[en] Surface-enhanced Raman scattering (SERS) is a well-established technique that enables the detection of very low molecular concentrations down to single molecules. Typical applications of SERS are the consistent identification of various samples used in chemistry, biology, and physics among others. In contrast to common SERS setups, where lasers are used as excitation source, we exploit SERS to perform Raman spectroscopy with a light-emitting diode (LED). We demonstrate the applicability of our approach on four different Raman reporters. We unambiguously distinguish two similar designer molecules 4-nitrothiophenol (p-NTP) and 5,5-dithio-bis-(2-nitrobenzoic acid) (DTNB) that are often used in SERS experiments. Additionally, we probe Rhodamine 6G that is used in many different applications and carbon nanotubes as a one-dimensional solid state nanosystem. The LED excited surface-enhanced Raman spectra reproduce the characteristic Raman modes of the different samples. We compare the LED spectra to Raman spectra excited with a laser at the same wavelength. We envision the combination of LED sources with SERS substrates in the next generation of handheld devices and low-cost Raman setups.
Disciplines :
Physics
Author, co-author :
Wasserroth, Sören
Gordeev, Georgy ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Juergensen, Sabrina
Kusch, Patryk
External co-authors :
yes
Language :
English
Title :
Exploiting plasmonic enhancement with light-emitting diode excitation in surface-enhanced Raman scattering
Publication date :
2022
Journal title :
Journal of Raman Spectroscopy
ISSN :
1097-4555
Publisher :
John Wiley & Sons, Hoboken, United States - New York
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