Abstract
Two-dimensional crystals-based surface-enhanced Raman scattering (SERS) substrates are a research hot spot in the realm of chemistry and biology. Herein, a novel hybrid substrate based on AuNPs/GaTe/Au-film is proposed and fabricated for SERS activity. Finite-difference time-domain numerical simulations demonstrate that the plasmonic coupling in the hybrid structure, particularly the LSPs coupling of AuNPs and Au-film, promotes an enhanced electric field and consequently, greatly enhances the Raman activity. Impressively, the enhancement factor of 3 × 105 and the limiting detection concentration of 10−14 M have been achieved for the rhodamine 6G molecules, which are equivalent to the best results achieved from the patterned graphene substrates. Due to its simple structure, cost-effectiveness, good uniformity, reproducibility, and stability, it is expected that such a SERS substrate will open up a new way toward the ultrasensitive detection of molecules.
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National Natural Science Foundation of China (U1737109, 11933006).
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Lu, P., Wang, Y., Xu, H. et al. Surface-enhanced Raman scattering on sandwiched structures with gallium telluride. J Mater Sci 55, 10047–10055 (2020). https://doi.org/10.1007/s10853-020-04729-w
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DOI: https://doi.org/10.1007/s10853-020-04729-w