期刊
NANO LETTERS
卷 10, 期 10, 页码 4040-4048出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl102026p
关键词
Surface plasmon; single-molecule; charge-transfer; surface-enhanced Raman scattering
类别
资金
- Korean government (MEST) [2010-0001857, 2010-0028713, 2010-0019196, 331-2007-1-C00134]
- Korea Research Institute of Science and Standard (KRISS)
- National Research Foundation of Korea [2007-331-C00134, 331-2007-1-C00134, 2008-0062255] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We measured the surface-enhanced Raman scattering (SERS) of individual gold nanoparticle-4-aminobenzenethiol (ABT)-gold film junctions to investigate the charge-transfer (CT) enhancement of the SERS signals Despite the mild electromagnetic field enhancement (similar to 10(5)) and high surface density of the ABT-molecules (similar to 240 molecules/hotspot) at the junctions, we observed the clear spectral and temporal signatures of CT-enhanced single-molecule SERS (SM-SERS) The result reveals that only a small fraction of the molecules at the junction has a significant CT-enhancement of I 10(1)similar to 10(3), whereas the rest of the molecules are nearly CT-inactive Furthermore, the result also proves that overall (charge-transfer and electromagnetic) enhancement of 10(6)-10(8) is sufficient to observe the SM-SERS of an electronically off-resonant molecule, which disproves the widespread belief that a minimum enhancement of similar to 10(14) is required for SM-SERS
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