Charge Transfer‐Induced SERS Enhancement of MoS₂/Dopants Dependent on their Interaction Difference

Abstract 2D transition metal dichalcogenide materials have attracted increasing attention as active surface‐enhanced Raman spectroscopy (SERS) platforms. In this study, the influence of n‐ and p‐type doping of exfoliated MoS 2 (exMoS 2 ) hybrids on the SERS performance is investigated, employing Rhodamine 6G (R6G) as a probe molecule. It is demonstrated that n‐doped exMoS 2 hybrids (exMoS 2 mixed with C 60 , graphene, and sodium dodecyl sulfate) exhibit enhanced SERS intensities, while p‐doping (exMoS 2 mixed with TCNQ) resulted in inhibited SERS enhancement. A key discovery is the linear relationship between Raman enhancement of MoS 2 /dopant hybrids and the difference in their LUMO energy levels, which dictate the degree and direction of charge transfer. Interestingly, MC 60 ‐4, a C 60 ‐doped hybrid, deviates from the linear relationship, displaying remarkable SERS enhancement owing to its chemical interaction and unique Raman scattering activity. The findings provide critical insights into the SERS enhancement behavior of doped MoS 2 , facilitating precise tuning of SERS intensities by manipulating the MoS 2 doping state.