Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 159, Issue 10, Pages H811-H815Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.044210jes
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Funding
- European Union through the EFRE program
- Investitionsbank Berlin (IBB) through the ProFIT program (LiquiRAS) [10144387]
- Senatsverwaltung fur Wirtschaft, Technologie und Forschung des Landes Berlin
- Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie
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Polarized infrared reflection measurements in an ellipsometric set-up and reflectance anisotropy spectroscopy (RAS) were used for the first time for combined in-situ characterization of the electrochemical growth (potentiostatic pulse method) of thin polypyrrole (PPy) films on Si(110). Both methods can monitor material and thickness related changes during deposition and are shown as sensitive tools for studying time development of PPy growth under varying potential. In detail polarized infrared spectroscopy delivered information on the chemical structure of the as-deposited film and RAS gave information on the quality of the interface and deposition rate. The identified polymerisation mechanism is in agreement with literature and valid for all times of deposition. For deposited films rough surfaces and partially inhomogeneous thicknesses (35 +/- 10 nm and 120 +/- 10 nm) were found. At present state it is not possible to simulate the in-situ RAS and IR-spectra in simple coherent optical layer models. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.044210jes] All rights reserved.
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