| 摘要:采用水热法制备MgSn(OH)6前驱体，经过高温煅烧得到了Mg2SnO4/SnO2复合氧化物立方纳米颗粒。采用XRD、SEM、EDS对煅烧前后样品的物相、形貌、组分进行了表征。在不同温度下测试了Mg2SnO4/SnO2复合氧化物气敏元件对甲醇气体的敏感性能。结果表明，该复合氧化物对甲醇气体具有良好的灵敏度和选择性。在最佳工作温度为300℃时对50~5000 ppm浓度范围内的甲醇气体具有良好的线性关系，2000 ppm时气敏元件的响应、恢复时间分别为12s和8s。 |
| 关键词: 锡酸镁 二氧化锡 复合氧化物 气敏性能 立方纳米颗粒 |
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| Synthesis and gas sensing properties of cubic Mg2SnO4/SnO2 complex oxides |
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| Abstract:Precursor MgSn(OH)6 were synthesized by the hydrothermal method. And Mg2SnO4/SnO2 complex oxide nanocubes were obtained by subsequent thermal treatment. The phase structures, surface morphologies and component of the samples were characterized by X-ray diffraction, scanning electron microscope and energy disperse spectroscopy. The gas sensitivity and selectivity of the complex oxide for methanol has been studied at different working temperature. The results show that the Mg2SnO4/SnO2 exhibited good sensitivity and selectivity. It exhibits a linear relationship in the range of 50~5000 ppm at the optimum temperature of 300℃. The response and recovery time of the gas sensor were 12s and 8s, respectively, for 2000 ppm methanol. |
| Key words: Mg2SnO4 SnO2 complex oxides gas sensing properties cubic nanoparticles |