PROPERTIES OF Ag/TiO2 AND Ag/SiO2 NANOPARTICLES AND THEIR EFFECT ON THE PHOTOCATALYTIC PROPERTIES OF A SEMICONDUCTOR NANOCOMPOSITE

I. Sharapov; G. Omarova; A. Sadykova; E. Seliverstova

doi:10.31489/2025N2/25-32

Authors

DOI:

https://doi.org/10.31489/2025N2/25-32

Keywords:

plasmon, nanoparticles, optical properties, photocatalysis, nanocomposite

Abstract

The optical properties and the electric field distribution around silver nanoparticles coated with TiO₂ or SiO₂ shell have been studied. It is demonstrated that the presence of a shell around a plasmonic nanoparticle leads to a bathochromic shift in the maximum of its absorption band. The maximum electric field intensity around metal nanoparticles is radially concentrated, predominantly near the surface of the nanoparticles. The quantum efficiency, representing the ratio of emitted photons to absorbed photons, is nearly 50% higher for Ag/TiO₂ nanoparticles compared to Ag/SiO₂. In the presence of Ag/TiO₂ and Ag/SiO₂ core/shell nanoparticles the photocatalytic activity of the TiO₂/rGO nanocomposite increases by 2.7 and 1.7 times, respectively. These changes are associated with improved charge transport properties of TiO₂/rGO and possible hot electron injection from the nanoparticles into the semiconductor.

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PROPERTIES OF Ag/TiO2 AND Ag/SiO2 NANOPARTICLES AND THEIR EFFECT ON THE PHOTOCATALYTIC PROPERTIES OF A SEMICONDUCTOR NANOCOMPOSITE