Humidity dependent electrical properties of an organic material DMBHPET

In this paper, we investigate the humidity sensing properties of an organic dye material (E)-2-(4-(2-(3,4-dimethoxybenzeylidene)hydrazinyl)phenyl)ethane-1,1,2-tricarbonitrile (DMBHPET). The sensors were fabricated by making pairs of aluminum electrodes on glass substrates. The gap between the electrodes was 40 lm. The active layer was deposited in the gap using the drop casting technique. The resistive and capacitive outputs of the sensors under the different %RH levels have been recorded which have been further analyzed and simulated by a mathematical expression. The data analysis demonstrates a linear behavior for the both resistance–humidity and capacitance–humidity measurements. Furthermore, hysteresis and response/recovery measurements have also been performed. 2014 Elsevier Ltd. All rights reserved.