[5p-A410-1~13] 4.1 Plasmonics

▲ [5p-A410-12] Improvement of Photocatalytic Efficiency by Adding Ag Nanoparticles and Reduced Graphene Oxide to TiO2

〇(M2)Yenshin Chen¹, Bokai Chao¹, Tadaaki Nagao², Chunhway Hsueh¹ (1.MSE, NTU, 2.MANA, NIMS)

Keywords:photocatalyst, nanostructures, plasmonics

Titanium dioxide (TiO2) is the commonly used photo- catalyst. However, because only a small ultraviolet portion of solar spectrum can excite the electron-hole pairs result- ing from the large band gap (3.2 eV) and the recombi- nation rate is high, its efficiency is restrained. To overcome this drawback, we added silver nanoparticles and reduced graphene oxide (RGO) to construct the ternary plasmonic catalyst to improve the catalytic performance of TiO2 na- nopowder (P25). We prepared three different geometries of Ag nanostructures including sphere, decahedron and prism because the plasmon resonance properties of Ag could be controlled by the morphology of Ag nanoparticle, which shows characteristic strong localized surface plasmon res- onance (LSPR) leading to an increase in light absorption. The incorporated RGO inhibited the charge recombina- tion and enhanced the electron-hole separation. In this study, Ag nanodecahedrons/P25/RGO and Ag nano- prisms/P25/RGO hybrid photocatalysts possessed remarka- ble photocatalytic activity, which displayed over 8 times higher photocatalytic efficiency than the P25 photocatalyst.