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Preparation of Well-aligned CNT Arrays Catalyzed with Porous Anodic Aluminum Oxide Template
Xing Chen,Xing-jiu Huang,Jia-rui Huang,Zhong-ying Huang,Wei-hong Xu,Jin-huai Liu*
Author NameAffiliation
Xing Chen Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China 
Xing-jiu Huang Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China 
Jia-rui Huang Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China 
Zhong-ying Huang Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China 
Wei-hong Xu Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China 
Jin-huai Liu* Hefei Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China 
Abstract:
Well-aligned open-ended multi-walled carbon nanotube (MWCNT) arrays were prepared via chemical vapor deposition (CVD) method in porous anodic aluminum oxide (AAO) templates without depositing any transition metals as catalyst. Effects of the CVD temperature and heat treatment were studied in detail.Well-aligned open-ended MWCNT arrays were obtained at the CVD temperature above 600 ℃; when CVD temperature is reduced to around 550 ℃, CNTs, CNFs and other structures existed at the same time; no CNTs or carbon nanofibres (CNFs) could be found as the CVD temperature is below 500 ℃, and only amorphous carbon in the porous AAO template was found. Experimental results showed that the AAO template is catalytic during the CVD process, and it has the following two effects: to catalyze thermal decomposition of acetylene and to catalyze conversion of carbon decomposed from acetylene into CNTs or CNFs. Heat treatment could improve the graphitization degree, but it might also introduce new defects.
Key words:  Well-aligned CNT arrays, AAO template, CVD, Catalysis of alumina
FundProject:
多孔氧化铝模板催化制备定向碳纳米管阵列
陈星,黄行九,黄家锐,黄仲婴,徐伟宏,刘锦淮*
摘要:
在不加过渡金属做催化剂的前提下,利用化学气相沉积法在二次阳极氧化法制得的多孔氧化铝模板中制备沉积了定取向碳纳米管阵列.考察了不同沉积温度以及退火处理对沉积结果的影响.温度达到600℃以上时,能得到开口的、定取向的多壁碳纳米管阵列;当沉积温度降至550℃左右时,沉积结果中存在碳纳米管、纳米纤维以及类似于弯曲的竹节状的结构;温度继续降低至500'℃以下时,不能得到碳纳米管或碳纳米纤维;从实验结果中可以得出,在氧化铝模板中沉积碳纳米管过程中氧化铝起到了催化乙炔裂解以及催化沉积的碳石墨化成碳纳米管两种作用.另外,退火处理虽然能够提高沉积的碳纳米管的石墨化程度,但是也可能会引入新的缺陷.
关键词:  定取向碳纳米管  多孔氧化铝模板  化学气相沉积法  催化作用
DOI:10.1360/cjcp2006.19(1).79.5
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