Abstract
The effect of nitrogen dioxide and chlorine on the conductivity of thin films of lead oxide and heat-treated lead phthalocyanine (PbPc) has been examined, with a view to assessing the significance of Pb x O y species in the fast response observed in the thermally treated PbPc films. Powder diffraction studies suggest that the lead oxide films are probably PbO, and the gas-effect studies reveal that the responses of the two materials to electron-acceptor gases are in opposite directions. We conclude that the formation of lead oxide on the surface of thermally treated PbPc is unlikely to account for the improved sensor properties observed.
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