I have synthesized ZnO nanorods from different concentrations with hexagonal shape, but at some concentrations(1 mM, 3 mM,7 mM) round rods with rough surface are observed instead of hexagonal shape (see the attachment) . while at the other (2 mM,4 mM,6 mM,8 mM) concentration hexagonal shaped nanorods are obtained.

My question is that why and how ZnO nanorods in round shape is formed? and what is the actual mechanism behind this.  

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