(Invited) Plasmonic Photocatalysis and Near-Field Photocatalysis

作者：T. Tatsuma · 发表于：ECS Meeting Abstracts · 年份：2024 · DOI：10.1149/ma2024-02684810mtgabs

It is well known that finding of Honda-Fujishima effect1 opened up the way to semiconductor photocatalysis. The semiconductor photocatalysts, typically TiO2, are often modified with noble metal nanoparticles such as platinum as co-catalysts, for improvement of the photocatalytic activity. We modified TiO2 photocatalysts with plasmonic silver2 or gold3 nanoparticles and found that plasmon-induced charge separation (PICS) occurs at the metal-TiO2 interface.3,4 If a metal nanoparticle such as silver or gold is irradiated with light of the resonant wavelength, energetic electrons and holes are generated in the course of relaxation of the photoexcited plasmons. The electron can be injected into the conduction band of the TiO2 in contact with the resonant metal nanoparticle, and PICS is achieved (Figure 1a).3,4 We have applied PICS to visible-light-driven and NIR-light-driven photovoltaics and optoelectronic devices,3,4 photocatalysts,3,4 plasmonic chemical sensors,4 multicolor photochromic materials,2,4 and photo-morphing gels.4 For PICS, we can employ not only silver and gold nanoparticles, but also other plasmonic metal nanoparticles such as copper and plasmonic and electroconducting compound nanoparticles such as ITO. We have developed photovoltaic devices responsive to NIR light by coupling TiO2 with plasmonic ITO nanoparticles.5 If the plasmonic nanoparticles are morphologically or optically anisotropic, plasmonic electron oscillation is localized at certain resonance s...