Highly sensitive triethylamine gas sensor by Pt-loaded p-n heterojunction Co 3 O 4 /WO 3 .

Triethylamine (TEA) exists widely in production and life and is extremely volatile, which seriously endangers human health. It is required to develop high-performance TEA sensors to protect human health. We fabricated Pt-Co 3 O 4 /WO 3 based on our previous work, and the performance was tested against volatile organic compounds. Compared with the previous work, its operating temperature was greatly reduced from 240 °C to 180 °C. The response value of Pt-Co 3 O 4 /WO 3 was increased from 1101 to 1532 for 10 ppm TEA with good selectivity. These results show a significant step toward practical use of the Pt-Co 3 O 4 /WO 3 sensor.