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Effect of morphology on the strain recovery of vertically aligned carbon nanotube arrays: An in situ study

Pathak, Siddhartha and Raney, Jordan R. and Daraio, Chiara (2013) Effect of morphology on the strain recovery of vertically aligned carbon nanotube arrays: An in situ study. Carbon, 63 . pp. 303-316. ISSN 0008-6223. doi:10.1016/j.carbon.2013.06.083.

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We report on the distinctly different mechanical responses of two vertically aligned carbon nanotube (VACNT) films, subjected to large displacement (up to 70 μm) flat punch indentations. The VACNT films were synthesized using the same chemical vapor deposition (CVD) technique but for varying reaction times, which resulted in their different thicknesses (480 and 160 μm, respectively) and morphologies. In situ tests reveal that the shorter, more aligned VACNT film deforms via an instantaneous vertical shearing of the material directly underneath the indenter tip, which is manifested as a rapid displacement burst in the load–displacement response when tested at rates of 100 nm/s and above. The resultant buckles were of a more permanent nature leading to their low recoverability (22–40%). In contrast, we find the thicker, more tortuous VACNT film to show a higher (∼80%) recovery and a more compliant response. These differences in the mechanical response of the VACNTs are discussed in the framework of foam-like deformation with a particular emphasis on their different morphological features, namely density and tortuosity.

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Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2013 Published by Elsevier Ltd. Received 7 March 2013. Accepted 22 June 2013. Available online 2 July 2013. We acknowledge Prof. Julia R. Greer for helpful discussions and for providing access to testing facilities. SP gratefully acknowledges support from the W.M. Keck Institute for Space Studies Postdoctoral Fellowship program for this work. JRR acknowledges the Army Research Office and the Department of Defense for funding via a National Defense Science & Engineering Graduate fellowship during the course of this work. CD acknowledges support from the Institute for Collaborative Biotechnologies under contract W911NF-09-D-0001 with the Army Research Office. We acknowledge critical support and infrastructure provided for this work by the Kavli Nanoscience Institute at Caltech.
Group:Kavli Nanoscience Institute, Keck Institute for Space Studies
Funding AgencyGrant Number
Keck Institute for Space Studies (KISS)UNSPECIFIED
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
Army Research Office (ARO)W911NF-09-D-0001
Kavli Nanoscience InstituteUNSPECIFIED
Record Number:CaltechAUTHORS:20131101-105544944
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Official Citation:Siddhartha Pathak, Jordan R. Raney, Chiara Daraio, Effect of morphology on the strain recovery of vertically aligned carbon nanotube arrays: An in situ study, Carbon, Volume 63, November 2013, Pages 303-316, ISSN 0008-6223, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42189
Deposited By: Ruth Sustaita
Deposited On:01 Nov 2013 18:38
Last Modified:10 Nov 2021 16:19

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