What is it about?
D.c. conductivity measurements are performed on PPy films initially doped with Fe(CN)64−, then exposed to diluted O2, NH3, NO2 in N2 or air. By working at 100 °C and after a stabilizing treatment, some NH3 sensor ability is found for high concentrations, but this requires the measurement of very low currents. The doping kinetics are analysed as both Elovich superficial adsorption and diffusion in the bulk. A poisoning effect of NO2 is observed, and afterwards the possibility of 'n' doping as by NH3 is demonstrated.
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Why is it important?
NH3 sensor ability is found for high concentrations, but this requires the measurement of very low currents.
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This page is a summary of: Study of the action of gases on a polypyrrole film, Sensors and Actuators B Chemical, January 1990, Elsevier, DOI: 10.1016/0925-4005(90)80187-5.
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