasmonic nanogaps. Here, we demonstrate that atomic point contact (APC) formation between a plasmonic tip and the surface of a bulk Si sample can lead to a dramatic enhancement of Raman scattering and consequently the phonons of the reconstructed Si(111)-7 x 7 surface can be detected. Furthermore, we demonstrate the chemical sensitivity of APC-TERS by probing local vibrations resulting from Si-O bonds on the partially oxidized Si(111)-7 x 7 surface. This approach will expand the applicability of ultrasensitive TERS, exceeding the previous measurement strategies that exploit intense gap-mode plasmons, typically requiring a plasmonic substrate.
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