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Effect of density variation and non-covalent functionalization on the compressive behavior of carbon nanotube arrays

Misra, A and Raney, JR and Craig, AE and Daraio, C (2011) Effect of density variation and non-covalent functionalization on the compressive behavior of carbon nanotube arrays. In: Nanotechnology, 22 (42).

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Official URL: http://iopscience.iop.org/0957-4484/22/42/425705/

Abstract

Arrays of aligned carbon nanotubes (CNTs) have been proposed for different applications, including electrochemical energy storage and shock-absorbing materials. Understanding their mechanical response, in relation to their structural characteristics, is important for tailoring the synthesis method to the different operational conditions of the material. In this paper, we grow vertically aligned CNT arrays using a thermal chemical vapor deposition system, and we study the effects of precursor flow on the structural and mechanical properties of the CNT arrays. We show that the CNT growth process is inhomogeneous along the direction of the precursor flow, resulting in varying bulk density at different points on the growth substrate. We also study the effects of non-covalent functionalization of the CNTs after growth, using surfactant and nanoparticles, to vary the effective bulk density and structural arrangement of the arrays. We find that the stiffness and peak stress of the materials increase approximately linearly with increasing bulk density.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IOP Publishing ltd.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Date Deposited: 04 Nov 2011 08:38
Last Modified: 04 Nov 2011 08:38
URI: http://eprints.iisc.ernet.in/id/eprint/41629

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