Surface-enhanced Raman spectroscopy for DNA detection by nanoparticle assembly onto smooth metal films.
作者： Gary Braun , Seung Joon Lee , Mark Dante , Thuc-Quyen Nguyen , Martin Moskovits
DOI: 10.1021/JA070514Z
关键词:
摘要: A simple, sensitive, and reproducible sensing technique is described for the unambiguous detection of unlabeled single-stranded DNA by surface-enhanced Raman spectroscopy (SERS). By self-assembling probe-tethered Ag nanoparticles to a moderately smooth film using complementary target species, electromagnetic “hot spots” are created which strongly enhance signal species present in hot spot. These can include label (a molecule with very large cross-section) that dominates spectrum generates highly signals. The self-assembly process does not take place absence species. Consequently, strong SERS observed only presence target. was also absent noncomplementary AFM analysis indicates intensity arises from few surface-bound generate an enhancement factor ∼105−106 greater than metal alone. Nota...
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