Metal (Ag, Pt)-MoS₂ Hybrids Greenly Prepared Through Photochemical Reduction of Femtosecond Laser Pulses for SERS and HER

MoS₂-based nanohybrids have garnered extensive research interest for enhancing chemical catalytic performance, application of biochemical sensing, and inducing phase transition of MoS₂. This work presents a novel green method to prepared Ag-MoS₂ and Pt-MoS₂ nanohybrids through the photogenerated electrons of MoS₂ nanosheets induced by using femtosecond laser pulses. Metal (Ag, Pt) nanoparticles are reduced by capturing the photogenerated electrons of MoS₂, and in situ decorated on MoS₂ nanosheets, thus forming Ag-MoS₂ and Pt-MoS₂ nanohybrids, respectively. The proposed method does not need other chemical reagents except for the metal salts necessary for supplying metal cations, which commendably avoids the introduction of reagent byproducts to the reaction mixture, toxicity, and chemical or environmental contamination. This method also emphasizes the extensive application fields of MoS₂. For example, the prepared Ag-MoS₂ hybrids reveal excellent surface enhanced Raman scattering performance with the enhancement factor reaching 1.32 × 10⁷ and the detection limit low to 10^-11 M; the prepared 7.6% Pt-MoS₂ hybrids with C exhibit enhanced hydrogen evolution reaction activity with low Tafel slope of 25 mV/decade and high turnover frequency per exposed Mo of 11.15 H₂ s^-1 at 220 mV; demonstrating the remarkable prospects of MoS₂-based hybrids in chemical/biological molecule sensing as well as hydrogen production applications.