Burying small Pt nanoparticles in the TiO2 microsphere support to form visible light antenna-reactor photocatalysts

By rational design and parameter engineering of the TiO2-Pt core-satellite construction, visible light absorption in small Pt nanoparticles (NPs) can be enhanced by nearly 100 times. The TiO2 microsphere support works as the optical antenna, giving rise to superior performance compared to conven-tional plasmonic nanoantennas. A crucial step is to bury the Pt NPs completely in the high refractive index TiO2 micro -sphere, because light absorption in the Pt NP approximately scales with the fourth power of the refractive index of its surrounding media. The proposed evaluation factor for light absorption enhancement in the Pt NPs at different positions is proved to be valid and useful. The physics modeling of the buried Pt NPs corresponds to the general case in prac-tice where the surface of the TiO2 microsphere is naturally rough or a thin TiO2 coating is subsequently added. These results offer new avenues for directly transforming dielec-tric supported nonplasmonic catalytic transition metals into visible light photocatalysts. (c) 2022 Optica Publishing Group

Automated summary

By rational design and parameter engineering of the TiO2-Pt core-satellite construction, visible light absorption in small Pt nanoparticles can be enhanced by nearly 100 times. A crucial step is to bury the Pt NPs completely in the high refractive index TiO2 microsphere, and the proposed evaluation factor for light absorption enhancement in the Pt NPs is proved to be valid and useful. These findings provide new possibilities for transforming nonplasmonic catalytic transition metals into visible light photocatalysts.