Tuning of Structural and Optical Properties of Graphene/ZnO Nanolaminates

Zinc oxide (ZnO) and graphene (G) have been extensively studied because of their unique physical properties. Here, graphene–zinc oxide (G/ZnO) nanolaminates were fabricated, respectively, by chemical vapor deposition and low-temperature atomic layer deposition technique. The number of obtained G/ZnO layers was tuned from 1 to 11 with a total thickness of 100 nm for all prepared nanolaminates. The structure, optical properties, and interaction between G and ZnO were studied by X-ray methods, TEM, AFM, Raman, and optical spectroscopy. The obtained results were interpreted and analyzed taking into account strain and charge effects of graphene in G/ZnO nanostructures. We demonstrate that the bottom graphene used as a substrate stimulated the formation of ZnO crystalline structure. n-Doping of graphene caused by charge transfer from ZnO to graphene has been detected by blue-shift of G-band of Raman spectra of the nanolaminates. ZnO photoluminescence intensity was found to be dependent on the number of graphene...