Abstract
Two-dimensional (2D) transition metal dichalcogenides materials have recently been explored as possible substrates for surface-enhanced Raman spectroscopy (SERS). However, in comparison to the conventional noble-metal-based counterpart, most of the 2D materials have very small area for SERS measurement, which is a big limitation toward practical applications. Herein, we presented our study of SERS using substrate-scale continuous ReS2 monolayer films on flexible mica substrate. We demonstrated that the charge transfer between the target molecules and the atomically thin ReS2 can be modulated by the underlying substrate of ReS2, resulting in greatly different suppressing level of FL background. Kelvin probe force microscopy revealed a large difference of surface potential between ReS2/SiO2 and ReS2/mica, suggesting that the strong FL quenching of molecular on ReS2/mica might be attributed to the inert surface of layered mica. The large-area ReS2 monolayer films on mica show a detection limit of R6G molecule around 10−7 M and a robust SERS performance after an exposure in air for one month and repeated bending for 1000 times. Our work explores the practical application of 2D ReS2 for molecular detection via SERS technique.
Published Version
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