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Synthesis and Characterization of Zinc Oxide Nanostructures Using Citrus aurantifolia Extracts

Synthesis of ZnO nanostructures has been demonstrated by using fresh extract of Citrusaurantifolia and zinc acetate dehydrate as a source material. Citrus aurantifolia extract was found to be a very effective agent for the reduction of Zn ions. The pH value of growth solution was set up to be 5 (acidic), 7 (neutral) and 9 (alkaline). The structural and optical properties of ZnO nanostructures have been investigated using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and Photoluminescence (PL). By varying the pH, all samples exhibit rod-like structure however the length and diameter of the rod was varied. XRD demonstrated that all samples can be indexed to hexagonal wurzite structure with preferential orientation in (101) reflection plane. The room temperature PL spectrum was also analyzed which have shown a deep level emission which related to various intrinsic defects such as Zn interstitials and oxygen vacancies.