Design and application of highly responsive and selective rGO-SnO2 nanocomposites for NO2 monitoring
| Autor: | Xiaoguang San, Yanbai Shen, Guodong Li, Ping Fang, Fulai Hao, Dezhou Wei, Dan Meng, Pengfei Zhou |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Nanocomposite Graphene Mechanical Engineering Oxide 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Hydrothermal circulation law.invention chemistry.chemical_compound Tetragonal crystal system chemistry Chemical engineering X-ray photoelectron spectroscopy Mechanics of Materials law 0103 physical sciences General Materials Science Fourier transform infrared spectroscopy 0210 nano-technology Selectivity |
| Zdroj: | Materials Characterization. 163:110284 |
| ISSN: | 1044-5803 |
| Popis: | In this work, the reduced graphene oxide (rGO) was introduced into SnO2 nanospheres to form the rGO-SnO2 nanocomposites, which were used for designing a high-performance NO2 gas sensor. The rGO-SnO2 nanocomposites were synthesized by a simple hydrothermal method, with the GO consumption from 0.1 wt% to 0.6 wt%. The synthesized samples were characterized by XRD, SEM, AFM, TEM, FTIR, and XPS. Microstructural characterization indicates that both pure SnO2 and SnO2 nanospheres in rGO-SnO2 nanocomposites have a tetragonal cassiterite structure. Pure SnO2 is a series of microspheres with the diameter of 1–2 μm assembled by a lot of nanoplates. While the SnO2 nanospheres with the diameter of 40–60 nm uniformly distribute on the rGO sheets. The pure rGO based sensor, pure SnO2 based sensor and rGO-SnO2 nanocomposite based sensor were investigated in their gas sensing performance at the operating temperature of 75–175 °C. The 0.2 wt% rGO-SnO2 nanocomposites show a higher response of 53.57 and faster response/recovery time of 16 s/63 s to 3 ppm NO2 at 125 °C than pure rGO and pure SnO2. The test results indicate that the introduction of rGO into SnO2 improves its sensing performance. Moreover, the rGO-SnO2 nanocomposites exhibit a high selectivity and good reproducibility to NO2. |
| Databáze: | OpenAIRE |
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