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Fabrication, Characterization of Porous Anodic Alumina and Its Special Porperties

Author: HanXiaoYu
Tutor: ShenWenZhong
School: Shanghai Jiaotong University
Course: Condensed Matter Physics
Keywords: Porous alumina template Modified two-step oxidation Index of refraction Bifurcation structure
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 131
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Abstract


In recent years, porous alumina template rapid development, the preparation process is simple, tunable pore size range, has a good prospect of application of the material preparation, photonic crystals. The main content of the paper is to introduce a modified two-step oxidation, and discusses the various experimental factors on the template morphology. In addition, we also use spectrum detection means of the optical constants of the template, and to explore the formation mechanism of the template bifurcation structure. This article first briefly introduces the concept of nanotechnology and the main characterization methods. Then details the research progress of the porous anodic alumina, including PAA membrane structure model aspects of the formation mechanism of the preparation process and application, and strive to have a comprehensive and accurate understanding of the PAA film. On the basis of the anodic oxidation method of the conventional two-step oxidation with high field, a modified two-step oxidation method, we first high field anodizing in oxalic acid solution, and then a second low in phosphoric acid solution field anodizing hole spacing in between 220nm to 350nm ordered alumina template overcome the defects of the high field oxide using oxalic acid solution hole in the pore structure, breaking the limit must exceed the voltage of 160V oxidation using a phosphoric acid solution. The key to the success of the modified two-step oxidation is the oxidation time left highly ordered guiding role of the pits. We discussed further oxidation voltage, solvent composition, and a water bath temperature, and other experimental factors. Once the oxidation voltage determines the hole spacing, pore size by changing the solvent composition, the water bath temperature, and the secondary oxidation voltage to regulate the reaction temperature can be extended to 20 ° C, growth rate formula we calculated reaction energy. Studies using the two-step oxidation method to obtain the optical properties of the alumina template, based on the transmittance spectra, we use a modified four-layer medium model to calculate the refractive index varies with the wavelength, and a combination of different oxidation voltage obtained template light The photoluminescence spectrum we analyzed the change in refractive index mainly due to the phosphate impurity caused, and the influence of alumina molecular structure. When the oxidative voltage is less than self-ordering voltage, the template will be branching structure, for which we studied the the bifurcation structure formation and influencing factors, by phosphoric acid and oxalic acid electrolyte experiments, we believe that it is by the reaction process compression of the oxygen bubbles generated at the bottom of the template in the oxide layer is caused. In the oxidation voltage is small, the water bath temperature is higher, the self-assembled stress is smaller, loose structure of the oxide layer, the pressure in the oxygen bubbles within the procure the oxide layer obliquely growth generate bifurcated. Bifurcated structure is also affected by the solution was stirred the circumstances and electrolyte type. The above research was supported by the National Key Basic Research and Development Plan of nano Program (2010CB933702) and the National Natural Science Foundation of China (10734020), funded to thank!

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