Humidity dependent electrical properties of an organic material DMBHPET

• Humidity sensing properties of an organic dye material DMBHPET have been investigated.
• Linear behavior for the both resistance/capacitance–humidity measurements has been observed.
• The capacitive sensor has also been simulated by developing a mathematical expression.

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 μm. 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.