对多壁碳纳米管(MWCNTs)进行氧等离子体改性,并将其超声分散于四氯化锡(SnCl4·5H2O)的盐溶液中,利用静电增强超声雾化热解法制备SnO2-MWCNTs薄膜,研究了薄膜的气敏性能随沉积温度和MWCNTs掺杂量的变化关系.拉曼光谱分析结果表明MWCNTs中sp3杂化C含量增加,反映了MWCNTs表面接枝了含氧官能团.采用场发射扫描电镜、原子力显微镜对薄膜形貌进行表征,结果表明,随着沉积温度和MWCNTs掺杂量的增加,薄膜孔隙率、不匀率都有所增加.X射线衍射结果表明反应过程中SnCl4·5H2O全部转化为了四方晶系金红石结构的SnO2,晶粒尺寸为3 nm左右.气敏性能测试结果表明当沉积温度为300 ℃、MWCNTs掺杂量为10 mg/mL,薄膜的气敏性能较好.
Multi-walled carbon nanotubes (MWCNTs) modified with oxygen plasma.And as-prepared MWCNTs was ultrasonic dispersed in tin tetrachloride solution.SnO2-MWCNTs film was prepared by Electrostatic-enhanced ultrasonic spray pyrolysis.The relationship between the deposition temperature and MWCNTs doping concentration was researched.The results of Raman spectra showed that sp3 hybridization C contents increase in the MWCNTs , reflecting the MWCNTs surface grafted oxygen-containing functional groups.The film morphology were characterized by Field emission scanning electron microscopy and Atomic force microscopy, showing that with deposition temperature and MWCNTs doping concentration increasing, the film porosity and uniform rate increased.X-ray diffraction results showed that all SnCl4·5H2O transform into SnO2, and its crystallite size is about 3nm.Gas sensing performance test results showed the optimal condition is 300 ℃, the amount of doped MWCNTs is 10 mg/mL.
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