Controllable synthesis of SiC@Graphene core‐shell nanoparticles via fluidized bed chemical vapor deposition

Abstract

SiC@Graphene (SiC@G) core‐shell nanoparticles were successfully prepared by a facile fluidized bed (FB) chemical vapor deposition (CVD) method. SiC@G core‐shell nanoparticles with an average size of 10 nm and graphene from 1 to 5 layers with a controllable thickness were obtained by finely adjusting the experimental temperatures. The formation of SiC nanoparticles and graphene layers was confirmed by the results of X‐ray diffraction (XRD) and Raman Spectroscopy. The graphene content in SiC@G core‐shell nanoparticles prepared at different temperatures was measured from thermogravimetric analysis (TG), which varied from 5.89% to 11.88 mass%. From X‐ray photoelectron spectroscopy (XPS) results, no absorption assigned to Si‐O band was detected, indicating the effective protection of the SiC nanoparticles against oxidation by the graphene shell to resist oxidation of SiC nanoparticles. This novel method of preparation of SiC@G core‐shell nanoparticles could be applied to large‐scale production and find diverse applications in related fields.

Effect of Different Rotational Speeds on Graphene-Wrapped SiC Core-Shell Nanoparticles in Wet Milling Medium

“…Most importantly, the impact force between the graphite and the milling ball can be converted into shear force so that the shear force becomes the dominant force, which is more conducive to graphene peeling. Based on the experience brought by this experiment and this method, it is a problem worth exploring and discussing to change the ball milling speed and explore the influence of the rotational speed on the number of graphene layers, wrapping conditions and graphene quality [ 20 ]. At present, there is no relevant research on the preparation of graphene-wrapped SiC core-shell nanoparticles under wet milling media at different rotational speeds.…”