IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Organic Films and Devices Thursday Sessions
       Session OF+EL+TF-ThA

Paper OF+EL+TF-ThA7
The Influence of Substrate Interactions on the Metallicity of Polyaniline Films*

Thursday, November 1, 2001, 4:00 pm, Room 131

Session: Electronic Properties of Organic Thin Films
Presenter: B. Xu, University of Nebraska, Lincoln
Authors: B. Xu, University of Nebraska, Lincoln
J. Choi, Louisiana State University
P.A. Dowben, University of Nebraska-Lincoln
Correspondent: Click to Email
Both Na doped and undoped short chain vapor deposited polyaniline (PANI) thin films were studied using angular-resolved photoemission spectrascopy (ARPES) and X-ray photoemission spectrascopy (XPS). Films, grown on two different substrates, Si and Au, using vapor deposition method show distinctly different properties. Some indication of preferential molecular orientation was observed for ultrathin film deposited on Au substrate, but not on the Si substrates. Clear indication of metallic character was observed for the undoped polyaniline films consistent with recent theory suggesting that for alignment of chain parallel with a metal substrate enhances metallicity. The polyaniline films became more insulating with sodium doping, suggesting that Na doping leads to an increase in insulating behavior that may due to the completion of band filling. @FootnoteText@ *Supported by the Office of Naval Research and the Nebraska Research Initiative.