shows the SEM images of samples No. 1, 2 and 3 achieved at different temperatures involving 30 8C, 50 8C and 70 8C,respectively. It can be observed that with increasing the reaction temperature from 30 8C to 70 8C, the size of the nanostructures and
their agglomeration enlarged. Results of SEM reveal that 50 8C temperature is the best temperature in our reaction conditions (approved by Fig. 2a), therefore other reactions were executed at this temperature.