We configured reaction solution using zinc acetate [Mg(CH

3

COO)

2

·H

2

O] and methenamine (C

6

H

12

N

4

) with a certain percentage

magnesium acetate [Mg(CH

3

COO)

2

·H

2

O] was added appropriately in the reaction so-lution.High quality ZnO microrods were prepared on the silicon substrate at 90℃ for 24 h by hydro ther malmethod.Surfacemorphology and crystal structure of ZnO microrods are analyzed

using scanning electronmicroscopy (SEM)and X-ray diffraction (XRD).The results show the sample presents a rod-like shape with a hexagonal cross sectionsand typicalmorphology of wurtzite ZnO.The ratio of length and diameterof the ZnO rod is about10:1.And the ZnO microrods grow along [002]

direction.Mg ions are not found in the sample

which probably played the role ofa cata-lyst.Photo luminescence (PL) spectrum of ZnO microrodswasmeasured.Room-temperature PL spectrum of the sam-ple shows an UV luminescence peak located at 384 nm

and the FWHM of the emission peak is only 13 nm

intensity of UV luminescence peak is stronger than thatofvisible luminescence peak

indicating the high quality of the sample.