Scanning Probe Microscopy Studies of Isocyanide Functionalized Polyaniline Thin Films
We have used the technique of scanning probe microscopy to study the nanometer-scale structure of thin films of polyaniline and isocyanide functionalized polyaniline. Structural changes on the film surfaces were studied as a function of protonation in aqueous HC1, as well as exposure to Ir+ cations in solution. Film growth of pure polyaniline is in a layer-by-layer mode, with an intricate, nanometer-scale domain structure. Ir+ incorporation leaves this structure intact. Electropolymerized isocyanide functionalized films exhibited a highly oriented fibrous structure, with individual strands averaging 25 Å in diameter. Protonation of these films resulted in aggregation of these strands into elongated bundles of average diameter 200 Å. Incorporation of Ir+ cations into the film matrix produced an oriented, interlocking structure of polymer bundles of diameter 400 Å. We also discuss the relationship of the microscopic structure of these films to their macroscopic conductive properties.
KeywordsBundle Structure Helical Coil Polyaniline Film Polymer Strand Macroscopic Conductivity
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