Intrinsic redox states of polyaniline studied by high-resolution X-ray photoelectron spectroscopy |
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| Authors: | Yongjun Chen E. T. Kang K. G. Neoh S. L. Lim Z. H. Ma K. L. Tan |
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| Affiliation: | (1) Department of Chemical Engineering National University of Singapore Kent Ridge, Singapore 119260 e-mail: cheket@nus.edu.sg Fax: +65-779 1936, SG;(2) Department of Physics National University of Singapore Kent Ridge, Singapore 119260, SG |
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| Abstract: | High-resolution X-ray photoelectron spectroscopic (XPS) measurements of the various intrinsic redox states of polyaniline (PANI), using a monochromatized Al—Kα source, were carried out. The presence of the imine, amine and positively charged nitrogen species corresponding to a particular intrinsic redox state and protonation level of the polymer was resolved quantitatively and unambiguously. The result confirmed the peak assignments of former XPS core-level studies using the lower resolution non-monochromatized Mg—Kα X-ray source. Thus, the high-resolution XPS using a monochromatized Al—Kα X-ray source is a truly unique tool for the convenient and quantitative analysis of the various intrinsic redox states of PANI. Received: 16 May 2000/Accepted: 29 August 2000 |
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| Keywords: | Polyaniline XPS High-resolution Oxidation states Protonation |
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