Controllable viscoelastic behavior of vertically aligned carbon nanotube arrays

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We have characterized the mechanical behavior of aligned carbon nanotube (CNT) arrays that serve as foam-like energy absorbing materials, by using atomic force microscope indentation. It is shown that the mechanical properties (e.g. elastic modulus, adhesion force, and energy dissipation) of aligned CNT arrays are dependent on the length of CNTs as well as chemical environment that surrounds CNT arrays. More remarkably, it is found that CNT array made of CNTs with their length of 10 mu m exhibits the excellent damping property (i.e. energy dissipation) higher than that of a conventional composite such as Kevlar. It is also shown that the energy dissipation of CNT arrays during loading-unloading process can be reduced by the solution surrounding CNT array, and that the decrease of energy dissipation for CNT array due to solution depends on the solution type, which mediates the interaction between individual nanotubes. Our study sheds light on the design principles for CNT array-based foam-like materials. (C) 2013 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2013-12
Language
English
Article Type
Article
Keywords

INDENTATION; FORESTS; SURFACE; FILMS

Citation

CARBON, v.65, pp.305 - 314

ISSN
0008-6223
DOI
10.1016/j.carbon.2013.08.030
URI
http://hdl.handle.net/10203/187274
Appears in Collection
NT-Journal Papers(저널논문)
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