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

Abstract

This study examined the sensing properties of Bi 2 O 3 nanorods decorated with Pd nanoparticles. Pd‐decorated β‐ Bi 2 O 3 nanorods were prepared by immersing the Bi 2 O 3 nanorods in ethanol/(50 mM ) PdCl 2 solution followed by UV irradiation and annealing. The Bi 2 O 3 nanorods decorated with Pd nanoparticles showed faster and stronger response to acetone gas than the pristine Bi 2 O 3 nanorods. Interestingly, the difference in response time between the Pd‐decorated Bi 2 O 3 nanorod sensor and pristine Bi 2 O 3 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 Bi 2 O 3 nanorods decorated with Pd nanoparticles to acetone gas is also discussed.