Applied Microscopy

Korean Society of Microscopy (한국현미경학회)
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Tunable Nanostructure of TiO2/Reduced Graphene Oxide Composite for High Photocatalysis

  • He, Di (Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Science and Engineering, Beijing University of Technology) ;
  • Li, Yongli (Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Science and Engineering, Beijing University of Technology) ;
  • Wang, Jinshu (Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Science and Engineering, Beijing University of Technology) ;
  • Yang, Yilong (Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Science and Engineering, Beijing University of Technology) ;
  • An, Qier (Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Science and Engineering, Beijing University of Technology)
  • Received : 2015.12.11
  • Accepted : 2016.01.25
  • Published : 2016.03.30
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Abstract

In this study $TiO_2$/reduced graphene oxide ($TiO_2/rGO$) bipyramid with tunable nanostructure was fabricated by two-step solvothermal process and subsequent heat-treatment in air. The as-synthesized anatase $TiO_2$ nanocrystals possessed morphological bipyramid with exposed dominantly by (101) facets. Polyethylenimine was utilized during the combination of $TiO_2$ and graphene oxide (GO) to tune the surface charge, hindering the restack of graphene during solvothermal process and resulting in 1 to 5 layers of rGO wrapped on $TiO_2$ surface. After a further calcination, a portion of carbon quantum dots (CQDs) with a diameter about 2 nm were produced owing to the oxidizing and cutting of rGO on $TiO_2$. The as-prepared $TiO_2/rGO$ hybrid showed a highly photocatalytic activity, which is about 3.2 and 7.7 times enhancement for photodegradation of methyl orange with compared to pure $TiO_2$ and P25, respectively. We assume that the improvement of photocatalysis is attributed to the chemical bonding between rGO/CQDs and $TiO_2$ that accelerates photogenerated electron-hole pair separation, as well as enhances light harvest.

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