Autor(es):
Goncalves, Lidiane Patricia ; Ferreira-Neto, Elias Paiva ; Ullah, Sajjad ; Souza, Luciana Valgas de ; Elguera Ysnaga, Orlando Armando ; Santos, Moliria Vieira dos [UNESP] ; Lima Ribeiro, Sidney Jose [UNESP] ; Rodrigues-Filho, Ubirajara Pereira
Data: 2018
Identificador Persistente: http://hdl.handle.net/11449/158478
Origem: Oasisbr
Assunto(s): Ormosil; Hybrid materials; Phosphotungstic acid; TiO2; Photochromism; Ormosil; Ormosil; Hybrid materials; Hybrid materials; Phosphotungstic acid; Phosphotungstic acid; TiO2; TiO2; Photochromism; Photochromism
Descrição
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Photochromic ormosil-phosphotungstate hybrid materials were prepared by immobilizing phosphotungstic acid, H3PW12O40, (HPW) in hybrid organic-inorganic ormosil matrices via sol-gel route, and the effect of addition of TiO2 nanoparticles (NPs) on the photochromic response of HPW was studied. For measurement of the photochromic response and the bleaching kinetics, the resulting sol-gel-derived ormosil-phosphotungstate hybrid materials with and without TiO2 NPs were coated as thin films on glass substrate by dip coating. The hybrid films were characterized by scanning electron microscopy, Fourier transform infrared absorption spectroscopy, Raman spectroscopy and X-ray fluorescence spectroscopy. The addition of small amounts of TiO2 was found to increase the photochromic response of the hybrid materials by as much as 277 % which is attributed to a possible interfacial electron transfer from the photoexcited TiO2 to HPW. These highly UV-sensitive coatings can find useful applications in UV dosimeters and smart windows. [GRAPHICS] .
Univ Sao Paulo, Escola Engn Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil
Univ Peshawar, Inst Chem Sci, Peshawar 25120, Pakistan
Univ Estadual Paulista, Inst Quim, BR-14801970 Araraquara, Brazil
Univ Estadual Paulista, Inst Quim, BR-14801970 Araraquara, Brazil
FAPESP: 2011/08120-0
