A novel ZnO structure called nano-coral pillar was successfully fabricated by hydrothermal growth method at low temperature. The effect of seed layer on formation of the nanostructure on the borosilicate glass substrate was discussed. Structural and morphological features of the products were studied by x-ray diffraction (XRD) and scanning electron microscopy (SEM). Also, the photocatalytic activities of the nanostructure for decompositions or removing of methylorange (MO) in aqueous solution were appraised. The results indicate that hydrothermal growth on the seed layer leads to the decrease in the diameter of the rods so that at a constant concentration compared with the case without seed layer the diameter of the nanorods decreases to reach below 100 nm which results in a new highly crystallize ZnO nanostructure that named it nano-coral pillar due to its resembling to a natural structure with this name.

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