Fabrication, structure, and photoluminescence of GeO2/ZnO core-shell nanorods

Abstract

We have fabricated GeO2-core/ZnO-shell nanorods using the atomic layer deposition technique to shell-coat the GeO2 nanorods. The samples were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and photoluminescence spectroscopy (PL). The coated product showed a rod-like morphology, in which the shell layer comprised a hexagonal ZnO phase. PL measurement of GeO2-core/ZnO-shell nanorods exhibited emissions from the ZnO shell layer, in addition to those form the GeO2-core nanorods.