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Electrochemical quartz crystal microbalance study of polyelectrolyte film growth under anodic conditions
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
Uppsala University, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2773-5096
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
Elsevier , 2013. Vol. 280, 783-790 p.
Keyword [en]
Quartz crystal microgravimetry, QCM, Electrochemistry, Poly-L-lysine, Platinum electrode, Film growth
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-95934DOI: 10.1016/j.apsusc.2013.05.062ISI: 000321045700117OAI: diva2:641775

Funding Agencies|Swedish Research Council (Vetenskapsradet)|325-2008-7537621-2007-3983|Bo Liedberg and the Molecular Physics Group at Linkoping University for access to equipment||Carl Trygger Foundation and The Swedish Foundation for Strategic Research||

Available from: 2013-08-19 Created: 2013-08-12 Last updated: 2015-06-15
In thesis
1. Electrodes and Electrokinetic Systems for Biotechnological Applications
Open this publication in new window or tab >>Electrodes and Electrokinetic Systems for Biotechnological Applications
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Research in bioelectronics studies biological systems and materials in combination with electronic interfaces for the development of devices, e.g., for medical applications, drug and toxicity tests, and biotechnology in general. Neural implants and pacemakers are examples of products developed from this area of research. Conducting polymers such as poly(3,4-ethylenedioxythiophene) (PEDOT) bridge biology and electronics with a combination of biocompatibility, flexibility, and capability to themselves undergo redox reactions. Electrokinetics, a related branch of science, describes the motion of fluids and particles caused by the application of an electric field, and includes various separation techniques such as gel electrophoresis. Applying an electric field in a sufficiently small diameter silica capillary can cause the liquid in the capillary to move. This phenomenon, referred to as electroosmosis, plays an important role in miniaturized microfluidic systems and can be used to drive flow in a so-called electroosmotic pump.

This thesis describes research at the interface between biology, chemistry and electronics. The first two papers probe the adsorption mechanism of poly-L-lysine, often used in biotechnological applications, onto hard materials such as metals (platinum) and metal oxides (indium tin oxide). By employing a gravimetric technique, quartz crystal microgravimetry with dissipation monitoring (QCM-D) combined with electrochemistry, we studied the process by which poly-L-lysine is deposited onto two different conducting substrates under anodic conditions. We found that indium tin oxide is more suitable than platinum for anodic electrodeposition of PLL, however, the exact film deposition mechanism is not fully understood. Paper 3 demonstrates the applicability of using conducting polymers, (e.g., PEDOT) instead of platinum as electrode material in gel electrophoresis. The last paper describes the fabrication and characterization of an electroosmotic pump consisting of a potassium silicate stationary phase in a fused silica capillary and the integration of the pump into a system for use, e.g., as a bioreactor.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 47 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1682
National Category
Chemical Sciences Chemical Engineering
urn:nbn:se:liu:diva-119364 (URN)10.3384/diss.diva-119364 (DOI)978-91-7519-033-4 (print) (ISBN)
Public defence
2015-07-07, Planck, Fysikhuset, Campus Valla, Linköping, 10:15 (Swedish)
Available from: 2015-06-15 Created: 2015-06-15 Last updated: 2015-06-15Bibliographically approved

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