Fig. 1

Flakes characterisation. a Optical absorption of the graphene and h-BN inks shown in the inset. Atomic force microscopy statistics indicating the thickness (b) and the lateral flake size distribution (c) for the graphene and h-BN inks. d Scanning electron microscopy images of the graphene flakes ~ 200 nm, (inset) starting graphite ~ 400 μm. e h-BN flakes ~ 516 nm and (inset) starting bulk h-BN ~ 5 μm. Transmission electron microscopy micrographs of few layer graphene (f) and h-BN (g) flakes