Abstract
The development of high sensitivity acetone gas sensor is of great significance for air quality monitoring and diagnosis of diseases. Herein, ZIF-8 derived ZnO@CeO2 heterojunction was prepared by simple hydrothermal method to achieve ppb level detection of acetone. ZnO was decorated on the surface of CeO2 matrix by using ZIF-8 as sacrificial template, which was beneficial to enlarge the specific surface area and generate abundant oxygen vacancies (OV). ZnO@CeO2-1 min composites show excellent sensing performance towards acetone detection, with low detection limit (240 ppb), high response (32 for 100 ppm acetone) and good stability. Particularly, the electronic modulation of ZnO@CeO2 heterojunction increases the resistance variation during the sensing process, and OV increases the carrier concentration of sensitive materials, providing more active sites. The synergistic effect of the construction of ZnO@CeO2 heterostructure and the surface Ov can effectively improve the sensing performance. Our study provides an ingenious strategy to produce ZnO@CeO2 nanostructures as well as new insights for the detection of acetone.
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