Band Gap Engineering of ZnO Nanocrystallites Prepared via Ball-Milling

Authors : Telem ŞİMŞEK, Abdullah CEYLAN, Gülçin Şefiye AŞKIN, Şadan ÖZCAN

Pages : 89-94

Doi:10.2339/politeknik.647702

View : 54 | Download : 11

Publication Date : 2022-03-01

Article Type : Research Paper

Abstract :Zinc oxide insert ignore into journalissuearticles values(ZnO); nanostructures have become the foremost prevalent metal oxide materials for technological applications due to their tunable optical properties. However, a simple, cheap and green method is required for the mass production of these nanostructures. In the present investigation ball-milling technique was used to tune the band gap of ZnO nanocrystallites. Samples were synthesized using metallic Zn powder and distilled water via wet-milling followed by dry-milling. The crystallite size of the ZnO samples were determined in the range of 24.9 – 22.0 nm depending on the dry milling time. UV-vis absorbance measurements and Kubelka-Munk theory were used to calculate the band gap of the ZnO nanocrystallites. The energy band gap of the samples was successfully tuned in the range of 3.15 - 3.02 eV depending on the nanocrystallite size. This behavior was explained by the surface states and energy traps on the band edge, created by delocalization of molecular orbitals.
Keywords : bang gap engineering, dry milling, zinc oxide, wet milling

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