| Texto completo | |
| Autor(es): |
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]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Optical Materials; v. 92, p. 233-242, JUN 2019. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 18/01934-0 - Aerogéis de dissulfetos de metais de transição e celulose bacteriana: nanomateriais bifuncionais com propriedades fotocatalíticas e adsortivas para aplicações ambientais |
| Beneficiário: | Elias Paiva Ferreira Neto |
| Linha de fomento: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 15/22875-4 - Desenvolvimento de fotocatalisadores sensíveis a radiação infravermelho/visível para aplicações fotocatalíticas empregando luz solar |
| Beneficiário: | Sajjad Ullah |
| Linha de fomento: | Bolsas no Brasil - Pós-Doutorado |