Bimetallic AuPt sensitized In2O3 nanofibers for highly selective triethylamine detection at low temperature

Developing high-performance Triethylamine (TEA) sensing technology is of great significance for industrial production safety, environmental protection and occupational health. In this work, a simple, low-temperature and highly selective TEA sensor based on bimetallic AuPt-sensitized In 2 O 3 nanofibers (AuPt-In 2 O 3 ) was designed. Pristine In 2 O 3 nanofibers were prepared by electrospinning, and AuPt-In 2 O 3 nanofibers were further synthesized via combination of one-step thermal injection and ultrasound self-assembly. The results show that the optimized AuPt-In 2 O 3 modified sensor exhibits high sensitivity to TEA at 200 °C, with a faster response time (6 s) and higher response value (Ra/Rg = 5.56) towards 1 ppm TEA than pure In 2 O 3 sensor, which is attributed to the combined effects of spillover, synergistic catalysis and novel heterojunction formation. Endowed with a wide detection range (0.5 ppm - 200 ppm), good short-term repeatability, 35-day long-time stability and anti-interference ability in complex gas environments, the sensor is highly practical for seafood freshness detection and industrial TEA leakage identification, which can effectively support TEA monitoring to mitigate related risks.