Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 329, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.129152
Keywords
alpha-Fe2O3; Nanotubes; Low crystalline; Hollow microspheres; Gas-sensing performance
Funding
- National Natural Science Foundation of China [51272165, 51672138, 51802306, 51572177]
- Research Foundation of Sichuan University of Science and Engineering [2016RCL05]
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Dandelion-like SiO2@SnO2/alpha-Fe2O3 hollow microspheres were successfully synthesized with mesoporous structure and catalytic effect, showing excellent sensitivity to acetone gas.
Herein, dandelion-like SiO2@SnO2/alpha-Fe2O3 hollow microspheres with average size of 600 nm were successfully synthesized by an in-site hydrothermal method. The alpha-Fe2O3 nanotubes with average diameters of 30 nm were epitaxially grown on the low crystalline mesoporous SiO2@SnO2 hollow spheres. The hollow microspheres owned mesoporous structure, while the pore size and the specific surface area were 8.8 nm and 86.7 m(2)/g, respectively. The influence of the Fe3+ initial concentration on structure, morphology and gas-sensing property of the as-synthesized products were studied. Compared with alpha-Fe2O3, SiO2@SnO2, and other SiO2@SnO2/alpha-Fe2O3 composites, the sensor based on SiO2@SnO2/alpha-Fe2O3-0.15 (the concentration of Fe(3+ )was 0.15 mu M) showed excellent gas sensitivity, which had high response value (41 towards 100 ppm acetone), faster response and recovery time (7 s and 23 s) and a lower detection limit. The remarkable improvement of gas-sensing performance could be attributed to the unique mesoporous SiO2@SnO2/alpha-Fe2O3 hollow structure with alpha-Fe2O3 nanotubes, the large specific surface area, the catalysis of alpha-Fe2O3 and the synergistic effect of SiO2, SnO2 and alpha-Fe2O3. The sensor based on dandelion-like SiO2@SnO2/alpha-Fe2O3 hollow microspheres would be a potential application in acetone gas detection.
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