G. Casalboremiceli et al., RELATION BETWEEN AMBIENT HUMIDITY AND IONIC-CONDUCTIVITY OF POLY(THIONAPHTHENEINDOLE) - BEHAVIOR AS AN AMPEROMETRIC HUMIDITY SENSOR, Journal of Applied Electrochemistry, 27(4), 1997, pp. 441-447
The electrical characteristics of oxidized poly(thionaphtheneindole) w
ere investigated as a function of ambient relative humidity (r.h.). Th
e current flowing through a pressed pellet of material between two mas
sive gold electrodes plotted against voltage gives a wave-shaped curve
with a halfwave potential at V = similar to 3 V. The current recorded
at 4 V (plateau of the wave) is a sigmoidal function of r.h, with the
inflexion point at similar to 60%. An interpretation of these finding
s is given, based on the influence of water on the dielectric constant
of the material and on acid-base equilibrium between poly(thionaphthe
neindole) and water, from which protons are produced. The behaviour of
poly (thionaphtheneindole) as the active component of an amperometric
humidity sensor is also reported.