Micro Ethanol Sensors with a Heater Fabricated Using the Commercial 0.18 μm CMOS Process

Sensors

Wei-Zhen Liao²  Ching-Liang Dai¹ 

[1]Department of Mechanical Engineering, National Chung Hsing University, Taichung 402, Taiwan

关键词: ethanol sensor;    zinc oxide film;    heater;    post-process;   

DOI  :  10.3390/s131012760

来源: mdpi

【 摘 要 】

The study investigates the fabrication and characterization of an ethanol microsensor equipped with a heater. The ethanol sensor is manufactured using the commercial 0.18 μm complementary metal oxide semiconductor (CMOS) process. The sensor consists of a sensitive film, a heater and interdigitated electrodes. The sensitive film is zinc oxide prepared by the sol-gel method, and it is coated on the interdigitated electrodes. The heater is located under the interdigitated electrodes, and it is used to supply a working temperature to the sensitive film. The sensor needs a post-processing step to remove the sacrificial oxide layer, and to coat zinc oxide on the interdigitated electrodes. When the sensitive film senses ethanol gas, the resistance of the sensor generates a change. An inverting amplifier circuit is utilized to convert the resistance variation of the sensor into the output voltage. Experiments show that the sensitivity of the ethanol sensor is 0.35 mV/ppm.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.