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Titolo:
Semiconductor-metal composite nanostructures. To what extent do metal nanoparticles improve the photocatalytic activity of TiO2 films?
Autore:
Subramanian, V; Wolf, E; Kamat, PV;
Indirizzi:
Univ Notre Dame, Dept Chem Engn, Notre Dame, IN 46556 USA Univ Notre DameNotre Dame IN USA 46556 em Engn, Notre Dame, IN 46556 USA Univ Notre Dame, Notre Dame Radiat Lab, Notre Dame, IN 46556 USA Univ Notre Dame Notre Dame IN USA 46556 iat Lab, Notre Dame, IN 46556 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 46, volume: 105, anno: 2001,
pagine: 11439 - 11446
SICI:
1520-6106(20011122)105:46<11439:SCNTWE>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
RUTHENIUM POLYPYRIDYL COMPLEX; SOLAR-ENERGY CONVERSION; TEXTILE AZO-DYE; GOLD NANOPARTICLES; THIN-FILMS; PHOTOELECTROCHEMICAL BEHAVIOR; SILVER PARTICLES; CHARGE-TRANSFER; VISIBLE-LIGHT; PHOTOCHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
72
Recensione:
Indirizzi per estratti:
Indirizzo: Kamat, PV Univ Notre Dame, Dept Chem Engn, Notre Dame, IN 46556 USA Univ Notre Dame Notre Dame IN USA 46556 otre Dame, IN 46556 USA
Citazione:
V. Subramanian et al., "Semiconductor-metal composite nanostructures. To what extent do metal nanoparticles improve the photocatalytic activity of TiO2 films?", J PHYS CH B, 105(46), 2001, pp. 11439-11446

Abstract

Noble metal particles of Au, Pt, and Ir were deposited on nanostructured TiO2,film using an electrophoretic approach. The nanocomposite films were characterized by UV-absorption and atomic force microscopy (AHA). The deposition of tetraoctylammonium bromide (TOAB)-capped metal nanoparticles on TiO2films improved the photocurrent generation and induced a shift in the apparent flat band potential. The TiO2 films modified with TOAB-capped metal nanoparticles were less prone to the electron scavenging by the oxygen in solution. Improved photoelectrochernical performance of semiconductor-metal composite film is attributed to the shift in quasi-Fermi level of the composite to more negative potentials. Continuous irradiation of the composite films over a long period causes photocurrent to decrease as the semiconductor-metal interface undergoes chemical changes. The role of semiconductor-metalcomposite films in improving the rate of photocatalytic degradation of an azo dye is also discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 01:26:24