Issue 24, 2019

A graphene-based smart thermal conductive system regulated by a reversible pressure-induced mechanism

Abstract

Thermal dissipation and thermal insulation are important for maintaining the normal operation of devices, extending the service life of instruments, ensuring efficient energy utilization, and improving temperature-related human comfort. Yet it is difficult to achieve both the functions of thermal dissipation and thermal insulation in a single material with a specific thermal conductivity under specific conditions. In this work, based on the huge difference in thermal conductivity between air and reduced graphene oxide (rGO), a pressure-induced mechanism is used to regulate the amount of air inside an rGO foam, so that a periodic reversible change of thermal conductivity can be realized, achieving the dual functions of thermal dissipation and thermal insulation to meet the requirements of different application scenarios. Further fitting calculations suggest that the thermal conductivity of rGO foam is positively and negatively associated with the applied pressure and temperature, respectively, and it can be calculated for given pressure and temperature conditions. The pressure-induced reversible regulation of thermal conductivity in rGO foam provides a new design construct for smart thermal-management devices, and a new direction of application for 2D materials.

Graphical abstract: A graphene-based smart thermal conductive system regulated by a reversible pressure-induced mechanism

Supplementary files

Article information

Article type
Paper
Submitted
12 Mär 2019
Accepted
23 Mai 2019
First published
25 Mai 2019

Nanoscale, 2019,11, 11730-11735

A graphene-based smart thermal conductive system regulated by a reversible pressure-induced mechanism

X. Wang, X. Zang, Y. Jiang, Q. Liu, S. Chang, J. Ji, H. Zhao, Y. Liu and M. Xue, Nanoscale, 2019, 11, 11730 DOI: 10.1039/C9NR02160D

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