THE MODULATION OF INTERFACIAL THERMAL RESISTANCE IN GRAPHITE
CH Liu and ZY Wei and WY Chen and JK Yang and YF Chen, PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8A, UNSP V08AT10A006 (2015).
It is demonstrated though the nonequilibrium Green's function method that the interfacial thermal resistance (9) of graphite can be modulated by loading pressure in x direction, x and y directions and all three directions respectively in this paper. For graphite without pressure, the interfacial thermal resistance is about 8x10(-9) m(2)K/W. The pressure in the z direction from tensile -1GPa to compressive 10GPa can reduce the Omega by one order of magnitude, which is caused by the increase in the phonon transmission possibility resulting from the increase in the interlayer interaction strength. And the phonon transmission function has the phenomenon of blue shift in the low- frequency range during the process. The pressure in the x-y plane changes from -10GPa to 1.5GPa has slight impact on the phonon transmission and interfacial thermal resistance while there has no pressure or a small pressure in the direction. So pressure in the basal plane has slight effect on the interfacial thermal conductance and phonon transmission in the graphite. Furthermore, the discrete layer in the graphite separates mutually when the pressure reaches to the critical value 1-2GPa in the basal plane or to -2 similar to-1GPa in the z direction. It is worth noted that low-frequency phonons have larger phonon transmission due to longer mean free path and the soft van der Waals interaction between the neighboring layers. Our results suggest that the interfacial thermal resistance of graphite or few-layer graphene can be modulated in a large scope and then can be applied for both heat dissipation and insulation through the pressure engineering.
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