Bimetallic PtPd functionalized In2O3 nanoparticles for TEA sensing: A combined experimental and theoretical study.

Bimetallic PtPd nanostructures were synthesized via a facile one-step coreduction method at room temperature and loaded on the In 2 O 3 nanoparticles (NPs) through self-assemblies. Among the PtPd-functionalized In 2 O 3 NPs with different PtPd alloy compositions, the sample with the Pt/Pd molar ratio of 3.0 exhibits the highest response value of 232.7 in the detection of 100 ppm triethylamine at 130 °C and a detection threshold as low as 5 ppm. Besides, the optimal working temperature was reduced by 30 °C and the selectivity coefficient under the interference of ammonia and some common VOCs elevated from 2.54 to 4.85 compared with the pristine counterpart. Eventually, the sensitization mechanism referring to the pristine In 2 O 3 and monometal-functionalized In 2 O 3 is explained by oxygen vacancy, the metal/metal oxide-semiconductor junctions and the synergistic catalytic effect of the PtPd nanostructure with the help of density functional theory simulations. [ABSTRACT FROM AUTHOR]