A Room Temperature VOCs Gas Sensor Based on a Layer by Layer Multi-Walled Carbon Nanotubes/Poly-ethylene Glycol Composite

作者：Liu, Zitao; Yang, Tuoyu; Dong, Ying^*; Wang, Xiaohao

来源：Sensors (Switzerland), 2018, 18(9): 3113.

DOI：10.3390/s18093113

• VOC
• gas sensor
• PEG
• MWCNTs
• room temperature

Sensitive detection of volatile organic compounds (VOCs) is significant for environmental monitoring and medical applications. In this work, multi-walled carbon nanotubes (MWCNTs) and polyethylene glycol (PEG) that have good adsorption for VOCs, were sprayed layer by layer on an interdigitated electrode (IDE) to build a sensitive VOCs gas sensor. The relative resistance change (oR/R) when the sensor was exposed to VOCs was measured. The sensor showed high sensitivity to acetone, ethanol, isopropanol and isoprene with fast response (110 +/- 5 s) and recovery (152 +/- 5 s) at room temperature, and the lower detection limit (LDL) of the sensor reached 9 ppm. With the micro-fabricated IDE structure, the sensor can be easily built into an electric nose for VOC recognition and measurement.

• 出版日期2018-9
• 单位清华大学