Molecular imprinting Ag-LaFeO3 spheres for highly sensitive acetone gas detection
| Autor: | Yumin Zhang, Qian Rong, Qingju Liu, Jicu Hu, Jin Zhang, Baoye Zi, Zhongqi Zhu, Chao Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Annealing (metallurgy) Mechanical Engineering Nanoparticle Infrared spectroscopy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material 0104 chemical sciences X-ray photoelectron spectroscopy Chemical engineering Mechanics of Materials Transmission electron microscopy General Materials Science 0210 nano-technology Molecular imprinting |
| Zdroj: | Materials Research Bulletin. 109:265-272 |
| ISSN: | 0025-5408 |
| Popis: | In this paper, Sliver doped LaFeO3 nanocrystalline sphere were prepared by sol-gel and molecular imprinting technique (MIT). The carbon microsphere was used as template to regulate the morphology of Ag-LaFeO3, and will be burning off after annealing. The synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and Fourier transform infrared spectrometer (FT-IR) and X-ray photoelectron spectroscopy (XPS). The gas-sensing performance of Ag-LaFeO3 molecular imprinting spheres (MIT Ag-LaFeO3 spheres) was compared with that of Ag-LaFeO3 nanoparticles. The gas sensors fabricated with the MIT Ag-LaFeO3 spheres samples possess high sensitivity and good selectivity than that of Ag-LaFeO3 nanoparticles. At the optimal operating temperature of 155 °C, the response of the MIT Ag-LaFeO3 spheres sensor to 5 ppm acetone is 23.3, which is 16 higher than that of Ag-LaFeO3 sensor, and the response and recovery times are 55 s and 60 s, respectively. It was found that the MIT Ag-LaFeO3 spheres exhibited excellent acetone gas-sensing properties. |
| Databáze: | OpenAIRE |
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