Nano Alumina Template And The Quantum Lattice Of Rare Earth Fluorescent Materials Preparation

Template-synthesis method is a kind of new technology to preparateof nanostructure system. It carries out in certain environment (liquid or gas phase) by atom's moving . Therefore nanostructure system can be fabricated. The physical properties of a nano structure material is controlled by changing structure size of the anodic aluminum oxide(AAO) templates. This method has been playing an important role in the fabrication of many kinds of nanostructure system. Recently this method is named Nano-copy. This synthesis method has been attracting more and more attention of the researchers.In this work, matrix of quantum dots of fabricated using AAO template and pulse laser deposition (PLD). The cylindrical pore array structure of AAO serves as a template for the preparation of the quantum dots. This new technical route is initiated by our research group. But there are some difficulties in the experimentation as follows :(1)the proportion of the AAO film thickness and diameter of nano-pores must be small. The proportion produced by normal method is too high about 5000. To make target materials to penetrate such a long "tunnel" is verydifficult.(2)the diameter size of nano-pores must be controlled. So that the quantum dot size can be different.(3) the AAO template should have a structure of highly hexagonal pore array structure.(4)the AAO templates demonstrate some weakness in application, such as, the low mechanical strength and low thermal stability.This thesis has summarized the newest progress of the AAO template application, technology and mechanism. The main results and conclusions can be summarized as follows :(l)we have put forward a new ideal of using the AAO template and PLDsynthesize matrix of quantum dots. And we successfully fabricate the fluorescence material quantum dots on the MgO substrate by this method. With realization of this method, nano-copy really come true. This research is one of international hot issue.(2)the AAO templates with highly ordered hexagonal nano-pores were synthesized by One-Step Anodization method and Two-Step Anodization method . The experiment results show that Two-Step Anodization method is better than One-Step Anodization method. The effects of reaction time , anodize voltage, pH value concentration, temperature have all been studied. Therefore precise hole-size 40~200nm controll has been realized.(3)the rare earth fluorescence material and the target for PLD were synthesized by high temperature solid state reaction .(4)the aluminum foil (99.996%) is annealed under controlled temperatures and duration. So the grain sizes were increased and the stress in the foil was released.