Vertically aligned ZnO nanostructures grown on graphene layers

Yong-Jin Kim; Jae-Hyun Lee; Gyu-Chul Yi
November 2009
Applied Physics Letters;11/23/2009, Vol. 95 Issue 21, p213101
Academic Journal
We report the vertical growth of ZnO nanostructures on graphene layers and their photoluminescence (PL) characteristics. ZnO nanostructures were grown vertically on the graphene layers using catalyst-free metal-organic vapor-phase epitaxy. The surface morphology of the ZnO nanostructures on the graphene layers depended strongly on the growth temperature. Further, interesting growth behavior leading to the formation of aligned ZnO nanoneedles in a row and vertically aligned nanowalls was also observed and explained in terms of enhanced nucleation on graphene step edges and kinks. Additionally, the optical characteristics and carbon incorporation into ZnO were investigated using variable-temperature PL spectroscopy.


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