Fabrication of a solid H2O2vapor sensor using Cu(II) chelating chitosan as catalyst and PVA/NaNO2as electrolyte

As the flashing hydrogen peroxide (H2O2) vapor was used widely in disinfection and sterilization, the monitoring of gas H(2)O(2)concentration has become a widespread concern. A gas sensor for hydrogen peroxide monitor was prepared based on the Cu(II) chelating chitosan as catalyst and polyvinyl alcohol/sodium nitrite as a solid polymer electrolyte. The characters and structure of the sensor were characterized by SEM, FTIR, and TG. Finally, the electrochemical performance of the sensor and the detection effect of hydrogen peroxide gas content were detected by an electrochemical workstation. When the concentration of chitosan chelate copper is 0.15 wt% and the concentration of solid electrolyte is 0.1 wt%, the response performance of the sensor is the best. The results show that the low detection limit of the prepared sensor is below 1 ppm, the average response time is 2-5 s, and the usage temperature is relatively stable below 80 celcius. Solid-state electrolyte and electrode are combined by solution permeated, which would reduce the response time, implement consecutive period measurement and simplify the correction step. It would be potentially used for real-time monitoring of H(2)O(2)vapor.