Ambient Chemiresistive Sensing of Hydrogen Peroxide Based on PEDOT:PSS/PEDOT Film

Compared with other gas-phase analytes, the coexistence and competing effect of the moisture component has long created great difficulty and technical challenges for the reliable detection of chemically oxidizing active H2O2 vapor (HPV). Recently, our group designed and prepared a chemiresistive sensor based on conductive films of poly(3,4-ethylenedioxythiophene) (PEDOT), poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), and PEDOT:PSS/PEDOT to achieve direct detection of HPV at the ppm level. Specially, the hydrophobic PEDOT layer was polymerized on the surface of the PEDOT:PSS film using the electrochemical method to attenuate the adverse effect of moisture within HPV on the stability and detection performance of the PEDOT:PSS/PEDOT sensing film.