Extraordinary approach to further boost plasmonic NIR-SERS by cryogenic temperature-suppressed non-radiative recombination

We report an effective strategy to promote the near-infrared surface-enhanced Raman scattering spectroscopy (NIR-SERS) activity by boosting the photon-induced charge transfer (PICT) efficiency at cryogenic temperature. Based on as-prepared Au/Ag nano-urchins (NUs) with abundant surface defects, the...

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Bibliographic Details
Published in:Optics letters 2022-02, Vol.47 (3), p.670-673
Main Authors: Ma, Hui, Tian, Yue, Jiao, Anxin, Wang, Chang, Zhang, Mengya, Zheng, Linqi, Li, Guihua, Li, Shuang, Chen, Ming
Format: Article
Language:English
Subjects:
Charge efficiency
Charge transfer
Cryogenic temperature
Electrons
Gold
Lattice vibration
Low temperature
Near infrared radiation
Radiative recombination
Raman spectra
Raman spectroscopy
Recombination, Genetic
Room temperature
Silver
Spectroscopy, Near-Infrared
Spectrum Analysis, Raman
Surface defects
Temperature
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Summary:We report an effective strategy to promote the near-infrared surface-enhanced Raman scattering spectroscopy (NIR-SERS) activity by boosting the photon-induced charge transfer (PICT) efficiency at cryogenic temperature. Based on as-prepared Au/Ag nano-urchins (NUs) with abundant surface defects, the extremely low temperature (77 K) can significantly weaken the metallic lattice vibration and reduce the recombination of thermal phonons and photoexcited electrons, then accelerate the migration of energetic electrons. It enables the NIR-SERS detection limit of dye molecules to be achieved at 10 M, which is nearly three orders of magnitude better than that at room temperature. The present work provides a new, to the best of our knowledge, approach for ultra-trace NIR-SERS bioanalysis.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.447995