Controllable growth of 2D ReS2 flakes and their surface Raman enhancement effects
Two-dimensional (2D) ReS 2 has received widespread attention because of its unique anisotropic properties, weak interlayer interactions and broad application prospects. Therefore, the controllable and repeatable growth of 2D ReS 2 flakes is very important for studying their properties and practical applications. In this work, 2D single-crystalline ReS 2 flakes with different layer numbers were synthesized on mica substrates using chemical vapor deposition (CVD) by adjusting the distance between the mica substrate and Re source, and the growth mechanism was further discussed. The fluorescence quenching effect and surface-enhanced Raman scattering (SERS) effect of 2D ReS 2 flakes were investigated using rhodamine B (RhB), crystal violet (CV) and malachite green (MG) dye molecules as Raman probes. The results show that the fluorescence quenching effect and SERS effect of 2D ReS 2 flakes are enhanced with decreasing layer number. The lowest detection limits on monolayer ReS 2 flake substrates are 10 −10 M, 10 −9 M and 10 −8 M for RhB, CV and MG under 532 nm laser excitation, respectively. 2D ReS 2 flakes used as a sensitive SERS-active substrate have excellent uniformity and stability. The surface Raman enhancement mechanism of 2D ReS 2 flakes was discussed.
危险品化学品经营许可证（带存储）