Ag/grapheme/Tio_2複合奈米棒應用於表面電漿光觸媒反應

Ag/graphene/TiO_2 Composite Nanorods for Plasmonic Photocatalytic Reaction

黃鴻基(Hung Ji Huang) ； 鄭仕元(Shi-Yuan Zhen) ； 李秉宇(Ping-Yu Li) ； 曾賢德(Shien-Der Tzeng) ； 江海邦(Hai-Pang Chiang)

《科儀新知》 212期 (2017/09) Pp. 66-72

摘要

在銀－石墨烯－二氧化鈦奈米複合粒子上，外加光激發高能量熱電子的流向會影響光觸媒的水處理反應效率。高能量熱電子會把水中的氧氣O_2轉換產生*O_2^-活性基，而*O_2^-是氧化降解水中有機物的重要活性基，其導引傳輸至水中的輸出效率會影響光觸媒反應之操作效率。外加激發光會在二氧化鈦上誘發產生分離的高能量熱電子與熱電洞，但是因為電性互相吸引，容易產生電子電洞複合而轉變成其他形式能量散失。石墨烯中介層的能階位置低於奈米銀粒子與二氧化鈦，因此可以強化導引外加照射光所轉換產生的高能量熱電子，使甲基藍在此光觸媒降解之反應效率提高。

並列摘要

Hot electrons is generated in nanorods of layered Ag/graphene/TiO_2 structure with high efficiency and presented to enhance plasmonic photocatalytic water treatment. The high-energy hot electrons generate under external light-illumination on titanium dioxide (TiO_2) nanoparticles lead to the conversion of oxygen molecule (O_2) to the highly-active superoxide radical (*O_2^-) that leads to the degradation of organics in water. However, the generated hot electrons tend to recombine with the simultaneously generated hot holes and convert to wasted energy. Graphene has lower energy level than Ag and TiO_2, and can keep the generated hot electrons from recombination with the generated hot holes. The experimental results of photocatalytic degradation of methyl blue presented the enhanced processing efficiency with the introduction of graphene layer.