Journal
NANO LETTERS
Volume 16, Issue 1, Pages 232-236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03607
Keywords
Carbon nanotube junctions; in situ nanoindentation; atomistic modeling
Categories
Funding
- U.S. Department of Defense: Air Force Office of Scientific Research (AFOSR) [FA9550-12-1-0035]
- NSF [OCI-1053575, TG-DMR100029, OCI-0959097]
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Here we report a unique method to locally determine the mechanical response of individual covalent junctions between carbon nanotubes (CNTs), in various configurations such as X, Y, and A-like. The setup is based on in situ indentation using a picoindenter integrated within a scanning electron microscope. This allows for precise mapping between junction geometry and mechanical behavior and uncovers geometry-regulated junction stiffening. Molecular dynamics simulations reveal that the dominant contribution to the nanoindentation response is due to the CNT walls stretching at the junction. Targeted synthesis of desired junction geometries can therefore provide a structural alphabet for construction of macroscopic CNT networks with tunable mechanical response.
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