Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 330, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.129280
Keywords
Graphene; ZnFe2O4; Solvothermal method; Ethanol; Gas sensor
Funding
- National Natural Science Foundation of China [61603001, 21976002, 21675158, 61971003]
- Anhui Provincial Natural Science Foundation for Distinguished Young Scholars [2008085J11]
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The study successfully constructed ZnFe2O4 nanosheets assembled on reduced graphene oxide, demonstrating excellent gas sensing properties with strong response to ethanol. The integration of graphene oxide was found to increase selectivity, and the composite showed good stability and satisfied response to ethanol ranging from 0.1 ppm to 100 ppm at 210 degrees C.
The design and synthesis of materials with unique hierarchical structure has important scientific and practical significance in improving their sensing properties. Herein, ZnFe2O4 nanoparticles assembled nanosheets (ZnFe(2)O(4)NSs) grown on reduced graphene oxide (RGO) was creatively constructed via a simple and fast microwave-assisted solvothermal method. RGO played the role as ground for the growth of ZnFe(2)O(4)NSs, and the growing process was investigated by a series of irradiation time dependent experiments. Finally, the gas sensing properties for the as-prepared ZnFe(2)O(4)NSs/RGO composites were evaluated. The integration of RGO was found to increase the selectivity of ZnFe2O4 to ethanol. It was found that the ZnFe(2)O(4)NSs/RGO composite with an irradiation time of 4 h (ZnFe(2)O(4)NSs/RGO 4 h) based sensor showed better ethanol sensing performance than that of sensors based on ZnFe(2)O(4)NSs assembled sphere without RGO, ZnFe2O4 nanoparticles and ZnFe(2)O(4)NSs/RGO composites with other irradiation time, respectively. ZnFe(2)O(4)NSs/RGO(4) h based sensors showed good stability and satisfied response to ethanol ranging from 0.1 ppm to 100 ppm at 210 degrees C. The high response was attributed to its unique architecture, the integration of RGO and the formation of heterojunction between RGO and ZnFe2O4.
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