Journal
CARBON
Volume 56, Issue -, Pages 38-44Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2012.12.061
Keywords
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Funding
- National Natural Science Foundation of China [21206191]
- Science Foundation of China University of Petroleum, Beijing [QD-2010-03]
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We report a MgO-catalyzed growth of N-doped carbon nanotubes (N-CNTs) that are constructed by graphene layers with wrinkles. Introducing NH3 to a chemical vapor deposition process and keeping a high reaction temperature (similar to 900 degrees C) are key factors to the N-CNT growth from MgO. Without N-doping or at a lower temperature, only graphene sheets deposited on MgO surfaces were obtained. Compared to the Fe-catalyzed N-CNTs, the MgO-catalyzed N-CNTs have larger diameters, thinner walls, more surface wrinkles and open ends with polygonal graphene edges. Because carbon dissolves into MgO in a very limited amount, the structural defects and broken sites formed in the graphene layers due to N-doping might have contributed to the formation of new graphene layers and thus lead to the growth of the wrinkled tubes. (C) 2013 Elsevier Ltd. All rights reserved.
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