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|Title:||Surface studies of chemically processed polyaniline films||Authors:||Kang, E.T.
|Issue Date:||Feb-1993||Citation:||Kang, E.T.,Neoh, K.G.,Woo, Y.L.,Tan, K.L.,Huan, C.H.A.,Wee, A.T.S. (1993-02). Surface studies of chemically processed polyaniline films. Synthetic Metals 53 (3) : 333-345. ScholarBank@NUS Repository.||Abstract:||Surface structures and redox states of pristine, protonated and surface modified emeraldine (EM) films have been studied by angle-dependent X-ray photoelectron spectroscopy (XPS). The first protonation-deprotonation cycle can increase the intrinsic oxidation state (imine/ amine ratio) of EM to near that of pernigraniline. The outermost surface of the EM film generally has a significantly lower intrinsic oxidation state than the bulk. In contrast to protonation by volatile acids, the outermost surface of EM film protonated by a non-volatile acid can exhibit a significantly higher protonation level and almost all the amine nitrogens, in addition to the imine nitrogens, are susceptible to protonation. The pristine, O3-pretreated and once-cycled (acid-base) EM films also exhibit distinctive behaviour towards surface modifications by near-UV light induced graft copolymerization with hydrophilic polymers. The surface characteristics, including morphology, of the three types of films after grafting are also reported. © 1993.||Source Title:||Synthetic Metals||URI:||http://scholarbank.nus.edu.sg/handle/10635/91738||ISSN:||03796779|
|Appears in Collections:||Staff Publications|
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