Effects of addition of poly(ethylene glycol) on the formation of anatase nanocrystals in SiO2-TiO2 gel films with hot water treatment

Citation
Y. Kotani et al., Effects of addition of poly(ethylene glycol) on the formation of anatase nanocrystals in SiO2-TiO2 gel films with hot water treatment, CHEM MATER, 13(6), 2001, pp. 2144-2149
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
0897-4756 → ACNP
Volume
13
Issue
6
Year of publication
2001
Pages
2144 - 2149
Database
ISI
SICI code
0897-4756(200106)13:6<2144:EOAOPG>2.0.ZU;2-1
Abstract
Effects of the addition of poly(ethylene glycol) (PEG) in SiO2-TiO2 gel fil ms on the formation of anatase nanocrystals with hot water treatment were i nvestigated. Anatase nanocrystals were formed in the whole SiO2-TiO2 gel fi lms with the addition of PEG by the! treatment, whereas in the films withou t PEG the nanocrystals were formed mainly on the surface of the films. PEG in the SiO2-TiO2 films was completely leached out with the hot water treatm ent in about 1 min. The pores produced by the leaching of PEG probably allo w anatase nanocrystals to be formed inside the films. Hydrolysis of Si-O-Ti bonds was presumed to play an important role in the nucleation of anatase nanocrystals in the hot water treatment.