title: Novel TiO₂-Pt@SiO₂ nanocomposites with high photocatalytic activity.
abstract: This article reports a facile and controllable two-step method to construct TiO(2)-Pt@SiO(2) nanocomposites. TiO(2) nanoparticles (NPs), with small size and high surface energy, were synthesized by a solvothermal reaction process. The TiO(2)-Pt@SiO(2) nanocomposites were fabricated by a reverse micro-emulsion method. SiO(2) shell coated NPs were adopted for further photocatalytic reaction. Because of their small size and high surface energy, TiO(2)@SiO(2) and TiO(2)-Pt@SiO(2) nanocomposites show higher photocatalytic activity than commercial Degussa P25. Compared with TiO(2)@SiO(2), TiO(2)-Pt@SiO(2)nanocomposites have improved photocatalytic activity due to the Pt induced spatial separation of electrons and holes. The silica shells not only maintain the structure of the nanocomposites but also prevent their aggregation during the photocatalytic reactions, which is highly important for the good durability of the photocatalyst. This strategy is simple, albeit efficient, and can be extended to the synthesis of other composites of noble metals. It has opened a new window for the construction of hetero-nanocomposites with high activity and durability, which would serve as excellent models in catalytic systems of both theoretical and practical interest.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China.
authors.forename: Hao-Shuai
authors.initials: HS
authors.lastname: Wu
authors.forename: Ling-Dong
authors.initials: LD
authors.lastname: Sun
authors.forename: Huan-Ping
authors.initials: HP
authors.lastname: Zhou
authors.forename: Chun-Huan
authors.initials: CH
authors.lastname: Yan
mesh_terms: D002384:Catalysis; D008027:Light; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010782:Photolysis; D010984:Platinum / Q000737:chemistry; D012235:Rhodamines / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D012235:Rhodamines; C507641:TiO2-SiO2; D010984:Platinum; D012822:Silicon Dioxide; D014025:Titanium; C029773:rhodamine B