ZIF-8 derived ZnO@CeO2 heterojunction for ppb-level acetone detection

The development of high sensitivity acetone gas sensor is of great significance for air quality monitoring and diagnosis of diseases. Herein, ZIF-8 derived [email protected]2 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). [email protected]2-1 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 [email protected]2 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 [email protected]2 heterostructure and the surface Ov can effectively improve the sensing performance. Our study provides an ingenious strategy to produce [email protected]2 nanostructures as well as new insights for the detection of acetone.