title: Complex ZnO nanotree arrays with tunable top, stem and branch structures.
abstract: Hierarchical tree-, mushroom- and cockscomb-like ZnO arrays with increasing branching order and complexities have been grown in situ on cheap zinc plates by a simple hydrothermal oxidation approach. Their morphology, crystal structure and orientation relationship are characterized by powder X-ray diffraction, scanning electron microscopy (SEM) and cross-sectional high-resolution transmission electron microscopy (HRTEM). The wurtzite ZnO arrays, growing mainly in the [0001] direction, show a special orientation relationship between the stem and the branch as well as a novel stem-branch boundary which might be attributed to the least mismatch between [symbol: see text] and (0002) lattice planes. The co-solvent ethylenediamine (en) was used to control the morphology and complexing of these complex ZnO nanostructures. Correspondingly, the physical properties of ZnO nanostructure assembly arrays were tuned and a stronger UV emission was observed with negligible emissions in the visible range, indicating the highly crystalline features of the complex ZnO micro-/nanostructured materials.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies/MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen (Zhongshan) University, Guangzhou, P R China.
authors.forename: Fenghua
authors.initials: F
authors.lastname: Zhao
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Zheng
authors.forename: Xianfeng
authors.initials: X
authors.lastname: Yang
authors.forename: Xiuyan
authors.initials: X
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Fuli
authors.initials: F
authors.lastname: Zhao
authors.forename: Kam Sing
authors.initials: KS
authors.lastname: Wong
authors.forename: Chaolun
authors.initials: C
authors.lastname: Liang
authors.forename: Mingmei
authors.initials: M
authors.lastname: Wu
mesh_terms: D005029:Ethylenediamines / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D005029:Ethylenediamines; C031234:ethylenediamine; D015034:Zinc Oxide