Temperature Dependence of Thermal Boundary Resistances between Multiwalled Carbon Nanotubes and Some Typical Counterpart Materials

Abstract

We directly measured the temperature dependence of thermal boundary resistances (TBRs) between multiwalled carbon nanotubes (MWCNTs) and different materials at elevated temperatures. Using the steady-state heat flow and the noncontacted measurement method, we could conveniently obtain the TBR-temperature relations. Our results indicate that the TBR-temperature relations vary distinctively with different contact materials when heating temperatures change from about 300 to 450 K; that is, the CNT-metal TBRs increase with increasing temperatures, whereas the CNT-insulator TBRs decrease. As a comparison, the TBRs between superaligned MWCNTs were measured and we found that the CNT-CNT TBRs remain basically unchanged as temperatures increase. We also found that the magnitude of TBRs between MWCNTs and different materials could differ from each other significantly. These results suggest that the choice of the right electrode may have an obvious influence on the thermal properties and other properties of the CNT-based devices. From another perspective, in view of some existing theoretical models about TBRs, our results support the validity of the molecular dynamics (MD) simulations in the calculation of CNT-solid TBRs at elevated temperatures.

Interfacial Thermal Conductance and Thermal Rectification of Hexagonal BCnN/Graphene In-Plane Heterojunctions

“…Although intensive studies were performed on the TR in asymmetric graphene sheets of different structures ,,, and thickness, limited studies were carried out on the TR of h-BN/graphene or other heterojunctions . The TR value in a heterostructure is obtained based on the ITC which can be measured experimentally using various approaches such as the steady-state method, the 3ω method, and time-domain thermoreflectance . Recently, the ITC between graphene and h-BN surfaces in a vertical h-BN/graphene heterostructure was measured by Raman spectroscopy .…”

Directly measuring of thermal pulse transfer in one-dimensional highly aligned carbon nanotubes

“…The parallel thermal diffusivities are bigger than the corresponding perpendicular thermal diffusivities by almost one order of magnitude (Figure 3). This is mainly due to the fact that the heat transfers much more efficiently along the CNT aligned direction than that across the CNT aligned direction3233.…”

Thermal rectification and negative differential thermal conductance in harmonic chains with nonlinear system-bath coupling

“…Nonlinear system-bath coupling is non-trivial. The experiments on thermal boundary conductance (interfacial thermal conductance) [65][66][67][68][69][70][71][72][73][74][75][76][77][78] reveal that the inelastic phonon scattering at interface between highly dissimilar materials is the dominant reason for the enhancement of heat current. Additionally, at the interface between similar materials, the suppression of heat current relative to the elastic thermal conductance is also observed [66,77].…”

“…In low-dimensional systems, thermal boundary conductance (also referred to as interfacial thermal conductance) becomes increasingly important [2,3,64]. At high temperature, many experimental [65][66][67][68][69][70][71][72][73][74][75][76][77][78], computational [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93], and empirical [94][95][96][97][98] approaches have uncovered that the thermal boundary conductance at weakly bonded interface (or interface between highly dissimilar materials) exceeds the upper bound of elastic thermal conductance and nearly increases linearly with temperature. These results reveal that inelastic phonon scattering at interface contributes significantly to thermal boundary conductance.…”