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Hahm MG, Wang H, Jung HY, et al. Bundling dynamics regulates the active mechanics and transport in carbon nanotube networks and their nanocomposites. Nanoscale. 2012;4(11):3584-90doi: 10.1039/c2nr30254c.
Hahm, M. G., Wang, H., Jung, H. Y., Hong, S., Lee, S. G., Kim, S. R., Upmanyu, M., & Jung, Y. J. (2012). Bundling dynamics regulates the active mechanics and transport in carbon nanotube networks and their nanocomposites. Nanoscale, 4(11), 3584-90. https://doi.org/10.1039/c2nr30254c
Hahm, Myung Gwan, et al. "Bundling dynamics regulates the active mechanics and transport in carbon nanotube networks and their nanocomposites." Nanoscale vol. 4,11 (2012): 3584-90. doi: https://doi.org/10.1039/c2nr30254c
Hahm MG, Wang H, Jung HY, Hong S, Lee SG, Kim SR, Upmanyu M, Jung YJ. Bundling dynamics regulates the active mechanics and transport in carbon nanotube networks and their nanocomposites. Nanoscale. 2012 Jun 07;4(11):3584-90. doi: 10.1039/c2nr30254c. Epub 2012 Mar 23. PMID: 22441825.
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Nanoscale. 2012 Jun 07;4(11):3584-90. doi: 10.1039/c2nr30254c. Epub 2012 Mar 23.

Bundling dynamics regulates the active mechanics and transport in carbon nanotube networks and their nanocomposites.

Nanoscale

Myung Gwan Hahm, Hailong Wang, Hyun Young Jung, Sanghyun Hong, Sung-Goo Lee, Sung-Ryong Kim, Moneesh Upmanyu, Yung Joon Jung

Affiliations

  1. Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA.

PMID: 22441825 DOI: 10.1039/c2nr30254c

Abstract

High-density carbon nanotube networks (CNNs) continue to attract interest as active elements in nanoelectronic devices, nanoelectromechanical systems (NEMS) and multifunctional nanocomposites. The interplay between the network nanostructure and its properties is crucial, yet current understanding remains limited to the passive response. Here, we employ a novel superstructure consisting of millimeter-long vertically aligned single walled carbon nanotubes (SWCNTs) sandwiched between polydimethylsiloxane (PDMS) layers to quantify the effect of two classes of mechanical stimuli, film densification and stretching, on the electronic and thermal transport across the network. The network deforms easily with an increase in the electrical and thermal conductivities, suggestive of a floppy yet highly reconfigurable network. Insight from atomistically informed coarse-grained simulations uncover an interplay between the extent of lateral assembly of the bundles, modulated by surface zipping/unzipping, and the elastic energy associated with the bent conformations of the nanotubes/bundles. During densification, the network becomes highly interconnected yet we observe a modest increase in bundling primarily due to the reduced spacing between the SWCNTs. The stretching, on the other hand, is characterized by an initial debundling regime as the strain accommodation occurs via unzipping of the branched interconnects, followed by rapid rebundling as the strain transfers to the increasingly aligned bundles. In both cases, the increase in the electrical and thermal conductivity is primarily due to the increase in bundle size; the changes in network connectivity have a minor effect on the transport. Our results have broad implications for filamentous networks of inorganic nanoassemblies composed of interacting tubes, wires and ribbons/belts.

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