The Application of Conductive Poly (3-Hexylthiophene) Thin Film for Hydrazine-Sensitive Chemiresistor

摘要

A Poly (3-Hexylthiophene) (P3HT) thin film-based chemiresistor was investigated for the detection of hydrazine gas. Hydrazine is a highly toxic reducing agent that is used in the guidance and control of missiles and satellites. Hydrazine is a very toxic gas and hence a sensor capable of hydrazine detection at the ppb level is required to protect individuals working around these devices. When the sensor is exposed to hydrazine, a change in resistance occurs in the P3HT thin film. In this research, P3HT thin films were spun onto a silicon substrate with interdigitated gold electrodes to form the micro-sensor. Responses of the micro-sensor to hydrazine at different concentration levels are reported. The effects of heat treatment and different doping level of P3HT thin film were investigated to alter the polymer morphology and improve the performance of the sensor. The results show that heavier doping and annealing improve both the sensitivity and stability of the micro-sensor.