J. Wang, M. Sowa and H.H. Mantsch are at the Institute for Biodiagnos tics, National Research Council Canada, 435 El/ice Avenue, Winnipeg, Manitoba, Canada R3B 7Y6. A. Bittner and H.M. Heise are at the lnstitut fiir Spektrochemie und Angewandte Spektroskopie, Bunsen-Kirchhoff-Str. 11, D-44 139 Dortmund, Germany.
New materials for electrochemical sensing I. Rigid conducting composites