Synthesis and functionalization of two-dimensional materials: Graphene, hexagonal boron nitride, and transition metal dichalcogenides

We are conducting a wide range of research on graphene and related two-dimensional materials from basic physics to device applications towards their electronics/photonics applications. In this paper, we review our recent research activities on the growth and functionalization of graphene, hexagonal boron nitride, and transition metal dichalcogenides with the emphasis on the following four topics; Raman spectroscopic visualization of grain boundaries in chemical-vapor-deposition (CVD) grown graphene by isotope labeling, CVD of h-BN on heteroepitaxial Co films, synthesis of layer-controlled MoS₂ and WS₂ sheets by sulfurization of thin metal films, and photodetection with graphene p-n junction fabricated using interface modification.