Catalyst rotation, twisting, and bending during multiwall carbon nanotube growth

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Abstract

Internal crystalline structure of cementite catalyst particles located inside the base of multiwall carbon nanotubes was studied using nanoprobe convergent-beam electron diffraction. The catalyst particles are single crystalline but exhibit combinations of small-angle (∼1°-3°) rotations, twists, and bends along their axial length between adjacent locations. Distortions are most severe away from the base up into the nanotube where the number of walls is large. Near the attachment point to the substrate, however, where few, if any graphene walls exist, particles remain undistorted. This suggests that the stresses generated by the surrounding nanotube distort the catalyst particle during growth.

Original languageEnglish (US)
Pages (from-to)3840-3845
Number of pages6
JournalCarbon
Volume48
Issue number13
DOIs
StatePublished - Nov 2010

Bibliographical note

Funding Information:
The authors thank Dr. O. Ugurlu for technical support. This material is based primarily upon work supported by the National Science Foundation (NSF) grant CBET-0613629. Part of this work was carried out in the College of Science and Engineering Characterization Facility, at the University of Minnesota, which receives partial support from the NSF-NNIN program and capital equipment funding from the National Science Foundation through the MRSEC, ERC and MRI programs.

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