Nitrogen dioxide sensing properties of PEDOT polymer films

- NO2 as a strong oxidant causes overoxidation of the PEDOT polymer.
- Higher operating temperature lowers the influence of humidity.
- The PEDOT based sensor can be used as an accumulating-type NO2 sensor.

This work presents a simple and fully electrochemical route for the polymerization of poly(3,4-ethylenedioxytiophene) (PEDOT) films for fabricating a NO2 gas sensor prepared by electropolymerization of 3,4-Ethylenedioxythiophene (EDOT) monomer in lithium perchlorate/acetonitrile solution. The main aim of this study is to determine the sensing properties of conductive polymer at elevated temperatures. The effects of the humidity, working temperature and sensing response of the PEDOT to environmental gases are investigated. The use of the PEDOT film as NO2 gas meter of total flow of NO2 is evaluated.