The Au-modified Nd-doped In₂O₃hollow microspheres were prepared by hydrothermal method as well as UV irradiation reduction. Their microstructure and phase structure were characterized by SEM, TEM and XRD. The effect of Nd³⁺doping and Au loading were discussed based on the results of XPS, UV-vis, BET. The gas-sensitive measurement reveal the In₂O₃loaded with 2 wt% Au and doped with 3 mol% Nd³⁺(2 wt%Au/3 mol% Nd-In₂O₃) exhibited the optimal sensing performance among Au-modified Nd-doped In₂O₃nanocomposites. Compared with unmodified In₂O₃, its sensing properties are improved. The response to 100 ppm triethylamine is 61, 4 times of pure In₂O₃, along with improved selectivity, declined optimum operation temperature, reduced recovery time and good stability. Using Nd-In₂O₃and Au/In₂O₃as control samples, the synergetic roles of Nd doping and Au loading in sensing process were discussed. By the cooperation of Nd and Au, more oxygen vacancies, raised electric resistance and increased specific surface area are triggered, which improve the gassensitive performance of the sensor. The excellent sensing performance of Au-modified Nd-doped In₂O₃nanocomposites makes it a potential sensing material for triethylamine detection.

原文链接：https://doi.org/10.1016/j.vacuum.2023.112240