期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 130, 期 43, 页码 14040-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja804367c
关键词
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资金
- AFOSR [FA9550-06-1-0021]
- Robert A. Welch Foundation [C-1220]
- MURI [W911NF-04-01-0203]
Observations of two spectrally distinct ring breathing modes of guanine and adenine in the surface-enhanced Raman spectrum (SERS) of a dsDNA self-assembled monolayer on an Au nanoshell SERS substrate provide information concerning the orientation of its Constituent molecules. The two modes vary with DNA concentration in a highly systematic manner, consistent with studies suggesting DNA molecules tend toward a more horizontal orientation at low-surface concentrations and a more vertical conformation at high concentrations. The introduction of small molecular spacers coadsorbed onto the Au nanoshell surface to raise the DNA molecules yields a SERS spectrum consistent with a more upright molecular orientation.
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