Electronic and photocatalytic properties of transition metal decorated molybdenum disulfide
1University of Oulu Graduate School
2University of Oulu, Faculty of Science, Physics
|Online Access:||PDF Full Text (PDF, 3.4 MB)|
|Persistent link:|| http://urn.fi/urn:isbn:9789526220086
Oulu : University of Oulu,
|Publish Date:|| 2018-08-30
|Thesis type:||Doctoral Dissertation
|Defence Note:||Academic Dissertation to be presented with the assent of the Faculty of Science, University of Oulu for public discussion in the Auditorium Saalastinsali, on September 12th, 2018, at 12 o’clock noon.
Doctor Wei Cao
Professor Marko Huttula
Professor Toomas Plank
Professor Jian Wang
Professor Peter Liljeroth
Doctor Wei Cao
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 Ni-Ag-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.
Report series in physical sciences
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