Fig. 25.

Synthesis of 2D TMC Janus structures by atomic substitution. Synthesis of 2D TMC Janus structures by atomic substitution. a Schematic illustration of the reaction setup for Janus SMoSe monolayer. b Different views of an eight-unit-cell Janus SMoSe monolayer. c Proposed mechanism for the sulfurization of monolayer MoSe₂ at different temperatures. d HRTEM image of the Janus SMoSe lattice. Reproduced with permission [182].

Copyright 2017, American Chemical Society. e Schematic showing the asymmetric MoSSe monolayer structure. f Schematics showing key reaction steps for room-temperature atomic-layer substitution process. g Tilted ADF-STEM image of the Janus MoSSe sample. Reproduced with permission [156]. Copyright 2021, NATL ACAD SCIENCES