Journal
ROYAL SOCIETY OPEN SCIENCE
Volume 4, Issue 7, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsos.170422
Keywords
hand-held Raman spectrometer; short-wave infrared excitation; surface-enhanced Raman scattering nanotags; limits of detection; hollow gold nanoshells; chalcogenopyrylium dyes
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Funding
- Royal Society
- Defence Science and Technology Laboratory (Dstl)
- Engineering and Physical Sciences Research Council [EP/J500550/1]
- National Science Foundation [CHE-1151379]
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This is the first report of the use of a hand-held 1064 nm Raman spectrometer combined with red-shifted surface-enhanced Raman scattering (SERS) nanotags to provide an unprecedented performance in the short-wave infrared (SWIR) region. A library consisting of 17 chalcogenopyrylium nanotags produce extraordinary SERS responses with femtomolar detection limits being obtained using the portable instrument. This is well beyond previous SERS detection limits at this far red-shifted wavelength and opens up new options for SERS sensors in the SWIR region of the electromagnetic spectrum (between 950 and 1700 nm).
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