Nonlocal thermal transport across embedded few-layer graphene sheets

Y Liu and ST Huxtable and B Yang and BG Sumpter and R Qiao, JOURNAL OF PHYSICS-CONDENSED MATTER, 26, 502101 (2014).

DOI: 10.1088/0953-8984/26/50/502101

Thermal transport across the interfaces between few-layer graphene sheets and soft materials exhibits intriguing anomalies when interpreted using the classical Kapitza model, e. g. the conductance of the same interface differs greatly for different modes of interfacial thermal transport. Using atomistic simulations, we show that such thermal transport follows a nonlocal flux-temperature drop constitutive law and is characterized jointly by a quasi-local conductance and a nonlocal conductance instead of the classical Kapitza conductance. The nonlocal model enables rationalization of many anomalies of the thermal transport across embedded few-layer graphene sheets and should be used in studies of interfacial thermal transport involving few-layer graphene sheets or other ultra-thin layered materials.

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