期刊
CARBON
卷 72, 期 -, 页码 264-273出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.01.074
关键词
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资金
- National Science Foundation [CMMI-0727250, SNM-1120382, ERC- 0812348]
- DURIP-ONR Grant
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1120382] Funding Source: National Science Foundation
- Div Of Engineering Education and Centers
- Directorate For Engineering [1343568] Funding Source: National Science Foundation
Record-long (21.7 mm) vertically aligned MWNT arrays were synthesized using water-assisted thermal CVD process. The catalyst lifetime was maintained for 790 min at optimized experimental condition. The growth of the centimeter long CNT was observed by real time photography at different growth conditions. The growth length increased linearly with increasing growth time followed by a sudden growth end. The ratio of ethylene and H-2 concentration as well as the water and ethylene concentration was studied and optimized which led to prolong catalyst lifetime. Transmission electron microscope images confirmed that most CNTs were double wall and the number of wall distribution was uniform along different height position. Raman spectra showed that the I-D/I-G ratio remained constant at the 3 studied positions along the CNT. TGA demonstrated negligible impurity incorporation in the CNT array. (C) 2014 Elsevier Ltd. All rights reserved.
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