The electrical conductivity of thick samples of poly(3-octylthiophene)
has been studied as function of relative humidity at room temperature
. The conductivity increases in dry air and increasing the humidity le
vel of the surrounding atmosphere induces a dedoping reaction resultin
g in decay of the electrical conductivity. Thick samples have been stu
died since interest was focused on possible use in bulk applications o
f the polymer. The effect of doping level was also studied.