Plasmonic silver-based reversible photochromism in Ag+‒doped organomodified silicates-phosphotungstate hybrid films
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Data
2019-06-01
Autores
Noveletto, Julia Cristina
Ferreira-Neto, Elias Paiva [UNESP]
Gonçalves, Lidiane Patricia
Ullah, Sajjad [UNESP]
Donatti, Dario Antonio [UNESP]
Lima Ribeiro, Sidney José [UNESP]
Rodrigues-Filho, Ubirajara Pereira
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Resumo
We report novel Ag+‒doped ormosil-phosphotungstate (PW12O40 3−) hybrid films that exhibit reversible yellow photochromism based on the phosphotungstate-assisted photo-induced formation of silver nanoparticles (AgNPs) and their reversible oxidation back to Ag+ ions upon low temperature heating (60–80 °C). The sol-gel derived, dip-coated, hybrid films containing phosphotungstate anions and Ag+ ions exhibit yellow color upon UV exposure and become colorless upon simple heating. Using an array of complementary analytical techniques, we first present a detailed characterization of the prepared materials and then discuss the coloration/discoloration mechanism involved. The presence of both phosphotungstate and Ag+ ions inside the hybrid matrix is found to be imperative for achieving the photochromic behavior. Owing to the presence of AgNPs and their easily achievable coloration/discoloration, these hybrid films may find application in optical memory systems, band pass filters, non-linear optical devices, UV sensing and antibacterial coatings.
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Ag nanoparticles, Optical thin film, Photochromic, Plasmonic, Polyoxometalate, Sol-gel
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Optical Materials, v. 92, p. 233-242, 2019.