Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 10, Pages 1357-1362Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz300374d
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Funding
- AFOSR/DARPA [BAA07-61, FA9550-08-1-0257]
- Molecular Foundry through the Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
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Surface-enhanced Raman spectroscopy (SEAS) is a known approach for detecting trace amounts of molecular species. Whereas SERS measurements have focused on enhancing the signal for sensing trace amounts of a chemical moiety, understanding how the substrate alters molecular Raman spectra can enable optical probing of analyte binding chemistry. Here we examine binding of trans-1,2-two(4-pyridyl) ethylene (BPE) to Au surfaces and understand variations in experimental data that arise from differences in how the molecule binds to the substrate. Monitoring differences in the SEAS as a function of incubation time, a period of several hours in our case, reveals that the number of BPE molecules that chemically binds with the Au substrate increases with time. In addition, we introduce a direct method of accessing relative chemical enhancement from experiments that is in quantitative agreement with theory. The ability to probe optically specific details of metal/molecule interfaces opens up possibilities for using SERS in chemical analysis.
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