▎ 摘　　要

The electronic thermal conductivity (ETC), K-e, of suspended graphene (SG) is studied for 15 < T< 400 K, following the Boltzmann transport formalism. The electrons are considered to be scattered from defects along with the intrinsic in-plane acoustic phonons, out-of-plane flexural phonons (EPs) and optical phonons. The ETC is evaluated by computing the first-order perturbation distribution function by directly solving the linearized Boltzmann equation by an iterative method. Numerical calculations of the temperature and concentration dependences of K-e show the dominance of charged impurity scattering at lower temperatures (T < 75 K) and of EPs at higher temperatures. The results are compared with the commonly used low-temperature and high-energy relaxation time approximations. Our calculations are in good agreement with recent K-e data extracted for high-mobility SG samples. The validity of Wiedemann-Franz law is also discussed. (C) 2015 Elsevier By. All rights reserved,