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A layer-by-layer deposition mechanism for producing a pyrolytic carbon coating on carbon nanotubes

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Title: A layer-by-layer deposition mechanism for producing a pyrolytic carbon coating on carbon nanotubes
Authors: Zheng, Guo-Bin / Sano, Hideaki / Uchiyama, Yasuo
Issue Date: Jun-2013
Publisher: Elsevier Limited
Citation: Carbon, 57, pp.267-273; 2013
Abstract: Pyrolytic carbon (PyC) was deposited on carbon nanotubes (CNTs) in order to modify them by introducing defects to their surface. The deposition of PyC was carried out at temperature between 800 and 1000 °C using propane as carbon source with or without a hydrogen carrier gas at low pressure of 20 kPa. The structure of PyC coatings was examined using transmission electron microscopy. The PyC coating could be distinguished from the original CNT walls due to the difference of the structure, with the coating showing a less orderly layer structure. When H2 was introduced during deposition, PyC coating started to form at 900 °C, and the deposition rate increased rapidly with increasing temperature. Without H2, PyC coating with a thickness of a few layers could be formed at temperatures between 800 and 900 °C in 10 min. The outmost layer of the PyC coating showed a structure of rough and curved carbon fragment. A layer-by-layer mechanism is proposed for the deposition consisting of alternating fragment formation (nucleation) and lateral growth to layer.
URI: http://hdl.handle.net/10069/33455
ISSN: 00086223
DOI: 10.1016/j.carbon.2013.01.073
Rights: © 2013 Elsevier Ltd. All rights reserved. / NOTICE: this is the author’s version of a work that was accepted for publication in Carbon. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Carbon, 57(2013)
Type: Journal Article
Text Version: author
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/33455

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