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Title: 3C-SiC nanocrystals/TiO{sub 2} nanotube heterostructures with enhanced photocatalytic performance

p-type ultrathin 3C-SiC nanocrystals are coated on heat-treated n-type TiO{sub 2} nanotube arrays formed by electrochemical etching of Ti sheets to produce heterostructured photocatalysts. Depending on the amounts of 3C-SiC nanocrystals on the TiO{sub 2} nanotubes, photocatalytic degradation of organic species can be enhanced. The intrinsic electric field induced by the heterojunction promotes separation of the photoexcited electrons-holes in both the TiO{sub 2} nanotubes and 3C-SiC nanocrystals. Hence, holes can more effectively travel to the surface of 3C-SiC nanocrystals and there are more electrons on the surface of TiO{sub 2} nanotubes consequently forming more {sup •}O{sub 2}{sup −} and {sup •}OH species to degrade organic molecules.
Authors:
; ; ; ;  [1] ;  [2]
  1. Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, and National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China)
  2. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong (China)
Publication Date:
OSTI Identifier:
22300046
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CRYSTALS; ELECTRIC FIELDS; ELECTROCHEMISTRY; ELECTRONS; ETCHING; HEAT TREATMENTS; HETEROJUNCTIONS; HOLES; MOLECULES; NANOTUBES; PHOTOCATALYSIS; SILICON CARBIDES; SURFACES; TITANIUM OXIDES