| 초록 |
We report a simple and effective method for hydrogenation of monolayer MoSe2 using hydrogen plasma treatment. Covalent bonding of hydrogen to MoSe2 was confirmed by X-ray photoelectron spectroscopy, and the degree of hydrogenation was modulated from 32 % to 80% by increasing plasma treatment time from 5 to 40 s. Transmission electon microscopy proved a 1.5% reduction in the lattice constant of hydrogenated MoSe2 without structural damages or defects; crystal structures of hydrogenated MoSe2 and as-prepared MoSe2 were identical. Photoluminescence (PL) investigation of hydrogenated MoSe2 showed charge transfer from hydrogen to MoSe2. Furthermore, reversible desorption of hydrogen from hydrogenated MoSe2 was achieved by heat treatment. This reversible hydrogen adsorption and desorption lends control over optical and electrical properties of monolayer MoSe2 and contributes to hydrogen functionalization of monolayer transition metal dichalcogenides and other two-dimensional materials. |
