Highly Selective Room Temperature Trimethylamine Gas Sensor Fabricated Using Conducting Polyaniline, Electrospun Yttrium Doped Tin Oxide, and Nitrogen Doped Graphene Quantum Dot

ABSTRACT The high‐sensitivity trimethylamine (TMA) gas sensor at room temperature is prepared using nitrogen doped graphene quantum dot (N‐GQD) coated electrospun yttrium doped tin oxide (Y:SnO 2 ) fiber and conducting polyaniline (PANI). The XPS spectrum shows that 0.8 wt% Y:SnO 2 contains a higher content of oxygen vacancies, which might provide more reaction sites for further interaction with the electron. The response value of TMA gas in the concentration ranging between 10 and 60 ppm at room temperature for fabricated PANI/N‐GQD/Y:SnO 2 sensors is significantly larger than those of PANI and PANI/Y:SnO 2 sensors. The response difference of PANI/N‐GQD/Y:SnO 2 sensor is about two times larger than pure PANI sensors. This fabricated TMA gas sensor also displays exceptional long‐time stability, repeatability and selectivity. Based on the above results, the prepared PANI/N‐GQD/Y:SnO 2 sensor can be applied to detect the TMA concentration for the freshness of fish.