skip to main content

SciTech ConnectSciTech Connect

Title: Effect of interfacial coupling on photocatalytic performance of large scale MoS{sub 2}/TiO{sub 2} hetero-thin films

Interface electronic behavior of two-dimensional large scale MoS{sub 2}/TiO{sub 2} hetero-thin films has been studied using photoemission spectroscopy. We show a clear experimental evidence for type II band alignment and upward band bending (∼0.55 eV) at the interface of this system. The valence band offset at monolayer MoS{sub 2}/TiO{sub 2} interface was measured to be 2.15 eV, while the conduction band offset was 1.00 eV. The unique interface band positions introduce a strong build-in electric field for efficient electron-hole separation. In addition, thermal treatment results in better interfacial coupling and charge separation efficiency thus enhanced visible light photoactivity. Our results explicate the mechanism and emphasize its huge potential in visible light photocatalysis.
Authors:
 [1] ; ; ;  [2] ;  [3]
  1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130 (China)
  2. Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 3, Research Link, 117602 Singapore (Singapore)
  3. School of Science, Hebei University of Technology, Tianjin 300130 (China)
Publication Date:
OSTI Identifier:
22412684
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COUPLING; ELECTRIC FIELDS; ELECTRONIC STRUCTURE; EMISSION SPECTROSCOPY; EV RANGE; HEAT TREATMENTS; HOLES; INTERFACES; MOLYBDENUM SULFIDES; PERFORMANCE; PHOTOCATALYSIS; PHOTOELECTRON SPECTROSCOPY; POTENTIALS; THIN FILMS; TITANIUM OXIDES; TWO-DIMENSIONAL SYSTEMS; VALENCE