Enhanced ethanol gas-sensing performance of Pb-doped In2O3 nanostructures prepared by sonochemical method

Abstract In the present study, the Pb-doped In2O3 nanostructures were prepared by sonochemical method. Different techniques were applied to check the physical properties of the materials obtained. The results clearly indicated cubic structures for all of the products. The ethanol sensing properties of the sensors based on undoped and Pb-doped In2O3 nanostructures with two different Pb concentrations were investigated. Compared with the undoped In2O3 samples, the 1 mM Pb-doped In2O3 nanostructures demonstrated excellent sensing performance toward ethanol at the optimal operating temperature of 250 °C and had a response of approximately 32.57–100 ppm for ethanol. In addition, the Pb-doped In2O3 nanostructures exhibited short response/recovery time, good selectivity, and long-term stability. Finally, the possible reasons for the effect of Pb doping on ethanol-sensing properties were studied, using the XPS, photoluminescence and Raman spectroscopy results.

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