▎ 摘　　要

In this report, we propose an easy and viable fabrication method for growing multilayer graphene (MLG)-encapsulated nickel nanoparticles (Ni NPs) via a one-step continuous aerosol process comprising combined spray pyrolysis (SP) and thermal chemical vapor deposition (CVD). A bimodal size distribution was observed for the Ni NPs owing to droplet-to-particle and gas-to-particle conversions undergone in the SP at similar to 1000 degrees C. The number of graphene layers grown on the surface of Ni NPs in the thermal CVD was controlled by varying the reaction temperature of 300-700 degrees C, which perturbed the solubility and diffusion rates of carbon in NiNPs. Finally, we demonstrated that the MLG-encapsulated NiNP-added nanoenergetic materials were stably ignited by flash irradiation in a short ignition delay time (similar to 267 mu s) with fast burn rate (similar to 200m.s(-1)). This suggests that the MLG-encapsulated Ni NPs could play an important role as potential optical igniters for practical thermal engineering applications. (C) 2020 Published by Elsevier B.V.