Micropatterning and impedance characterization of an electrically percolating layer-by-layer assembly

作者：Everett W Neil; Jan C Jason; Sue H J; Grunlan Jaime C^*

来源：Electroanalysis, 2007, 19(9): 964-972.

DOI：10.1002/elan.200603811

• polyelectrolyte assembly
• carbon black
• conductive composite
• thin-film multilayer
• electric double layer capacitance

Micropatterned layer-by-layer (LbL) assemblies were studied as a potential platform for sensor applications by performing impedance characterization throughout a range of electrolyte concentrations. Conductive LbL thin films were prepared with carbon black nanoparticles dispersed in the polymer matrix to provide an electrically conductive network. LbL assemblies were micropatterned using a photolithographic lift-off method, and a test circuit was constructed as multiple interdigitating coplanar electrodes. Impedance spectra were collected between 10(4) and 10(6) Hz within a flow cell containing NaCl solutions ranging from 0.001 - 1.0 M. These preliminary results demonstrate the ability to pattern conductive LbL composites and underscore the potential utility and shortcomings of their use in sensor applications.

• 出版日期2007-5