Three-dimensional self-assembled graphene aerogels (GAs) are successfully developed by a simple chemical reduction with L-ascorbic acid at low temperature. And for the first time, the relationship among morphologies, electrical and thermal properties of GAs is studied comprehensively by controlling reaction conditions. The electrical conductivities of the GAs are also improved by four times after an annealing at 400 degrees C for 5 h under Ar environment. The results are very useful to optimize the best morphology, electrical and thermal properties of GAs for the best performance of GA-based electrodes of energy storage devices such as supercapacitors and batteries. (C) 2013 Elsevier B. V. All rights reserved.