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| Synthesis of High Quality Single-Walled Carbon Nanotubes by CVD and Effect of Catalyst’s Acidity-Basicity on Nanotubes Growth |
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Li Yu1, Zhang Xiaobin1, Shen Lihua2, Xu Junming2, Liu Fu2, Xu Guoliang2, Wang Youwen3
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1.Institute of Material Physics and Microstructures, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027;2.Institute of Material Physics and Microstructures, Zhejiang University, Hangzhou 310027;3.Analysis and Measurement Center, Zhejiang University, Hangzhou 310027
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| Abstract: |
| High quality SWNTs are synthesized by catalytic decomposition of CH4/N2 at 1000 ℃ on the Fe-Mo/MgO catalyst prepared by a combustion method. The best combustion temperature is 550 ℃ for the catalyst. The fitting acidity-basicity can explain the high catalytic performance. The as-prepared SWNTs have been characterized by SEM, TEM, HRTEM, TGA and Raman spectroscopy. The results show that the synthesized SWNTs are usually bundles and they have a narrow diameter distribution with 0.85~1.22 nm. The best reaction atmosphere is 50/300 for the catalyst. Under this ratio of CH4/N2, the content of the prepared raw SWNTs is close to 40% weighting over the catalyst. After the raw SWNTs are treated by diluted HCl at room temperature, the sample can contain yield of SWNTs to over 75%. |
| Key words: Combustion method, Acidity-basicity, Single wall carbon nanotubes, Chemical vapor decomposition method |
| FundProject: |
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| 高质量单壁纳米碳管的CVD法合成及催化剂酸碱性对碳管生长的影响 |
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李昱1,2, 张孝彬1,2, 沈利华1, 徐军明1, 刘芙1, 许国良1, 王幼文3
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1.浙江大学材料物理与微结构研究所,杭州,310027;2.浙江大学硅材料国家重点实验室,杭州,310027;3.浙江大学分析测试中心,杭州,310027
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| 摘要: |
| 采用燃烧法制备了Fe/Mo/MgO催化剂，用化学气相沉积法在1000 ℃下催化裂解甲烷制得了单壁纳米碳管．实验结果表明， 550 ℃下焙烧的催化剂效果最好，适宜的酸碱性应该是催化剂具有较高活性的原因．用扫描电镜、 透射电镜、 高分辨透射电镜、 热重分析和拉曼光谱等方法对制备的纳米碳管粗产品进行了表征．结果表明，该产物确为高质量单壁纳米碳管，其形态基本都以束状存在，且单壁纳米碳管直径分布较窄(0.85～1.22 nm)；对反应气氛的考察表明， CH4/N2＝50/300为最佳，该气氛下所制得粗产物中单壁碳 |
| 关键词: 燃烧法 酸碱性 单壁纳米碳管 化学气相沉积法 |
| DOI：10.1088/1674-0068/18/3/411-415 |
| 分类号: |