Significantly improved triethylamine sensing performance and mechanism of tin oxide by doping Pd: Experimental and DFT studies

Reducing the working temperature and increasing sensitivity selectivity has always been a research hotspot in field of MOS based gas sensors. In this work, improved triethylamine (TEA) sensing performance mechanism SnO2 by doping Pd have investigated. nanoparticles Pd-SnO2 with different amounts (0%, 0.1%, 0.3%, 0.5%, 0.7%) were successfully prepared hydrothermal method. The size is very uniform (∼15 nm). sensor exhibited highest to ethanol at 290 °C. After doping, Pd/SnO2 sensors not only reduced optimum but transformed from TEA. system, 0.5Pd-SnO2 high (61), fast response-recovery properties (16 s/6 s) 50 ppm TEA, lower detection limits (0.1 ppm), good repeatability, higher selectivity. Furthermore, on density functional theory calculations, TEA can be attributed surface activity catalytic activation O2 Pd.