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Electrochemically induced morphology and volume changes in surface-grafted poly(ferrocenyldimethylsilane) monolayers
Mária Péter1, Mark A Hempenius, E Stefan Kooij
1MESA+ Research Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 19, 2005
Summary
Redox-active poly(ferrocenyldimethylsilanes) form self-assembled monolayers on gold. Electrochemical control reveals reversible polymer chain stretching and thickness changes up to 15% due to oxidation and ion interactions.
Area of Science:
- Polymer Chemistry
- Electrochemistry
- Surface Science
- Nanotechnology
Background:
- Poly(ferrocenyldimethylsilanes) are redox-active polymers with potential in electronic and sensing applications.
- Self-assembly of polymers onto surfaces is crucial for creating functional interfaces.
Purpose of the Study:
- To investigate the electrochemical behavior and structural changes of poly(ferrocenyldimethylsilanes) in self-assembled monolayers.
- To correlate in situ electrochemical stimuli with monolayer morphology and thickness variations.
Main Methods:
- Self-assembly of thiol-terminated polymers onto gold surfaces.
- Electrochemical Atomic Force Microscopy (EC-AFM) for in situ morphology studies.
- Surface Plasmon Resonance (SPR) and Spectroscopic Ellipsometry for thickness measurements.
- X-ray reflectivity (XRR) for detailed structural analysis.
Main Results:
- Formation of redox-active monolayers of poly(ferrocenyldimethylsilanes) on gold.
- Observation of reversible thickness changes up to 15% upon electrochemical oxidation and reduction.
- Demonstration of polymer chain stretching and counter-ion/solvent interactions influencing monolayer thickness.
Conclusions:
- Electrochemical oxidation induces polymer chain stretching and ion/solvent incorporation, increasing monolayer thickness.
- Electrochemical reduction reverses these changes, leading to a more compact film.
- These findings highlight the potential for electrochemically tunable polymer monolayers.