Lattice dynamics, thermal properties

Changing the thermal conductivity of the percolation network of carbon nanotubes through functionalization

S. N. Kapustin, A. S. Loginova, Yu. V. Tsykareva

Northern (Arctic) Federal University named after M. V. Lomonosov, Arkhangelsk, Russia

Abstract: A study on the dependence of the thermal conductivity of percolation systems of carbon nanotubes (CNTs) on the type and degree of functionalization, number of defects has been carried out. The influence of the most commonly used -COOH, -OH and -CONH$_2$ groups has been studied. A nonlinear dependence of conductivity on the number of functional groups has been detected. A small number of functional groups can improve conductivity, while a large number reduces it. We assume the existence of competing processes that increase thermal conductivity (changes in the geometry of CNTs, improved contact between them) and increase phonon scattering (the appearance of defects and scattering centers). The data can be used for manipulating the thermophysical properties of CNTs, as well as selecting the optimal degree of functionalization while developing composites and nanodevices.

Keywords: carbon nanotubes, thermal conductivity, functionalization, percolation network.

Received: 23.12.2023
Revised: 16.02.2024
Accepted: 29.02.2024

DOI: 10.61011/FTT.2024.04.57802.277

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