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Title: Doped and un-doped complex ZnO nanostructures: Growth and Properties
Authors: Ahmad, Umar
Keywords: Doped and un-doped complex ZnO nanostructures: Growth and Properties
Issue Date: 2009
Abstract: Zinc oxide (ZnO) nanostructures are one of the most promising photonic materials due to their wide band gap (3.37 eV) and larger exciton binding energy (60 meV) larger than other semiconductor materials such as ZnSe (22 meV) and GaN (25 meV). The exotic nature of ZnO makes it a valuable material for various applications, for instance, sensors, room temperature UV lasers, solar cells, photocatalysts, field effect transistors, nano-resonators and nano-cantilevers, and so on. It is generally believed that the properties of nanostructured materials are strongly dependent on their shapes and sizes. In this endeavor, recently scientists are inclined to pay much attention on the fabrication of materials with specific morphologies because of the expectation of novel properties. Fabricating hierarchical nanostructures consisting 1D ZnO moieties in a controllable manner is required to improve the performance and to broaden the application, but one still faces remarkable challenges. Here, we present the growth and optical properties of hierarchical doped and un-doped ZnO nanostructures composed of hexagonal ZnO nanorods synthesized by the simple thermal evaporation process using metallic zinc powder in the presence of oxygen. The hexagonal nanorods are grown over the six-facets of core nanorod. The typical lengths and diameters of the grown nanorods are about 1.5-2 m and 30-40 nm respectively. The detailed structural characterizations by HRTEM, XRD and SAED confirmed that the as-grown ZnO branched structures are single crystalline and all the nanorods in the branched structure is grown along the [0002] direction in preference. The detailed optical properties of these structures confirmed the good optical properties for the as-grown structures.
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