Enhanced gas sensing properties for formaldehyde based on ZnO/Zn2SnO4 composites from one-step hydrothermal synthesis
Journal of Alloys and Compounds(2021)
摘要
Formaldehyde gas sensor with high performance is indispensable for monitoring indoor air quality. Exploring novel nanostructured composites as gas sensing materials is considered to be a feasible way to enhance the sensing performance. In this work, one-step hydrothermal method was employed for facile synthesis of ZnO/Zn2SnO4 nanocomposites and the as-prepared sample took on a homogeneous hexagonal lamellar nanostructure with a diameter of 600 nm–900 nm and thickness of about 100 nm. Gas sensing properties of the sample were tested and the results demonstrated that the ZnO/Zn2SnO4 composites possessed excellent sensing performances to formaldehyde. At 160 °C, the ZnO/Zn2SnO4 composites based sensor exhibited a high response of 22.5 towards 100 ppm of formaldehyde and a detection limit as low as 500 ppb. Compared with pristine Zn2SnO4 and ZnO, ZnO/Zn2SnO4 composites showed higher sensitivity (increased by 80% and 120%), better selectivity and lower detection limit. The noteworthy improvement of formaldehyde sensing performances could be attributed to the synergetic effect as well as the formation of n-n type heterojunctions between Zn2SnO4 and ZnO. The mechanism involved in gas sensing performance of ZnO/Zn2SnO4 composites was also discussed.
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关键词
ZnO/Zn2SnO4 composite,Formaldehyde,Gas sensor,One-step hydrothermal,Heterojunction
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