Electronic and photocatalytic properties of transition metal decorated molybdenum disulfide
This thesis is dedicated to realizations and physical understanding of electronic and photocatalytic properties after decorating transition metals to the semiconducting molybdenum disulfide. Synthesized via facile wet chemical methods, the MoS2 Au, MoS2 Au Ni and MoS2 Ag Ni composites were formed as binary or ternary compounds. The Au nanoparticles are stably joined to the MoS2 matrix without deteriorating layered structures of the host. After introducing the Au nanoglue as a common buffer, a metallic contact is reached between Ni and MoS2, and attributed to new electron migration channel via MoS2 edge contact. Adapting the Ag as the buffer element can attach the Ni to the basal plane of the MoS2 beside edge contact. The NiAg MoS2 composite effectively splits water under visible light irradiation and produce hydrogen. The excellent photocatalytic activity is attributed to effective charge migration through dangling bonds at the MoS2 Ag Ni alloy interface and the activation of MoS2 basal planes.