Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 318, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128222
Keywords
ZnO quantum dots; SnO2 hollow nanospheres; Hybrid hierarchical structures; Gas sensor; Formaldehyde
Funding
- National Natural Science Foundation of China [61904122, 61901293, 61901186]
- Natural Science of Shanxi Province [2016011039, 201801D221188]
- University Science and Technology Innovation Project of Shanxi Province [2019L0281, 2019L0316]
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The ZnO quantum dots modified SnO2 hollow nanospheres (ZnO QDs@SnO2 HNSs) hybrid hierarchical structures were fabricated by modifying ZnO QDs on the surface of SnO2 HNSs using precipitation and hydrothermal method. The gas sensors based on ZnO QDs, SnO2 HNSs and ZnO QDs@SnO2 HNSs present superior sensing properties to formaldehyde compared with three other typical indoor volatile organic compounds (VOCs, including formaldehyde, toluene, benzene and ammonia). In particular, the ZnO QDs@SnO2 HNSs based sensor exhibits high response (36.5-50 ppm), good linearity (1-1000 ppm), rapid response/recovery time (9 s/10 s), ultra-low limit of detection (LOD, 5 ppb) and excellent long-term stability. The ZnO QDs@SnO2 HNSs hybrid hierarchical structures not only ensure the porosity but also create lots of heterojunctions, which is benefit for improving the gas sensing properties of a gas sensor.
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