960化工网
PdO/SnO2 heterostructure for low-temperature detection of CO with fast response and recovery†
Tingbiao Yuan,Huifang Yuan,Xiaoyan Zheng,Hamza Ijaz,Junfeng Hui,Daidi Fan,Yuxin Zhao,Shi Hu
RSC Advances Pub Date : 07/24/2019 00:00:00 , DOI:10.1039/C9RA03171E
Abstract

In this paper, we developed a simple two-step route to prepare a PdO/SnO2 heterostructure with the diameter of the SnO2 and PdO nanoparticles at about 15 nm and 3 nm, respectively. In the evaluation temperature window between 80 °C and 340 °C, PdO/SnO2 shows the best response to 100 ppm of CO at 100 °C with fast response time (14 s) and recovery time (8 s). Furthermore, the PdO/SnO2 nanoparticles exhibit a low detection limit and good selectivity to CO against interfering gases as well as rarely-seen low-temperature stability and reversibility. Such enhanced gas sensing performance could be attributed to both the ultrafine structure of PdO and the synergy between PdO and SnO2. The results clearly indicate the application of PdO/SnO2 as a pratical low-temperature sensing material for CO.

Graphical abstract: PdO/SnO2 heterostructure for low-temperature detection of CO with fast response and recovery
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