AC Complex Impedance Study on the Resistive Humidity Sensors with Ammonium Salt-Containing Polyelectrolyte using a Different Electrode Pattern

Abstract

We examined the effect of electrode fingers and gaps of coplanar interdigitated electrode (IDE) structures to characterize the ammonium salt-containing polyelectrolyte film of resistance-based humidity sensors. IDEs designed for this purpose were flexible gold electrodes deposited on a polyimide substrate using a printing process because the geometry presents a potential for tunable sensitivity over other electrode designs. The basic design of the sensors consisted of IDEs with a different number of electrode fingers such as 3, 4, and 5 and gap sizes of 310, 360, 410, and 460 µm. Details of the AC complex impedance characteristics such as the Nyquist plot, Bode plot, and activation energy based on electrode construction were investigated.

HCl/CSA doped POT-Mn3O4 nanocomposites based conformable thin film temperature sensor for prosthetic hand gloves

“…For all samples the gap size between the silver contacts was 0.2 cm and its length was 1 cm. The contact width is higher than thickness of the thin film therefore it can be ignored [44]. The thickness of the thin film was obtained using weight difference method in high precision analytical balance.…”