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Titolo:
Properties of thin polystyrene films prepared on gold electrodes by the dip-coating method
Autore:
Xia, SJ; Liu, G; Birss, VI;
Indirizzi:
Univ Calgary, Dept Chem, Calgary, AB T2N 1N4, Canada Univ Calgary CalgaryAB Canada T2N 1N4 Chem, Calgary, AB T2N 1N4, Canada
Titolo Testata:
LANGMUIR
fascicolo: 3, volume: 16, anno: 2000,
pagine: 1379 - 1387
SICI:
0743-7463(20000208)16:3<1379:POTPFP>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELF-ASSEMBLING MONOLAYERS; QUARTZ-CRYSTAL MICROBALANCE; ADSORPTION; IMPEDANCE; KINETICS; SURFACE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Birss, VI Univ Calgary, Dept Chem, 2500 Univ Dr NW, Calgary, AB T2N 1N4, Canada Univ Calgary 2500 Univ Dr NW Calgary AB Canada T2N 1N4 4, Canada
Citazione:
S.J. Xia et al., "Properties of thin polystyrene films prepared on gold electrodes by the dip-coating method", LANGMUIR, 16(3), 2000, pp. 1379-1387

Abstract

The characterization of thin, polystyrene (PS) coatings (molecular weight ca. 90 000, up to SO nm in thickness), deposited on polycrystalline Au surfaces, was carried out by using ellipsometry, mass measurements using the quartz crystal microbalance (QCMB) technique, and various electrochemical methods. The PS coatings were reproducibly deposited using a dip-coating technique, involving the immersion of the Au substrate for times ranging from 5 s to 2 h in 0.6-10 g of PS/(L of cyclopentane (CP)). The coverage of the Ausubstrates by PS in aqueous solutions, determined from the extent of suppression of the cyclic voltammetric (CV) response vs at bare electrodes, as well as from ac impedance measurements in pH 7 phosphate buffer and in pH 7 K4Fe(CN)(6) (1 mM) solutions, could be controllably varied from ca. 0.1 to 0.99 by the deposition conditions employed. With the time of potential cycling in aqueous solutions, the degree of blockage of the Au surfaces by these PS films decreases, likely due to the development of an increasing numberof defects in the coating and the consequent uptake of solution into the film. Evidence for the presence of both an inner and outer PS layer has beenfound, based on the observed dependence of the coating density, thickness,and degree of Au coverage on the PS deposition time.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 12:10:06