▎ 摘　　要

The pillared-graphene architecture proves to be a plausible attempt at integrating both graphene and carbon nanotubes in nanoelectronics. The similitude of both material compositions reduces mismatching of lattice vibrational spectra at their interfaces, thereby enhancing capacity as a thermal sink to extract heat. Unlike previous work, this study centers on the interpillar phononics in these pillared-graphene nanostructures (PGN). Classical molecular dynamics simulations are performed to emulate the phonon transport in PGN. It is evinced that intertube interaction diminishes the nanotube thermal conduction. The simulations show that long-wavelength out-of-plane modes contribute significantly to thermal conduction. A bidirectional mode propagation mechanism is proposed and believed to be indirectly responsible for the reduced thermal flux in PGN. Finally, parity analyses of three-phonon scattering selection rules further substantiate the notion of a dual-scattering nature of flexural modes. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3651089]