Insights into the interfacial thermal transport properties of in-plane graphene/h-BN heterostructure with grain boundary

•The symmetric tilt grain boundaries at the interface reduce the ITC of the GR/h-BN heterostructure.•The interfacial thermal energy transport ability of Model II is superior to Model I.•For Model II, at large tilt angles (i.e., 59.04° and 60°) the symmetric tilt grain boundaries have little influence on the ITC.