CHU Xiangfeng (1966-), male, Ph.D., Professor. E-mail: xfchu99@ahut.edu.cn
The development of a high-property ammonia gas sensor is of great significance for human health and environmental protection. Herein, MgFe2O4 nanomaterial was synthesized by a sol-gel method, and then a series of Ti3C2Tx-MgFe2O4 composites were prepared by an ethanol ultrasonic dispersion method. The structure and morphology of Ti3C2Tx-MgFe2O4 composites were characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The gas sensing performance of the sensors based on different ratios of Ti3C2Tx-MgFe2O4 composites was investigated. The result shows that the gas response of 2.5% (in mass) Ti3C2Tx-MgFe2O4 composite (Ra/Rg=4.7) to 100 μL/L ammonia at 25 ℃ is 3.6 times greater than that of pristine MgFe2O4 nanomaterial (Ra/Rg=1.3). Meanwhile, this composite exhibits superior selectivity and fast response/recovery durations (i.e., 10.8 s/6.6 s).
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |