Tip-Enhanced Raman Spectra of Picomole Quantities of DNA Nucleobases at Au(111)
2007; American Chemical Society; Volume: 129; Issue: 21 Linguagem: Inglês
10.1021/ja071107q
ISSN1943-2984
AutoresKatrin F. Domke, Dai Zhang, Bruno Pettinger,
Tópico(s)Nanocluster Synthesis and Applications
ResumoWe show that label-free detection of picomole amounts of the four nucleobases, respectively, adsorbed at atomically smooth Au(111) is straightforward with tip-enhanced Raman (TER) spectroscopy. In addition to TER spectra that allow identification of the corresponding DNA base, topographic images of the nanometer-sized sample can be obtained. Only 130 adenine molecules present in the enhanced field region in the tip−sample gap are sufficient to record the adenine fingerprint, that is, the Raman band of the characteristic ring-breathing mode at 734 cm-1.
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