Low-Symmetry Two-Dimensional ReS2 and its Heterostructures :Chemical Vapor Deposition Synthesis and Properties

Two-dimensional (2D) rhenium disulfide (ReS2) is a layer-structured functional nanomaterial with atomic thickness and few lattice symmetry elements. The low symmetry of the crystal structure endows 2D ReS2 with rich anisotropic physical and chemical properties, giving it great potential in the fieldsof nanophotonics, tactile sensors, and anisotropic electronic devices. The applications of 2D ReS2 rely on high-quality synthesis and a deep understanding of its properties. This review firstly categorizes the chemical vapor deposition ( CVD) methods of ReS2 into three groups based on the types of the metallic and non-metallic precursors applied in the growth, as well as the substrates. Different CVD strategies and the corresponding growth mechanisms are systematically summarized. Subsequently, the recent progress in the preparation of ReS2 in-plane and vertical 2D heterostructures is introduced. Approaches are divided into one-step method and two-step method based on the number of steps used in the CVD process. Finally, the anisotropic optical and electronic properties of 2D ReS2 are discussed. This review also puts forward an outlook on the challenges and opportunities of the synthesis and property investigation of 2D ReS2.