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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Plasmonic silver-based reversible photochromism in Ag+-doped organomodified silicates-phosphotungstate hybrid films

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Noveletto, Julia Cristina [1] ; Ferreira-Neto, Elias Paiva [2] ; Goncalves, Lidiane Patricia [1] ; Ullah, Sajjad [2, 3] ; Donatti, Dario Antonio [4] ; Lima Ribeiro, Sidney Jose [2] ; Rodrigues-Filho, Ubirajara Pereira [1]
Total Authors: 7
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Estadual Paulista, Inst Quim, UNESP, BR-14800060 Araraquara, SP - Brazil
[3] Univ Peshawar, Inst Chem Sci, Peshawar 25120, KP - Pakistan
[4] Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas Rio Claro, Dept Fis, UNESP, BR-13500970 Rio Claro, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Optical Materials; v. 92, p. 233-242, JUN 2019.
Web of Science Citations: 0

We report novel Ag+-doped ormosil-phosphotungstate (PW12O403-) 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 degrees 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. (AU)

FAPESP's process: 18/01934-0 - Aerogels based on transition metal disulfides and bacterial cellulose: bifunctional nanomaterials with photocatalytic and adsorptive properties for environmental applications
Grantee:Elias Paiva Ferreira Neto
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/22875-4 - Development of Efficient IR/Visible light-driven Photocatalysts for Photocatalytic Applications under Solar light radiation
Grantee:Sajjad Ullah
Support type: Scholarships in Brazil - Post-Doctorate