改变催化剂性质是提高碳纳米管质量的一个重要的途径。在火焰法制备碳纳米管实验中,主要对比了溶胶-凝胶法和浸渍法2种催化剂制备方法。通过扫描电子显微镜、拉曼光谱仪和透射电子显微镜3种手段对合成的碳纳米管进行系统性表征。结果表明:浸渍法制备的催化剂粘性更大,更易于粘在探针或基板上,有利于碳纳米管的大型化生产;与溶胶-凝胶法相比,用浸渍法催化剂合成的碳纳米管拉曼光谱中D峰与G峰的比值下降了12.5%,碳纳米管直径缩小了18.1%且碳管更平直,石墨化程度更高。在催化剂制备工艺相近的条件下,选择浸渍法可以改善碳纳米管的质量。
In order to improve the quality of carbon nanotubes,it is an important way to change the nature of the catalyst,in the experiment of carbon nanotubes prepared by flame method,two methods for preparation of catalysts,sol-gel method and impregnation method,were compared.The resulting carbon nanotubes were systematically characterized in three ways:SEM,Raman and TEM.The results showed that the catalyst prepared by impregnation was more viscous and easier to dip onto the probe or substrate.It was beneficial to large-scale production of carbon tubes,in the Raman spectra of synthesized carbon tubes,the ratio of ID/IG was 12.5% lower than that of sol-gel method.TEM statistics showed that the diameter of carbon tubes decreased by 18.1%,and the carbon tubes were more flat and more graphitized.Therefore,the impregnation method can improve the quality of carbon nanotubes under almost the same catalyst preparation process.
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基金资助
国家科技支撑计划项目(2015BAA04B02)
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