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Photo- and Thermally Induced Effects in an As2S3 + Au/Polymer Nanocomposite
Russian version
Zedomi T.E.1, Kotova L.V. 1,2, Fedorov D.L.2, Komarova O.S.2, Burunkova J.E.3, Tarasov V.E.3, Kocherushko V.P.1
1Ioffe Institute, St. Petersburg, Russia
2Baltic State Technical University "VOENMEKH" named after Marshal D. F. Ustinov, St. Petersburg, Russia
3ITMO University, St. Petersburg, Russia
Email: kotova@mail.ioffe.ru
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This paper investigates the optical properties of nanocomposites consisting of As2S3 nanocrystals with added Au nanoparticles embedded in a polymer matrix based on acrylic monomers. The aim of the study is to analyze photo- and thermally induced changes in the transmittance spectra in the visible and near-IR ranges and to identify the mechanisms responsible for these effects. The experimental methodology includes the synthesis of composites by mixing solutions of As2S3 and Au nanoparticles, followed by polymerization, transmission spectral measurements, and analysis of the Urbach absorption edge. Key results demonstrate opposite trends compared to bulk As2S3 films: thermal darkening and a long-wavelength shift of the absorption edge after thermal annealing (up to 150 oC), as well as a converse photoinduced shift to short wavelengths upon irradiation with a 532 nm laser (power of 20 W/cm2). The addition of Au enhances these effects due to plasmonic interactions. The obtained results open up prospects for the application of such composites in optoelectronics, holography, and devices with controlled optical properties. Keywords: nanocomposites, nanocrystals, polymer, controlled optical properties.
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