Abstract
A one-step method was proposed to prepare a high-performance surface-enhanced Raman scattering (SERS) substrate based on bulk MoS2 via femtosecond laser pulse modification. The Raman spectra of Rhodamine 6G (R6G) molecules were measured on different laser fluence treatment substrates with various solution concentrations. The most optimized laser-treated MoS2 substrate showed a large Raman enhancement factor of 1.67 × 105 and extremely high sensitivity for detection of R6G molecules, even down to 10–8 M. The morphology characterization, photoluminescence measurement, and electromagnetic simulation were used to reveal the laser treatment-dependent Raman enhancement mechanism. The results indicated that the p-doping effect induced by oxygen absorption led to holes filling on the top of the valence band after the laser treatment, which can enhance the charge transfer between MoS2 and R6G molecules and finally lead to the SERS effect. This method can provide a high-performance and cost-efficient way to prepare SERS substrates.
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