Dear Fatemeh,
As I look into the SEM micrograph I remember that the nanorod dimensions depended on the hydrothermal reaction parameters. The optimum hydrothermal reaction parameters to produce blunt tip-like nanorods also nanorods grew in a c-axis preferred orientation. Normally they have high optical property and crystallinity. in addition, nanorods because the interfacial energy between crystals and substrate is usually smaller than the interfacial energy between crystals and solution. I think the agglomeration and heating temperature avoid the process to fabricate z-direction nanorod. however, the XRD can prove your result with maybe AFM.
It looks like one-dimensional structure or rods but highly agglomerated. To call it nanorod one need scale in the micrograph. It is having its dimension in nano range we can call it as nanorods
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