Journal
CARBON
Volume 63, Issue -, Pages 303-316Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2013.06.083
Keywords
-
Funding
- W.M. Keck Institute for Space Studies
- Army Research Office [W911NF-09-D-0001]
- Department of Defense
- Kavli Nanoscience Institute at Caltech
Ask authors/readers for more resources
We report on the distinctly different mechanical responses of two vertically aligned carbon nanotube (VACNT) films, subjected to large displacement (up to 70 mu m) 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 mu m, 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 (similar to 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. Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available