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One -dimensional array of Preparation and Properties

Author: XuZuo
Tutor: JiangLinHua
School: Hohai University
Course: Materials Science
Keywords: Nanoarray Porous alumina Anodizing Perpendicular magnetic recording Magnetization reversal photoluminescence
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 267
Quote: 2
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Abstract


One-dimensional systems are used in electronics and optical exciton effective transmission minimum latitude structure, is expected to become functional nanoscale devices and integrated key. Since porous alumina membrane has a unique array of nanoscale columnar porous structure, use it as a template to synthesize a variety of one-dimensional nanostructures materials, therefore, assembled porous alumina template method design nanostructured materials has become the field of nanomaterials hot spots. In this thesis, two-step anodization method, oxalic acid electrolyte has successfully prepared highly ordered nanoscale pores of porous anodic aluminum oxide template, using scanning electron microscopy (SEM), atomic force microscopy (AFM) and X-ray diffraction (XRD) and other means to study the structure of the porous alumina membrane morphology and growth mechanism. Experimental results show that the porous aluminum oxide film is amorphous structure, which consists of two layers of the porous layer and the barrier layer composed of a porous layer of the hexagonal close-packed, the column parallel holes, evenly distributed, dense non-porous barrier layer, and compared to the thickness of the porous layer is much smaller. Porous alumina template deposition method using alternating holes in the template successfully assembled ferromagnetic metals Co, Ni, CoNi alloy nanowire arrays and ferromagnetic metal - nonmetal CoP alloy nanoparticles arrays. By SEM, transmission electron microscopy (TEM), XRD, etc., on the assembly system for structural characterization showed that Co, Ni and CoNi alloy nanowire array system uniform and orderly, the larger shape anisotropy (aspect ratio of 30 or more) , a significant crystalline preferred orientation; while CoP alloy microstructure morphology of nano-arrays of discrete nanoparticles, its crystal structure is amorphous. Of Co, Ni, CoNi alloy nanowire arrays system for magnetic analysis, VSM test results show a clear nanowires magnetic anisotropy, suitable for perpendicular magnetic recording media. Through the sample before and after annealing macroscopic magnetic properties, and to explore the alternating magnetic nanowires deposited magnetization reversal mechanism. Additionally, this article is still porous alumina template using alternating deposition method attempts to prepare CdS semiconductor nanomaterials, and their morphology and optical properties of the structure preliminary studies indicate that CdS nanowires with wurtzite structure, and along certain preferential growth direction. CdS nanowires assembled porous alumina template with an empty template compared to its photoluminescence intensity was significantly enhanced.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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