Low power consumption micro C2H5OH gas sensor based on micro-heater and ink jetting technique

Micro alcohol gas sensor was fabricated based on micro-heater by using CMOS compatible MEMS process and ink jetting technique. The paste for ink jetting deposition was based on semiconducting In2O3 powder. In the structure of micro-heater, two semi-circled Pt heaters, where some etching holes including etching hole in the center of the micor-heater exist, are connected to the spreader for thermal uniformity and reduction of the Si etching time. Based on the above design, low power consumption alcohol gas sensor was fabricated, which showed substantial sensitivity down to 0.05 ppm alcohol at low power consumption (24 mW).