Study On Preparation And Laser Microfabrication Of Polymer Nanocomposites

The use of the laser micro-fabrication (LMF) in two- and three-dimensional (2D and 3D) micro-fabrications for various fields'applications has been intensively studied. Since the laser micro-fabrication as a new technology over a decade ago, a large variety of micro-objects including 2D and 3D micro-optical components, micromechanical devices, and 3D photonic crystals have been fabricated. Recent efforts have been made to improve the function of micro-objects obtained with LMF; in particular, many studies have been carried out with the aim of developing functional the microstructures relying on the material. In this thesis, efforts to develop the effective synthesize of the functional nano-composites which could be applied to LMF and also describe attempts to fabricate the various the microstructures with the functional nano-composites and improve the performance of the micro-structures based on the nano-composites were discussed. The major content of the thesis as follows:1. The literatures review was covered. The purpose, the significance and the methods of research in the paper were addressed.2. The synthetic methods of polymer nano-composites which were suitable for the laser micro-fabrication were reviewed. Especially, the preparation theory and process of semiconductor nano-particles in the polymer with in-situ synthetic methods by photo-polymerization were discussed in detail. The content offers the basic investigation methodology and research direction of the nano-composites 3. The nanocomposites with the in-situ synthesis methods were prepared; the polymeric rate of the photo resists and the influence factor on the synthesis of CdS were involved in the thesis. In addition, the content, structure, particle sizes and morphology of CdS nano-particles in polymer were characterized by XRD, TEM, Tg-DTA. The experimental results not only exhibited that the in-situ synthesis methods could successfully prepare CdS nano-composites with the photo-polymerization, but furnished the synthesis methods of the nano-composites which were applied to LMF for the future of work.4. The size control of CdS nano-particles in the nano-composites, especially the principle and methods for tuning CdS nano-particles sizes by the Cd2+ number controlling in the polymer network and micelle were discussed. It adjusted the content of the crosslinker and the concentration of Cd(MA)2 in the photo resists to fabricate CdS nano-composites with CdS particles size in the range of 2~8nm, which clearly showed photoluminescence properties and achieve the wavelength tuning of the photoluminescence in a range of 450~500nm, owing to the quantum size effect of CdS nano-particles in the material.5. LMF with the nano-composites and the property of the microstructures were investigated. The process condition and property of the diverse styles microstructures by the four beams interference of single photon were investigated. Secondly, for applying CdS nano-composites to LMF, The various three dimension microstructures such as micro-hand which showed the optical property were fabricated. Finally, the photonic crystals were manufactured using two-photon laser precision micro-fabrication. Here the influence of the materials and lattice constant on the properties of photonic bandgaps were discussedThe synthesis method the nano-composites mentioned combined with the photo-polymerization, in the thesis contributed to make the laser micro-fabrication quite compelling for the micro-structures and micro-devices application.