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

Hui Ma; Yue Tian; Anxin Jiao; Chang Wang; Mengya Zhang; Linqi Zheng; Guihua Li; Shuang Li; Shuang Li; Ming Chen; Ming Chen

doi:10.1364/OL.447995

Optics Letters
Vol. 47,
Issue 3,
pp. 670-673
(2022)
•https://doi.org/10.1364/OL.447995

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

Hui Ma, Yue Tian, Anxin Jiao, Chang Wang, Mengya Zhang, Linqi Zheng, Guihua Li, Shuang Li, and Ming Chen

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Hui Ma, Yue Tian, Anxin Jiao, Chang Wang, Mengya Zhang, Linqi Zheng, Guihua Li, Shuang Li, and Ming Chen, "Extraordinary approach to further boost plasmonic NIR-SERS by cryogenic temperature-suppressed non-radiative recombination," Opt. Lett. 47, 670-673 (2022)

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Abstract

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 10⁻¹⁷ 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.

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