Zhang, Hao and Cao, Gaoping and Wang, Zhiyong and Yang, Yusheng and Shi, Zujin and Gu, Zhennan (2008) Influence of hydrogen pretreatment condition on the morphology of Fe/Al2O3 catalyst film and growth of millimeter-long carbon nanotube array. JOURNAL OF PHYSICAL CHEMISTRY C, 112 (12). pp. 4524-4530.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp710338d
We systematically studied the influence of pretreatment condition on the morphology of Fe/Al2O3 catalyst film and growth of millimeter-long carbon nanotube array (CNTA). The experimental results confirm that the morphology and activity of the catalyst films are very sensitive to the pretreatment condition. A uniformly dispersed and densely packed catalyst monolayer with high activity, which can be used to synthesize a 1.2-mm-long CNTA, is prepared by annealing the Fe (1.2 nm)/Al2O3 (30 nm) film at 800 degrees C for 8 min in 50 sccm hydrogen. Enhanced pretreatment with H-2 decreases the catalyst activity and suppresses the CNTA growth. The possible mechanism of catalyst annealing and CNTA growth is proposed and discussed for a better understanding of these phenomena.
|Subjects:||Material Science > Functional and hybrid materials|
Physical Science > Nano objects
|Deposited By:||Farnush Anwar|
|Deposited On:||07 Jan 2009 11:50|
|Last Modified:||22 Jan 2009 09:30|
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