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Zinc oxide (ZnO) nanorod

Zinc oxide (ZnO) nanorod

 Zinc oxide has a hexagonal crystal structure and the growth speed in the C-axis is very high in the CVD growing process; thus, it tends to grow in rod (needle) shapes.
It is also possible to grow vertically oriented rods on a substrate if Au and Zn catalyst films are formed on the substrate.

ZnO tetrapods

ZnO nanorods on Si substrate