PC 19


D. Raisa, S. Nešpůreka, J. Hainb, A. Pichb, H.-J. Adlerb

a Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic (david.rais@atlas.cz)

bInstitute of Macromolecular Chemistry and Textile Chemistry, Dresden University of Technology, Mommsenstr. 4, D-01069 Dresden, Germany

Electrical properties of thin films prepared from particles consisting of polystyrene core and conductive polymer shell were investigated using both the 4-point probe technique and interdigital surface electrodes geometry. The spherical particles were with narrow size distribution. The comparison of electrical conductivities of polypyrrole coated particles prepared with four different oxidants (FeCl3, Na2S2O8, (NH4)2S2O8 and H3PMo12O40×29H2O) showed that the first three oxidants were effective in the polystyrene particles coating; the last one was not efficient. The activation energy of DC current for FeCl3 oxidized particles was determined as E = 0.16 eV in vacuum. Specific resistivities of drop casted film were ca. 33 Wm.

The changes in the resistivity induced by humidity changes were quite small. DC resistance of conductive films increased with humidity increase. For less conductive films the conductivity increased with humidity. These behaviours were sensitive to frequencies used for the measurements

A comparison of electric behaviours of thin films prepared from particles covered with polypyrrole and poly(3,4-ethylenedioxythiophene) coated particles is presented.

This work was supported by Ministry of Education, Youth and Sports of the Czech Republic under grant No. 1041/2006-32 (COST).