Photoinduced structural transformations of Au-As2S3 nanocomposite impregnated in silica porous glass matrix

Alkhalil, George and Burunkova, Julia A. and Csík, Attila and Döncző, Boglárka and Szarka, Máté and Petrik, Péter and Kökényesi, Sándor Jenő and Saadaldin, Nasser (2023) Photoinduced structural transformations of Au-As2S3 nanocomposite impregnated in silica porous glass matrix. JOURNAL OF NON-CRYSTALLINE SOLIDS, 610. ISSN 0022-3093

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Abstract

This article investigates the photoinduced changes (PICs) in the optical properties of As2S3 impregnated in porous glasses (PGs) and the influence of gold nanoparticles (AuNPs). The composite material was obtained via a simple chemical deposition method where As2S3 powder was dissolved in an amine solution and impregnated into PG pieces, with and without the addition of AuNPs. Using Fourier-transform infrared spectroscopy, it was confirmed that, when mixing solutions of As2S3 and AuNPs they interact and form complexes that result in the plasmonic resonance suppression of AuNPs. Upon irradiation using green laser (532 nm) a significant increase in the bandgap energies of the samples was observed. This effect was studied using Raman spectroscopy. Moreover, it was noticed that the change in the bandgap energy depends on the As2S3 concentration and is reduced by the presence of AuNPs.

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