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- W2070291360 endingPage "1387" @default.
- W2070291360 startingPage "1379" @default.
- W2070291360 abstract "The characterization of thin, polystyrene (PS) coatings (molecular weight ca. 90 000, up to 30 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 Au substrates 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 number of 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 been found, based on the observed dependence of the coating density, thickness, and degree of Au coverage on the PS deposition time." @default.
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- W2070291360 date "1999-12-04" @default.
- W2070291360 modified "2023-10-11" @default.
- W2070291360 title "Properties of Thin Polystyrene Films Prepared on Gold Electrodes by the Dip-Coating Method" @default.
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- W2070291360 doi "https://doi.org/10.1021/la9907735" @default.
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