Impedimetric humidity sensor based on nanohybrid composite of conducting poly(diphenylamine sulfonic acid)

Interdigitated thin film humidity sensors have been prepared using organic/inorganic nanocomposites of poly(diphenylamine sulfonic acid) (psda),3-mercaptopropyltrimethoxysilane (mptms),and nano-zno. humidity sensing properties of the sensors,regarding the effect of nano-zno addition and the applied alternating current frequency,were studied by impedance measurements in the frequency range of 100 hz-1 khz. it was found that the sensing properties of the zno based nanocomposite sensors had better properties than those of the psda-mptms based composite due to contribution of the nanomaterial. good sensitivity (about three orders' magnitude change in impedance),linear response,rapid response (90 s) and recovery (60 s),and low hysteresis within 4% as well as good repeatability and stability in the range from 12% to 95% rh were obtained. © 2016 şule dinç zor and hüsnü cankurtaran.