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Studies of structural and optical properties of zno nanorods and its influence of ph

Author: 
Thambidurai S., Venkatachalam M., Saroja M., Gowthaman P., Shankar S.
Subject Area: 
Physical Sciences and Engineering
Abstract: 

Zinc Oxide (ZnO) nano rods arrays have been grown on glass substrates with different pH by using a seed layer. ZnO seed layer thin films were prepared by Chemical Bath Deposition (CBD) method on glass substrates. Ammonia was used to achieve the desired pH value. ZnO seed coated thin films were immersed in aqueous solution for 4 hours at 90°C. Zinc nitrate hexahydrate was used as source of zinc ion, while hexamethylenetetramine solution served as the complexing agent. The effect of pH of precursor solution on the structural and optical properties of ZnO nano rods was investigated. They were characterized by means of XRD, SEM, UV-Vis spectroscopy and PL. XRD results indicated that the prepared nano rods were hexagonal wurzite structure. The optical measurement shows that there is a change in the band gap of nano rod arrays with changing the pH of the starting solution. SEM images reveal that the change in the pH value from 6.5 to 9 leads to change in the size of nano rods grown on substrate.

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