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      The resistance of polyelectrolyte multilayers in a free-hanging configuration.

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          Abstract

          The resistivity ρ(PEM) of polyelectrolyte multilayers (PEMs), PEI(PSS/PAH)(24), PEI(PGA/PAH)(12), PEI(HA/PLL)(12) and PEI(PSS/PLL)(12), in a free-hanging configuration was estimated combining electrochemical impedance spectroscopy (EIS) and atomic force microscopic (AFM) images. Surprisingly, the obtained value of several kΩcm is at least 6 orders of magnitude lower than that reported previously, where the resistivity was determined in the conventional PEM-on-electrode system. The significant discrepancy indicates the unexpectedly low electrical PEM resistance in the absence of redox-active ions and the sensitivity limitation in the conventional system.

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          Author and article information

          Journal
          J Phys Chem B
          The journal of physical chemistry. B
          American Chemical Society (ACS)
          1520-5207
          1520-5207
          Nov 11 2010
          : 114
          : 44
          Affiliations
          [1 ] Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland. sugihara@biomed.ee.ethz.ch
          Article
          10.1021/jp107362y
          20961140
          57ec601e-9ea2-4a00-912d-d3af08e66805
          History

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