title: Low-temperature growth of flower-shaped UV-emitting ZnO nanostructures on steel alloy by thermal evaporation.
abstract: Flower-shaped ZnO nanostructures, containing the triangular-shaped petals (sharpened tips and wider bases) have been achieved by simple thermal evaporation of high purity metallic zinc powder in the presence of oxygen at 440 degrees C on steel alloy substrate without the use of metal catalyst or additives. Detailed structural studies confirm that the obtained flower-shaped nanostructures are single crystalline and possesses a wurtzite hexagonal structure, grown along the c-axis in the [0001] direction. Raman and room temperature photoluminescence analysis substantiate a wurtzite hexagonal phase with a good crystal quality and a strong UV emission at 378 nm, respectively, indicating few or no structural defects. Additionally, a detailed possible growth mechanism has also been discussed.
authors.affiliation: School of Chemical Engineering and Technology, Chonbuk National University, Chonju 561-756, South Korea.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Umar
authors.forename: S H
authors.initials: SH
authors.lastname: Kim
authors.forename: J H
authors.initials: JH
authors.lastname: Kim
authors.forename: Y K
authors.initials: YK
authors.lastname: Park
authors.forename: Y B
authors.initials: YB
authors.lastname: Hahn