Please use this identifier to cite or link to this item:
|Title:||In situ XPS study of thermally deposited aluminum on chemically synthesized polypyrrole films||Authors:||Lim, V.W.L.
|Issue Date:||30-Sep-1999||Citation:||Lim, V.W.L., Li, S., Kang, E.T., Neoh, K.G., Tan, K.L. (1999-09-30). In situ XPS study of thermally deposited aluminum on chemically synthesized polypyrrole films. Synthetic Metals 106 (1) : 1-11. ScholarBank@NUS Repository. https://doi.org/10.1016/S0379-6779(99)00112-5||Abstract:||X-ray photoelectron spectroscopy was employed for the in situ study of the interactions between thermally deposited aluminum and the chemically synthesized polypyrrole film in its salt and partially undoped/deprotonated forms. Changes in the N(1s), S(2p) and Al(2p) core-level signals, as well as changes in surface elemental stoichiometries, were carefully monitored. It was found that the incoming aluminum atoms reacted initially with the dopant molecules of the film to form a salt. The undoping process was accompanied by an increase in the intrinsic oxidation state ([ = N-]/[-NH-] ratio) of the polymer to that generally observed in the completely undoped or 25% deprotonated polymer. The intrinsic oxidation state, however, started to fall at high aluminum loading. Furthermore, the migration of bulk adsorbed oxygen to the surface in response to the Al deposition process resulted in an increase in oxygen concentration at the metal/polymer interface. The formation of the N-π-AlOx complex disrupted the π-electron conjugation in the imine units and reduced the imine site to a state equivalent to that of the amine structure, causing the observed decrease in the intrinsic oxidation state of the polymer.||Source Title:||Synthetic Metals||URI:||http://scholarbank.nus.edu.sg/handle/10635/92050||ISSN:||03796779||DOI:||10.1016/S0379-6779(99)00112-5|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Nov 19, 2019
WEB OF SCIENCETM
checked on Nov 11, 2019
checked on Oct 26, 2019
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.