Thermal Transport in Nano Structured Carbon Nanotubes and Its Thermal Conductance

Abstract

We have studied thermal transport in nano-structured carbon nanotubes and havecalculated its thermal conductance using the nonequilibrium Green’s function method.The thermal conductance of carbon nanotubes linearly depended on the width of theunzipped part of the carbon nanotube but exponentially decayed and then convergedto a finite value of the unzipped length increased. But characteristics are unusual tocommon bulk materials but are universal to nano materials of nanotube and graphenelike structures. An exponentially decayed thermal conductance with the length wasfound at interfaces. Electronic conductance was found to show an exponential thermaltransport in carbon nanotubes showed features distinctly different from those incommon bulk materials. Carbon nanotubes have been found strong structuralimperfections; their thermal conductance exhibited unexpectedly perfect linear scalingbehavior as the width of the unzipped part changed. As the unzipped length increased,thermal conductance exponentially decreased by the one dimensional atomic chainmodel. The obtained results were found in good agreement with previous results