title: Ga-assisted synthesis and optical properties of ZnO submicron- and nanotowers.
abstract: Tower-like ZnO submicron- and nanostructures were synthesized by simply evaporating a mixture of Zn and Ga. Scanning electron microscopy and transmission electron microscopy observations showed that the regular hexagonal tower-like structure is likely to be made up in a layer-by-layer fashion and consist of sheets. According to our experiments, the amount of Ga has a large effect on their morphologies. The growth of such tower-like structures is ascribed to the vapor-solid mechanism. The introduction of Ga hinders the growth of ZnO along the [0001] direction, resulting in the formation of the novel tower-like structures. In addition, the photoluminescence of such structures shows a strong green-light emission.
authors.affiliation: Department of Physics, Harbin Normal University, Harbin, 150080, People's Republic of China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Liang
authors.forename: Xitian
authors.initials: X
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Qin
authors.forename: E
authors.initials: E
authors.lastname: Zhang
authors.forename: Hong
authors.initials: H
authors.lastname: Gao
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Zhang