Figure 1
From: Graphene wrinkling induced by monodisperse nanoparticles: facile control and quantification
Preparation scheme of the 1-LG@NPs samples.
The single-layer graphene (1-LG) was obtained by CVD technique (left panel, green) and transferred with the help of PMMA on SiO2(300 nm)/Si substrate decorated with fixed monodisperse (9 ± 0.5 nm) iron oxide nanoparticles (NPs). The density of NPs was adjusted by initial concentration of the dispersion of NPs in hexane, which was deposited on the substrate by spin-coating (bottom panel, orange). The NPs were fixed on the substrate by carbonization of the organic coating (oleic acid). The oleic acid coated NPs were obtained by decomposition of organic precursor in high boiling solvent (right panel, blue). The final 1-LG@NPs nanostructures, obtained after removal of the PMMA are shown in the middle top panel and form three limit cases: I. Low wrinkling regime - 1-LG sheet is in contact with the substrate in the area between the NPs (low NP density), II. Intermediate wrinkling regime – less of the 1-LG is in contact with the substrate, the layer is partially delaminated and III. High wrinkling regime - 1-LG sheet is significantly delaminated from the substrate (high NP density).
