Gold–Titanium(IV) Oxide Plasmonic Photocatalysts Prepared by a Colloid-Photodeposition Method: Correlation Between Physical Properties and Photocatalytic Activities

• DOI: 10.1021/la301944b
• Publication Date: 2012-08-19T14:39:58Z
• Authors: Atsuhiro Tanaka; Asako Ogino; Moe Iwaki; Keiji Hashimoto; Akira Ohnuma; Fumiaki Amano; Bunsho Ohtani; Hiroshi Kominami
• Keywords: Titanium oxide

Colloidal gold (Au) nanoparticles were prepared and successfully loaded on titanium(IV) oxide (TiO2) without change in the original particle size using a method of colloid photodeposition operated presence hole scavenger (CPH). The Au supported TiO2 showed strong photoabsorption at around 550 nm due to surface plasmon resonance (SPR) exhibited photocatalytic activity mineralization formic acid aqueous suspensions under irradiation visible light (>ca. 520 nm). A linear correlation between amount loaded, that is, number nanoparticles, was observed, indicating Au/TiO2 plasmonic photocatalysts can be controlled simply by loading CPH external area is decisive factor irradiation. Very high reaction rates obtained samples with 5 wt % or more, although rate tended saturated. widely applied for various supports independent phase. CO2 formation also increased linearly increase Au. Interestingly, different slopes plots. slope important selection as material supporting colloidal nanoparticles.