Sl. Sin et al., ESCA and TOF-SIMS study on oxidised and reduced polypyrrole-poly(4-styrenesulfonate) free-standing films synthesized on Ti electrodes, ELECTROCH C, 2(10), 2000, pp. 685-691
Thin films of polypyrrole, composited with poly(4-styrenesulfonate), formed
electrochemically on titanium plate electrodes could be peeled off readily
as free standing films, before and after reduction in the aqueous forming
solution. Both surfaces (electrolyte side and electrode side) of such free
standing films had been investigated using electron spectroscopy for chemic
al analysis (ESCA) and time of flight secondary ion mass spectrometry (TOF-
SIMS). The morphologies for the electrolyte sides of both oxidized and redu
ced forms of such polypyrrole composite films were clearly different from t
hose of the electrode sides, but little difference in surface conductivity
between the two sides of each form was detectable using the four-point prob
e technique. ESCA spectra showed high sodium ion presence on the surfaces o
f the reduced form but not detectable on the surfaces of the oxidized form.
Secondary electron images and ion maps of sampled areas on the films from
the TOF-SIMS study revealed some interesting surface features. (C) 2000 Els
evier Science S.A. All rights reserved.