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采用超声波喷雾技术,以SnCl4.5H2O和CO(NH2)2为前驱体原料制备了氧化锡以及Ce稀土离子掺杂纳米粉体。详细地研究了超声喷雾条件、反应时间以及化学组分对纳米SnO2粉体的形貌和尺寸的影响规律,以及前驱体沉淀物脱水化学处理的条件。用XRD,TEM研究了所获纳米粒子的晶相和形貌。结果表明,制备的SnO2纳米粒子呈球状,尺寸在10~20 nm,纳米颗粒均匀,分散性好。以该粉体为基础制备了相应的气敏元件,测定了气体灵敏度与温度和稀土元素掺杂的关系。研究测试表明,纳米SnO2半导体气敏元件对NO2气体有着良好的响应-恢复特性,并且具有较高的灵敏度和较低的工作温度。稀土元素铈的掺杂能明显提高纳米SnO2粉体的气敏性能。
Tin oxide and Ce rare earth ion-doped nano-powders were prepared by ultrasonic spray technique using SnCl4.5H2O and CO (NH2) 2 as precursors. The influences of ultrasonic spray conditions, reaction time and chemical composition on the morphology and size of nano-SnO2 powders were investigated in detail, and the conditions for the chemical treatment of precursor precipitates were studied. The crystal phase and morphology of the obtained nanoparticles were investigated by XRD and TEM. The results show that the prepared SnO2 nanoparticles are spherical, the size of 10 ~ 20 nm, uniform nanoparticles, good dispersion. Based on the powder, corresponding gas sensors were prepared, and the relationship between gas sensitivity and temperature and doping of rare earth elements was also measured. Research shows that the nano-SnO2 semiconductor gas sensor has a good response to NO2 gas - recovery characteristics, and has high sensitivity and lower operating temperature. The doping of rare earth element cerium can obviously improve the gas sensitivity of nano-SnO2 powder.