Temperature-Mediated Selective Growth of MoS sub(2)/WS sub(2) and WS sub(2)/MoS sub(2) Vertical Stacks on Au Foils for Direct Photocatalytic Applications

A growth-temperature-mediated two-step chemical vapor deposition strategy is designed to synthesize MoS sub(2)/WS sub(2) and WS sub(2)/MoS sub(2) stacks on Au foils. Predominantly A-A stacked MoS sub(2)/WS sub(2) and A-B stacked WS sub(2)/MoS sub(2) are selectively achieved and confirmed. Relative enhancements or reductions in photocatalytic activities of MoS sub(2)/WS sub(2) or WS sub(2)/MoS sub(2) are observed under illumination, because the type-II band alignment enables directional electron flow from electrode to active site.