▎ 摘　　要

By continuously varying the structure of graphene oxide paper (PRGP) using Joule heating annealing, we are able to tune its electrical conductivity (sigma) and thermal diffusivity (alpha) in a very wide range: more than three orders of magnitude for sigma (186-503009 S/m) and 10-fold for alpha (8.31 x 10(-7) m(2)/s to 9.31 x 10(-6) m(2)/s). Excellent coherency-linear relationship between sigma and alpha is discovered although they are sustained by different carriers: electrons and phonons. Such coherency exists over two sections: sigma > 2 x 10(4) S/m, and 10(3) < sigma < 2 x 10(4) S/m. A two-component parallel structure is proposed to interpret the observed discovery. The slope of alpha similar to sigma relation reflects the ratio of difference in alpha between the two components over sigma of the ordered structure. The intercept of alpha similar to sigma relation reflects the alpha of the disordered structure. It is found the alpha of disordered structure in our PRGP agrees well with that of amorphous carbon. Past work on carbon nanocoil, graphene paper, graphene oxide film, and graphene fiber also reveals linear coherency between alpha and sigma. However, there are no uniform slope and intercept while they are close for similar materials. The parameters of the linear coherency strongly depend on the two structures in the material. (C) 2021 Elsevier Ltd. All rights reserved.