The Effect of PMMA Pore-Forming on Hydrogen Sensing Properties of Porous SnO2 Thick Film Sensor

SnO2 nanoparticles were synthesized through the sol-gel method, meanwhile, the thick film sensors were prepared with the method of polymethyl-methacrylate PMMA pore-forming and silk screen printing. In this paper, SEM and XRD measurements were employed to represent the structure and morphology of the synthesized SnO2 respectively. With the use of electricity chemical workstation, hydrogen gas sensitive properties were tested. It turns out that the average grain diameter of the SnO2 particle with the structure of tetragonal phase is 60 nm. Along with the increase of the addition of the PMMA concentration, the conductivity of SnO2 reduces significantly, but the response time and recovery time have no obvious change. The effect law of working temperature and sintering temperature on SnO2 response and recovery time was also explored. With the rise of temperature the response time shortens and the recovery time has no obvious change. Moreover, with the increase of the sintering temperature, SnO2 has no clear influence on the response time of H-2. However, the recovery time of H-2 shortens obviously.