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Yu N.,Dalian Nationalities University | Deng D.,Hong Kong University of Science and Technology | Yang D.,Dalian Lumei Optoelectronics Corporation | Wang Y.,Hong Kong University of Science and Technology | Yang T.,Dalian Lumei Optoelectronics Corporation
Journal of Alloys and Compounds | Year: 2010

ZnO interconnected network nanostructures are grown on cracked GaN substrate using aqueous solution method in this paper. ZnO nanostructures nucleate in the sidewall of crack and selectively grow along the crack direction on the GaN substrate. Due to the diversity of the crack, the nanostructures show interconnected network structures. Time-dependent of ZnO nanostructure morphology evolution shows the network nanostructures are formed by self-organized growth by interconnection of nanorods. The average diameter of the nanorods is around 500-600 nm. Micro-Raman spectroscopy shows the nanostructures are under tensile stress. Meanwhile, the nanostructures also show good optical quality. The interconnecting structure characteristics, high degree of networking make them potential applications in ultra-sensitive gas sensing, exciton based photonic devices. © 2010 Elsevier B.V.All rights reserved.

Yu N.,Dalian Nationalities University | Yiting L.,Dalian University of Technology | Cong Y.,Dalian Nationalities University | Cao B.,Dalian University of Technology | And 3 more authors.
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2010

Large-scale sunflower-like ZnO nanostructures are synthesized on the patterned sapphire by aqueous solutions. Due to the geometry of patterned sapphire, ZnO nanostructures are grown along the upper base and sidewall region on the frustum of a cone shaped sapphire forming sunflower-like morphology as a whole. Photo-fluorescence luminance (PL) spectrum of the sunflower-like nanostructures shows an excellent luminescence property. The large-scale periodical sunflower-like characteristics, make them useful for potential applications in ultra-sensitive gas sensing and exciton based photonic devices.

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