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Electrochemical quartz crystal microbalance study of polyelectrolyte film growth under anodic conditions
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2013 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 280, 783-790 p.Article in journal (Refereed) Published
Abstract [en]

Coating hard materials such as Pt with soft polymers like poly-l-lysine is a well-established technique for increasing electrode biocompatibility. We have combined quartz crystal microgravimetry with dissipation with electrochemistry (EQCM-D) to study the deposition of PLL onto Pt electrodes under anodic potentials. Our results confirm the change in film growth over time previously reported by others. However, the dissipation data suggest that, after the short initial phase of the process, the rigidity of the film increases with time, rather than decreasing, as previously proposed. In addition to these results, we discuss how gas evolution from water electrolysis and Pt etching in electrolytes containing Cl- affect EQCM-D measurements, how to recognize these effects, and how to reduce them. Despite the challenges of using Pt as an anode in this system, we demonstrate that the various electrochemical processes can be understood and that PLL coatings can be successfully electrodeposited. 

Place, publisher, year, edition, pages
2013. Vol. 280, 783-790 p.
Keyword [en]
Quartz crystal microgravimetry, QCM, Electrochemistry, Poly-L-lysine, Platinum electrode, Film growth
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-204815DOI: 10.1016/j.apsusc.2013.05.062ISI: 000321045700117OAI: oai:DiVA.org:uu-204815DiVA: diva2:640381
Available from: 2013-08-13 Created: 2013-08-12 Last updated: 2013-08-13Bibliographically approved

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Björefors, Fredrik
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