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Pressure-Induced Growth Evolution of Different ZnO Nanostructures by a Pulsed Laser Ablation Method

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ZnO nanostructure growth evolution from well-aligned two-dimensional nanowalls to one-dimensional nanowire arrays and finally to zero-dimensional nanoparticles was successfully demonstrated by a pulsed laser ablation and deposition growth method, where the growth pressure was proved to be the determinant factor for the formation of different ZnO nanostructures. At lower pressure, nanowall grew due to a prefer nucleation at the grain boundary of a ZnO wetting layer via a vapor–solid process. At middle growth pressure, the ZnO nanowire growth can be described with a nanoparticle-assisted pulsed laser deposition process. At higher growth pressure, due to the strong collision between the ablated ZnO clusters and background gas, only nanoparticles were deposited. These ZnO nanostructured arrays had a preferred c-axis growth orientation on c-cut sapphire substrates. The photoluminescence and field emission properties were also studied.
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Keywords: FIELD EMISSION; HIGH-PRESSURE PLD; NANOWALL; NANOWIRE; ZNO

Document Type: Research Article

Publication date: March 1, 2012

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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