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SEM images of (a) five times coated seeds, (b) twice coated seeds, (c) ZNRs grown on high concentration (0.044 M) seeds with the glimpse of seeds in the backdrop, (d) ZNRs running into one another because of the space confinement effect with the corresponding top view in the inset, (e) ZNRs grown on unseeded substrate, and (f) EDS of thin film ZnO seeds with the atomic ratio of the elements.
