<span>ZnO 3D nanostructures composed of an array of 1D nanowires and 2D nanowalls were synthesized by chemical vapor deposition (CVD) method on c-plane GaN epilayer covered sapphire substrate. The nanowire growth followed vapor-liquid-solid (VLS) growth mechanism and the nanowall growth followed vapor-solid (VS) growth mechanism. The substrate was covered by 5 nm Au film deposited by thermal </span><span>evaporation. High purity ZnO powder and oxygen were used as the source materials and argon as carrier gas. The growth temperature was 900 C. The nanostructures grew vertically along polar c-plane orientation. The field emission scanning electron microscopy (FESEM) show the top view of the 3D nanostructures. The image was taken at Swagelok Center for Surface Analysis of Materials (SCSAM) at CWRU.</span>

ZnO nanowires and nanowalls 3D nanostructures

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