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Titolo:
Monomer-dimer equilibrium of rhodamine B encapsulated in Si-Al and Si-Ti binary-oxide thin films
Autore:
Nishikiori, H; Tanaka, N; Fujii, T;
Indirizzi:
Shinshu Univ, Fac Engn, Dept Environm Sci & Technol, Nagano 3808553, JapanShinshu Univ Nagano Japan 3808553 m Sci & Technol, Nagano 3808553, Japan
Titolo Testata:
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
fascicolo: 1, volume: 20, anno: 2001,
pagine: 95 - 104
SICI:
0928-0707(200101)20:1<95:MEORBE>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOL-GEL METHOD; CHARGE-TRANSFER SENSITIZERS; ALUMINUM ALKOXIDE SYSTEMS; FLUORESCENCE-SPECTRA; XEROGEL TRANSITIONS; XANTHENE DYES; MOLECULAR-FORMS; MIXED ALUMINUM; CELL; 1-NAPHTHOL;
Keywords:
dip-coating; Si-Al binary-oxide thin film; Si-Ti binary-oxide thin film; Rhodamine B; electronic spectra;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Fujii, T Shinshu Univ, Fac Engn, Dept Environm Sci & Technol, Nagano 3808553, Japan Shinshu Univ Nagano Japan 3808553 echnol, Nagano 3808553, Japan
Citazione:
H. Nishikiori et al., "Monomer-dimer equilibrium of rhodamine B encapsulated in Si-Al and Si-Ti binary-oxide thin films", J SOL-GEL S, 20(1), 2001, pp. 95-104

Abstract

Si-Al and Si-Ti binary-oxide thin films including Rhodamine B (RB) have been prepared. They were dip-coated as a function of time after mixing of each sol-gel reaction system. The absorption and fluorescence spectra of the individual films have been observed. These spectra were analyzed in order toclarify the behavior of RB along with the change in the environment aroundthe RB molecules, caused by the progress of the sol-gel reaction, in the fluid sol and the prepared thin films. Some amount of the RB dimers (H- and J-types) were formed in the Si-Al and Si-Ti binary-oxide films (Si : M = 75: 25) prepared at the initial stage of the sol-gel reaction and aged underrelative humidity of 60%. In the case of Si-Al binary-oxide films, the amount of the J-dimer decreased along with the reaction time at which the films were prepared, indicating that growing polymer networks of metal alkoxides around the RB molecules prevent the formation of the J-dimer. On the other hand, larger amounts of the H- and J-dimers were formed in the Si-Ti binary-oxide films prepared at longer reaction time of the solution. RB interacts more strongly with -TiOH compared with -AlOH. In the case of the Si-Ti binary-oxide films, with the progress of the sol-gel reaction, RB molecules in the prepared films easily cohere around the -TiOH and form the dimers because of increase in the amount of the -TiOH and contraction in the volume of the spaces where RB molecules exist.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:54:09