Fabrication and characteristics of Pt/ZnO NO sensor integrated SiC micro heater

This paper describes the fabrication and characteristics of a NO sensor using ZnO thin film integrated 3C-SiC micro heater based on 3C-SiC thin film of operation in harsh environments. Sensitivity, response time, and operating properties in high temperature and voltages of NO sensors based SiC MEMS are measured and analyzed. The sensitivity of device with pure ZnO thin film at the heater operating power of 13.5 mW (300°C) was 0.875 in NO gas concentration of 0.046 ppm. In the case of using the Pt added ZnO thin film, the sensitivity at power consumption of 5.9 mW (250°C) was 1.92 at same gas flow rate. Using the Pt added ZnO thin film was showed higher sensitivity, lower working temperature, and faster adsorption characteristics to NO gas than the pure ZnO thin film. The NO gas sensor integrated SiC micro heater is more strength than others in high voltage and temperature.