A unified view on nanoscale packing, connectivity, and conductivity of CNT networks

Karthikeyan Gnanasekaran, Claudio Grimaldi, Gijsbertus de With, Heiner Friedrich (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The design of functional structures from primary building blocks requires a thorough understanding of how size, shape, and particle–particle interactions steer the assembly process. Specifically, for electrically conductive networks build from carbon nanotubes (CNTs) combining macroscopic characterization and simulations shows that the achievable conductivity is mainly governed by CNT aspect ratio, length dispersity and attractive interactions. However, a direct link between the actual 3D network topology that leads to the observed electrical conductivity has not been established yet due to a lack in nanoscale experimental approaches. Here it is shown experimentally for randomly packed (jammed) CNT networks that the CNT aspect ratio determines, as theoretically predicted, the contact number per CNT which in turn scales linearly with the resulting electrical conductivity of the CNT network. Furthermore, nanoscale packing density, contact areas, contact distribution in random and nonrandom configurations, and least resistance pathways are quantified. The results illustrate how complex nanoscale networks can be imaged and quantified in 3D to understand and model their functional properties in a bottom-up fashion.

LanguageEnglish
Article number1807901
Number of pages6
JournalAdvanced Functional Materials
Volume29
Issue number3
Early online date1 Jan 2019
DOIs
StatePublished - 4 Feb 2019

Fingerprint

Carbon Nanotubes
Carbon nanotubes
carbon nanotubes
conductivity
aspect ratio
Aspect ratio
electrical resistivity
Particle interactions
packing density
Complex networks
particle interactions
topology
assembly
Topology
configurations
simulation

Keywords

  • carbon nanotubes
  • characterization tools
  • composite materials
  • hierarchical structure
  • structure–property relationship

Cite this

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title = "A unified view on nanoscale packing, connectivity, and conductivity of CNT networks",
abstract = "The design of functional structures from primary building blocks requires a thorough understanding of how size, shape, and particle–particle interactions steer the assembly process. Specifically, for electrically conductive networks build from carbon nanotubes (CNTs) combining macroscopic characterization and simulations shows that the achievable conductivity is mainly governed by CNT aspect ratio, length dispersity and attractive interactions. However, a direct link between the actual 3D network topology that leads to the observed electrical conductivity has not been established yet due to a lack in nanoscale experimental approaches. Here it is shown experimentally for randomly packed (jammed) CNT networks that the CNT aspect ratio determines, as theoretically predicted, the contact number per CNT which in turn scales linearly with the resulting electrical conductivity of the CNT network. Furthermore, nanoscale packing density, contact areas, contact distribution in random and nonrandom configurations, and least resistance pathways are quantified. The results illustrate how complex nanoscale networks can be imaged and quantified in 3D to understand and model their functional properties in a bottom-up fashion.",
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A unified view on nanoscale packing, connectivity, and conductivity of CNT networks. / Gnanasekaran, Karthikeyan; Grimaldi, Claudio; de With, Gijsbertus; Friedrich, Heiner (Corresponding author).

In: Advanced Functional Materials, Vol. 29, No. 3, 1807901, 04.02.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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