Acetone Gas-sensing Properties of Multiple-networked Pd-decorated Bi2O3 Nanorod Sensors

摘要

This study examined the sensing properties of Bi2O3 nanorods decorated with Pd nanoparticles. Pd-decorated beta-Bi2O3 nanorods were prepared by immersing the Bi2O3 nanorods in ethanol/(50 mM)PdCl2 solution followed by UV irradiation and annealing. The Bi2O3 nanorods decorated with Pd nanoparticles showed faster and stronger response to acetone gas than the pristine Bi2O3 nanorods. Interestingly, the difference in response time between the Pd-decorated Bi2O3 nanorod sensor and pristine Bi2O3 nanorod sensor increased with increasing the acetone gas concentration. In contrast, the difference in recovery time between the two nanorod sensors decreased with increasing the acetone gas concentration. This difference can be explained using the chemical mechanism. The underlying mechanism for the enhanced response of the Bi2O3 nanorods decorated with Pd nanoparticles to acetone gas is also discussed.