AVS 45th International Symposium
    Applied Surface Science Division Wednesday Sessions
       Session AS-WeA

Paper AS-WeA8
XPS Evidence of Redox Chemistry Between Cold Rolled Steel and Polyaniline

Wednesday, November 4, 1998, 4:20 pm, Room 307

Session: Polymer Surfaces, Films and Interfaces
Presenter: B.C. Beard, Akzo Nobel Chemicals, Inc.
Authors: B.C. Beard, Akzo Nobel Chemicals, Inc.
P. Spellane, Akzo Nobel Chemicals, Inc.
Correspondent: Click to Email
The electrochemical response of polyaniline (PANI) in its undoped intermediate (emeraldine base, EB) oxidation state coated on cold rolled steel (CRS) or glass substrates has been evaluated by xray photoelectron spectroscopy (XPS). The oxidation state of the polymer was determined from the ratio of amine to imine nitrogen chemical states observed in the N(1s) photoelectron spectrum. A room temperture air dried PANI coating cast from NMP solution onto CRS was found to be reduced relative to its as-synthesized, air stable state. Heating the PANI coated on CRS in the absence of air (165°C, in ultra high vacuum) produced an even deeper reduction, resulting from the transfer of electronic charge to the polymer from the metal substrate. Subsequent brief exposure of this reduced PANI coating to air at elevated temperature (165°C) reoxidized the PANI to the EB state. Analogous treatment of a PANI coating on glass caused no such change in oxidation state of the polymer. Unlike steel which provides a redox couple with PANI, glass is electro-inactive.