Before revision: Layered structure of MoS2, Mo in green, S in yellow Transition-metal dichalcogenides Transition-metal dichalcogenide monolayers (TMDs or TMDCs) are a class of two-dimensional materials that have the chemical formula MX2, where M represents transition metals from group VI , V and VI, and X represents a chalcogen such as sulfur, selenium or tellurium.
After revision: Layered structure of MoS2, Mo in green, S in yellow Transition-metal dichalcogenides Transition-metal dichalcogenide monolayers (TMDs or TMDCs) are a class of two-dimensional materials that have the chemical formula MX2, where M represents transition metals from group IV , V and VI, and X represents a chalcogen such as sulfur, selenium or tellurium.