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Temperature-dependent Raman spectroscopy studies of the interface coupling effect of monolayer ReSe single crystals on Au foils.

Nanotechnology; 29(20): 204003, 2018 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-29498623
Rhenium diselenide (ReSe), which bears in-plane anisotropic optical and electrical properties, is of considerable interest for its excellent applications in novel devices, such as polarization-sensitive photodetectors and integrated polarization-controllers. However, great challenges to date in the controllable synthesis of high-quality ReSe have hindered its in-depth investigations and practical applications. Herein, we report a feasible synthesis of monolayer single-crystal ReSe flakes on the Au foil substrate by using a chemical vapor deposition route. Particularly, we focus on the temperature-dependent Raman spectroscopy investigations of monolayer ReSe grown on Au foils, which present concurrent red shifts of E-like and A-like modes with increasing measurement temperature from 77-290 K. Linear temperature dependences of both modes are revealed and explained from the anharmonic vibration of the ReSe lattice. More importantly, the strong interaction of ReSe with Au, with respect to that with SiO/Si, is further confirmed by temperature-dependent Raman characterization. This work is thus proposed to shed light on the optical and thermal properties of such anisotropic two-dimensional three-atom-thick materials.