All printed organic humidity sensor based on egg albumin
Muhammad Umair Khan, Qazi Muhammad Saqib, Gul Hassan, Jinho Bae
Abstract
In this paper, bio-compatible layer based on egg albumin (EA) is used for humidity sensing. The EA composed of different types of globular proteins. The chemical composition of these hydrophilic proteins makes the EA membrane sensitive towards humidity. The relative humidity (RH) variation of EA humidity sensor was recorded in the range between 0% and 100% RH. The impedance response of EA humidity sensor varied from 3.965 MΩ to 65.84 kΩ at 1 kHz and from 407.81 kΩ to 3.99 kΩ at 10 kHz. The capacitance response varied from 4.5 nF to 1.36 μF at 1 kHz and from 9.05 nF to 705.71 nF at 10 kHz respectively. The EA humidity sensor shows a high capacitance sensitivity ~ 30,122.22% at 1 kHz, and ~ 7697.9%. at 10 kHz. The sensor presents fast transient response and for real time application inhale and exhale test was performed, which shows high sensitivity in a range from 35% to 100% RH. The proposed EA humidity sensor will open new possibilities towards biocompatible electronic devices.