[16p-P05-1~20] 12.2 評価・基礎物性

英語発表

[16p-P05-3] Shape effect of plasmonic gold nanoparticle-decorated titanium dioxide
for photocatalytic activity

〇(M2)Naritsara Kornkanlaya¹, Junjuda Unruangsri¹, Sanong Ekgasit¹, Akira Baba², Kanet Wongravee¹ (1.Chulalongkorn Univ., 2.Niigata Univ.)

キーワード：

Au nanostructure、Titanium dioxide、Photocatalyst

The surface plasmon resonance (SPR) of plasmonic metal nanostructures plays a crucial role in enhancing optical and catalytic applications. In this study, gold nanoparticles (AuNPs) with three different shapes (nanosphere, nanorod, and nanostar) were decorated onto titanium dioxide (TiO₂) to investigate their shape-dependent effects on photocatalytic activity. The AuNPs were synthesized with plasmonic absorption in the 500-570 nm range and decorated on TiO₂ surface using a deposition-precipitation method with (3-mercaptopropyl)trimethoxysilane (MPTMS) as a linker, forming AuNPs/TiO₂-MPTMS composites. The photocatalytic activity was evaluated through the aerobic oxidation of benzyl alcohol under 300 W Xe lamp irradiation for 6 hours, with reaction products identified via HPLC analysis. The results indicated that AuNPs/TiO₂-MPTMS achieved 80% benzyl alcohol conversion. Furthermore, Au nanostar/TiO₂-MPTMS produced the highest yield of benzoic acid due to the intense electromagnetic field enhancements around the spikes of Au nanostar, which promoted efficient hot electron transfer across the interface between the Au nanostar spikes and TiO₂.