▎ 摘　　要

Thermal conductivity of graphene nanoribbons modified by atomic substitution is studied by molecular dynamics simulations. The substitutional doping by nitrogen, boron or silicon results in a non-linear decrease of thermal conductivity (kappa) as the dopant concentration (eta) is increased, suggesting a saturation in kappa when a certain value of eta is reached. Beyond dopant concentration, the overall profile of ( )kappa shows a strong dependence on edge chirality and the atomic mass of the substitutional atom.