Abstract:
The main objective of this study was to investigate the lowering of the band gap energy and
optical properties of ZnO doped with alkaline earth metals (Ca2+
, Sr2+
, Mg2+). ZnO nanoparticle
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was synthesize by adding Zinc acetate to aqueous NaOH solution and subjected to ultrasonic
irradiation for 2 hr after that a white precipitate was obtained which was filtered and washed with
ethanol and de-ionized water and dried in an oven at 600C for 3 hr. The dried white powder was
then calcined at 400oC for 2 hr and subjected to UV-Vis spectrophotometer used to characterize
the synthesized ZnO nanoparticle and the band gap energy of ZnO undoped and doped with
alkaline earth metals (Ca2+,Sr2+,Mg2+) was determined. From all dopants 0.006 M Mg2+ doped
ZnO nanoparticles was found to be narrowing band gap more.
