Nanoscale Graphene Disk: A Natural Functionally Graded Material --The   Thermal Conductivity of Nanoscale Graphene Disk by Molecular Dynamics   Simulation
  In this letter, we investigate numerically (by non-equilibrium molecular dynamics) and analytically the thermal conductivity of nanoscale graphene disks (NGDs), and discussed the possibility to realize FGM with only one material, NGDs. We found that the NGD has a graded thermal conductivity and can be used as FGM in a large temperature range. Moreover, we show the dependent of NGDs' thermal conductivity on radius and temperature. Our study may inspire experimentalists to develop NGD based FGMs and help heat removal of hot spots on chips by graphene. 
Nuo Yang, Shiqian Hu, Dengke Ma, Tingyu Lu, Baowen Li
cond-mat.mtrl-sci physics.comp-ph