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http://hdl.handle.net/10553/122130
Title: | Photo-induced enhanced Raman spectroscopy for universal ultra-trace detection of explosives, pollutants and biomolecules | Authors: | Ben-Jaber, Sultan Peveler, William J. Quesada Cabrera, Raúl Cortés, Emiliano Sotelo Vázquez, Carlos Abdul Karim, Nadia Maier, Stefan A. Parkin, Ivan P. |
UNESCO Clasification: | 2301 química analítica 220808 Fuentes de partículas 230117 Espectroscopia Ramn |
Keywords: | Analytical chemistry Nanoparticles Nanophotonics and plasmonics Raman spectroscopy |
Issue Date: | 2016 | Journal: | Nature Communications | Abstract: | Surface-enhanced Raman spectroscopy is one of the most sensitive spectroscopic techniques available, with single-molecule detection possible on a range of noble-metal substrates. It is widely used to detect molecules that have a strong Raman response at very low concentrations. Here we present photo-induced-enhanced Raman spectroscopy, where the combination of plasmonic nanoparticles with a photo-activated substrate gives rise to large signal enhancement (an order of magnitude) for a wide range of small molecules, even those with a typically low Raman cross-section. We show that the induced chemical enhancement is due to increased electron density at the noble-metal nanoparticles, and demonstrate the universality of this system with explosives, biomolecules and organic dyes, at trace levels. Our substrates are also easy to fabricate, self-cleaning and reusable. | URI: | http://hdl.handle.net/10553/122130 | ISSN: | 2041-1723 | DOI: | 10.1038/ncomms12189 | Source: | Nature Communications [ISSN 2014-1723], v. 7, 12189 |
Appears in Collections: | Artículos |
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