Stabilization of ε-CL-20 crystals by a minor interfacial doping of polydopamine-coated graphene oxide

•Various modified CL-20 crystalline composites with graphene/polydopamine as the dopants have been prepared;•These CL-20 based composites have improved thermal stability, and lower mechanical sensitivity;•Some of the abovementioned CL-20 based composites have even higher density with exclusion of polymorphic transition;