水对800℃下CH_4在Ar气中分解制备单壁碳纳米管的影响

The effects of H_2O on the synthesis of SWCNTs by decomposing CH_4 in Ar at 800℃

利用透射电子显微镜和拉曼光谱方法研究了水对 80 0℃下Ar气中催化分解CH4 制备单壁碳纳米管 (SWCNTs)的影响 .结果表明 ,反应气中少量水 (室温下反应气的湿度约 5 % )的引入提高了产物中SWCNTs的含量 .初步分析认为 ,水在反应过程中起到了提纯作用 ,从而降低无定形碳生成率 .此外 ,还发现水的引入缩小了产物中SWCNTs的管径分布 .

The effects of H 2O on the synthesis single-wall carbon nano-tubes(SWCNTs)by decomposing CH 4 in Ar at 800℃ were studied by TEM and Raman scattering. It i s shown that the water existing in the reacting gas increases the percentage com position of the SWCNTs in the products. Preliminary analyses indicate that the w ater is involved in the purification course, and the generation of the amorphous carbon is brought about. Furthermore, the water can affect the distribution of the SWCNTs'diameter.