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Study on Preparation and application of porous alumina membrane

Author: XuHuanHuan
Tutor: YeYongHong
School: Nanjing Normal University
Course: Optical Engineering
Keywords: Anodic Aluminum Oxide (AAO) membrane Anodization Electrochemical deposition refractive index Gold nanowires Raman scattering
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Type: Master's thesis
Year: 2013
Downloads: 90
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Abstract


Fabrication of porous anodic aluminum oxide (AAO) template has been attracted lots of attention in the field of nanoscale material science. Most researchers mainly study the preparation of porous alumina membrane with uniform pore structure and diameter size, namely the routine preparation of porous alumina template. Gradually people begin to fabricate AAO template with special morphological structure. The hole structures and sizes can be varied by controlling key factors such as electrolyte types, temperature and electric field intensity, and a variety of special morphology of porous alumina template have been fabricate successfully. In addition, the AAO template is widely used in preparation of metal nanowires. Gold nanowires array is an outstanding candicate for surface enhanced Raman scattering.We experimentally fabricated porous alumina membrane templates with special morphology and alumina/gold nanowires assembling film in this thesis, and carried out the researches based on these two samples. The main contents are described as follows:1. We developed a fabrication technique for special AAO template by changing electrode shape, location and the electrolyte voltage values. The scanning electron images of AAO films showed that the hole diameters of the membrane changes more obviously than the hole thickness. We also found that the refractive index distribution of this special template showed a radial change. The ray tracing simulation and actual experimental results of parallel light incident on AAO membrane were compared and analyzed.2. Au nanowires were fabricated by AC electrodeposition of Au inside the pores of the conventional AAO template. Optical spectroscopy was used to measure the transmission spectra of the composite films. Due to the excitation of transverse and longitudinal surface plasmon resonances, the transmission spectra of the samples were sensitive to the incident angle for P-polarized light, and the length of the gold nanowires. The length of Au nanowires that exposed to the surface could be controlled by the dissolving time in H3PO4. Using Rhodamine6G(Rh6G) as the probe molecule, we discovered that Raman scattering intensity changed as the length of Au nanowires changed, but the frequency did no shift.

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