(a) Schematic illustration of the formation of PEG-functionalized reduced graphene oxide-coated gold superparticles via an emulsion-based self-assembly method. (b) NIR light-triggered acoustic and thermal theranostics based on PEG-functionalized reduced graphene oxide-coated gold superparticles for in vivo cancer therapy. Reproduced from ref. 163 with permission from the Royal Society of Chemistry.