▎ 摘　　要

This letter investigates thermal rectification (TR) in graphene-carbon nanotube (GN-CNT) junctions formed by SWCNT(12, 12) connected with a single-layer graphene nanosheet (GN-SWCNT(12,12)). It is found that the TR ratio of CN-SWCNT junction can be enhanced dramatically by tuning the chirality of the pillar. TR ratio of the GN-SWCNT(12,12) junction can respectively reach up to 1487% and 2586.4% at temperatures of 300K and 200K (vertical bar Delta vertical bar = 0.5), much higher than those previously reported for the pillared graphene and GN-CNT junctions. The influences of the geometric parameters on the thermal rectification are discussed. The results could offer useful guidelines to the design and performance improvement of the GN-CNT-based thermal rectifier. Copyright (C) EPLA, 2018