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Effects of morphology on the micro-compression response of carbon nanotube forests

Abadi, Parisa Pour Shahid Saeed and Hutchens, Shelby B. and Greer, Julia R. and Cola, Baratunde A. and Graham, Samuel (2012) Effects of morphology on the micro-compression response of carbon nanotube forests. Nanoscale, 4 (11). pp. 3373-3380. ISSN 2040-3372.

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This study reports the mechanical response of distinct carbon nanotube (CNT) morphologies as revealed by flat punch in situ nanoindentation in a scanning electron microscope. We find that the location of incipient deformation varies significantly by changing the CNT growth parameters. The initial buckles formed close to the growth substrate in 70 and 190 µm tall CNT forests grown with low pressure chemical vapor deposition (LPCVD) and moved to ~100 µm above the growth substrate when the height increased to 280 µm. Change of the recipe from LPCVD to CVD at pressures near atmospheric changed the location of the initial buckling event from the bottom half to the top half of the CNT forest. Plasma pretreatment of the catalyst also resulted in a unique CNT forest morphology in which deformation started by bending and buckling of the CNT tips. We find that the vertical gradients in CNT morphology dictate the location of incipient buckling. These new insights are critical in the design of CNT forests for a variety of applications where mechanical contact is important.

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Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2012 The Royal Society of Chemistry. Received 27 Feb 2012; Accepted 27 Mar 2012; First published on the web 29 Mar 2012. This work was supported by seed funding from the Georgia Institute of Technology. The authors gratefully acknowledge the research assistance of John H. Taphouse and experimental support from Dr Jason Nadler. JRG gratefully acknowledges the financial support of the Army Research Office through the Institute for Collaborative Biotechnologies and Sid Pathak for helpful discussions.
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Army Research Office (ARO)UNSPECIFIED
Issue or Number:11
Record Number:CaltechAUTHORS:20120611-111342071
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31871
Deposited By: Aucoeur Ngo
Deposited On:18 Jun 2012 18:24
Last Modified:03 Oct 2019 03:55

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