▎ 摘　　要

NOVELTY - Preparation of composite material comprising core-shell nanoparticles, the core comprises a material capable of absorbing light and the shell comprises graphene, involves (a) providing a substrate as well as an ink comprising nanoparticles capable of absorbing light and encapsulated in a polymeric matrix, (b) depositing the ink on a surface of the substrate, in which the surface or ink comprises a carbon source chosen from a polymer comprising an amide function and an aromatic function, a hexose, carbon nanoparticles and self-assembled monolayers comprising aromatic rings, and (c) illuminating the surface of the substrate covered with ink with pulsed light to bring the nanoparticles to a heating temperature greater than a dissociation temperature of the carbon included in the carbon source, and dissociating the carbon to diffuse or to dissolve in the nanoparticles. USE - Preparation of composite material with core-shell nanoparticles. Uses include but are not limited to electrodes for lithium batteries and triboelectric generators, sensitive elements of gas sensors and temperature-humidity sensors, pressure sensors, transistors and magnetoresistivity applications. ADVANTAGE - The composite material contains nanoparticles which enables excellent absorption of light.