Self-assembled multilayer films based on a Keggin-type polyoxometalate and polyaniline
Multilayer ultrathin films were fabricated from partially doped polyaniline (PAN) and a Keggin-type polyoxometalate [ α-SiW 12O 40] 4− ( α-SiW 12) in aqueous solution via the layer-by-layer self-assembly technique and characterized by UV–vis, FTIR, and X-ray photoelectron spectra (XPS), ellipsometry...
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Published in | Journal of colloid and interface science Vol. 264; no. 1; pp. 176 - 183 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
San Diego, CA
Elsevier Inc
01.08.2003
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Multilayer ultrathin films were fabricated from partially doped polyaniline (PAN) and a Keggin-type polyoxometalate [
α-SiW
12O
40]
4− (
α-SiW
12) in aqueous solution via the layer-by-layer self-assembly technique and characterized by UV–vis, FTIR, and X-ray photoelectron spectra (XPS), ellipsometry, scanning electron microscopy (SEM), and atomic force microscopy (AFM). UV–vis spectroscopy shows that the absorbance values at characteristic wavelengths of the multilayer films increase almost linearly with the number of PAN/
α-SiW
12 bilayers, suggesting that the deposition process is regular and highly reproducible from layer to layer. FTIR and XPS spectra confirm the incorporation of
α-SiW
12 and PAN into the films. Ellipsometric measurements show that the PAN/
α-SiW
12 bilayer thickness increases with the increasing PAN solution concentration. SEM and AFM images indicate that the film surface is relatively uniform and smooth. In addition, the electrical conductivities of the multilayer films doped with hydrochloric acid were also measured. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0021-9797 1095-7103 |
DOI: | 10.1016/S0021-9797(03)00392-8 |