Journal
NANOSCALE
Volume 5, Issue 10, Pages 4151-4155Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr00966a
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Funding
- Natural Science Foundation of China [90923003, 10874234]
- National Basic Research Project of China [2009CB930701]
- Fundamental Research Funds for the Central Universities [GK201101006]
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Electric field gradient quadrupole Raman modes are observed in plasmon-driven chemical reactions investigated with high vacuum tip-enhanced Raman spectroscopy (HV-TERS). TER spectra reveal that 4-nitrobenzenethiol (4NBT) catalytically dimerizes to dimercaptoazobenzene (DMAB) under an HV-TERS setup. More importantly, we find that the electric field gradient leads to strong enhancement of the infrared (IR)-active modes of DMAB. The observation of both the Raman-active and IR-active modes of DMAB provides spectral evidence for ultrasensitive chemical analysis.
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