Various forms of Graphene and Graphene Oxide (GO) are potentially toxic and not good for the body.
Took me a while to find ( my file skills suck- thxs for global search), but I dug up the reference from a few years back.
https://particleandfibretoxicology.biomedcentral.com/articles/10.1186/s12989-016-0168-y
Perhaps the technique is a combination of liposomal delivery of the mRNA and an inflammatory agent that enhances the bodies immune response to the spike proteins produced by the mRNA to make the vaccine more effective.
If so, I'm impressed with the approach, but the implementation could be implicated with of some of the negative side effects that are being reported.