Scanning Probe Microscopy Studies of Isocyanide Functionalized Polyaniline Thin Films

  • Timothy L. Porter
  • Andrew G. Sykes


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.


Bundle Structure Helical Coil Polyaniline Film Polymer Strand Macroscopic Conductivity 


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  1. 1.
    P. Adams and A.P. Monkman, Observed anisotropies in stretch oriented polyaniline, Synthetic Metals, 41: 627–633 (1991).CrossRefGoogle Scholar
  2. 2.
    G. Caple, C.Y Lee, T.L. Porter, and P.I. Oden, Surface structural study of poly-hydroxy-aniline and aniline-(3-aminophenylboronic acid) co-polymer films, J. Vac. Sci. Technol. A10 (4): 606–610 (1992).CrossRefGoogle Scholar
  3. 3.
    A.J. Epstein, M.E. Jozefowicz, A.G. MacDiannid, J.P. Pouget, X Tang, X-ray structure of polyaniline, Macromolecules, 24: 779–789 (1991).CrossRefGoogle Scholar
  4. 4.
    K. Caple, G. Caple, T.L. Porter, Surface structure of free-standing polyaniline thin films, Synthetic Metals, 60: 211–214 (1993).CrossRefGoogle Scholar
  5. 5.
    G. Caple, T.R. Dillingham, T.L. Porter, Y Shi, A.G. Sykes, Electropolymerized films of isocyanide functionalized andines: coordination of a heavy metal cation, J. Electroanal. Chem., 380: 139–145 (1995).CrossRefGoogle Scholar
  6. 6.
    A.J. Epstein, C. Li, A.G. MacDialmid, E. M. Sehen, Z.H. Wang, Three dimensionality of metallic states in conducting polymers: polyaniline, Physical Review Letters, 66: 1745–1748 (1991).CrossRefGoogle Scholar
  7. 7.
    G. Caple, C.Y. Lee, T.L. Porter, B.L. Wheeler, Scanning tunneling microscopy studies of substituted polyaniline thin films, J. Vac. Sci. Technol., A9 (3): 1452–1456 (1991).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Timothy L. Porter
    • 1
  • Andrew G. Sykes
    • 2
  1. 1.Department of PhysicsNorthern Arizona UniversityFlagstaffUSA
  2. 2.Department of ChemistryNorthern Arizona UniversityFlagstaffUSA

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