| 초록 |
Two-dimensional transition metal dichalcogenide compounds have been intensively studied because of their potential applications for next-generation semiconducting nanodevices. In particular, MoTe2 is a representative 2D TMD material which possesses a unique property of polymorphism in which the crystal structures are changed according to the external conditions such as temperature, pressure, and surface state. However, the study of polymorphism with few-layers scheme has been limited because of subtle control to retain their original crystal structures under thinning procedures. Here, we report a new thinning procedure of polymorphic MoTe2 from bulk to few-layers without polymorph changes. We conducted a laser irradiation on the 2H-MoTe2 flakes, which are coated with multilayers of silica composite. Different from the formation of 1T’ phase in the laser-thinned 2H flake, silica-composite coated 2H-MoTe2 flakes were thinned without the formation of 1T’. Our study demonstrates that silica-composite nanocoating on 2D materials preserve their original crystal structure and chemical composition, providing well-qualified nanofilms for various potential device applications. |
