Journal Article transition metal dichalcogenides 1D nanobelts 2D materials 2D ternary alloys Research Support, Non-U.S. Gov't WS2/graphene heterostructure buckling electronic-state modulation eutectic metal alloy graphene wrinkle hydrogen evolution reaction layer control phase-transition-induced growth photodetectors single-crystalline transition metal ditellurides strain relaxation ternary compositional tuning topological defect