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Extreme red shifted SERS nanotags

Bedics, Matthew A. and Kearns, Hayleigh and Cox, Jordan M. and Mabbott, Sam and Ali, Fatima and Shand, Neil C. and Faulds, Karen and Benedict, Jason B. and Graham, Duncan and Detty, Michael R. (2015) Extreme red shifted SERS nanotags. Chemical Science, 6 (4). pp. 2302-2306. ISSN 2041-6520

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    Abstract

    Surfaced enhanced Raman scattering (SERS) nanotags operating with 1280 nm excitation were constructed from reporter molecules selected from a library of 14 chalcogenopyrylium dyes containing phenyl, 2-thienyl, and 2-selenophenyl substituents and a surface of hollow gold nanoshells (HGNs). These 1280 SERS nanotags are unique as they have multiple chalcogen atoms available which allow them to adsorb strongly onto the gold surface of the HGN thus producing exceptional SERS signals at this long excitation wavelength. Picomolar limits of detection (LOD) were observed and individual reporters of the library were identified by principal component analysis and classified according to their unique structure and SERS spectra.