Preparation And Application Of Two-dimensional Periodic Microstructures Based On Colloidal Crystals

Colloid particles have been widely concerned in various research fields because of their high symmetry in crystallization.Two-dimensional crystal,usually called a single layer colloidal crystal,is a single layer of six angle arrays of colloidal particles.Monolayer colloidal crystals are widely used in flat panel printing and lithography as two dimensional templates,and metal nanostructures are prepared in a low-cost and high-quality way.However,the traditional preparation method of two-dimensional colloidal crystal template based on template method has many problems,such as cumbersome preparation process,long cycle time and low success rate.It also brings inconvenience to the preparation and application of two-dimensional periodic microstructure.The subject "Preparation and application of two-dimensional periodic microstructures based on colloidal crystals" in response to the above problems,theoretical analysis and experimental studies were carried out based on the self-assembly process and principle of nano-particles.By means of spin-coating and gas-liquid surface microfluidic assembly technology to complete a large-scale long-range orderly two-dimensional colloidal crystal film preparation,and as a template,combined with other physical processes,the result of the preparation of two-dimensional periodic micro-nano structure and its application was completed.This article mainly completed the following work:1.The monolayer of colloidal microspheres was prepared by the method of spin-coating and microfluid injection on the gas-liquid surface.Based on the theory and experiment of the spin-coating method and the traditional two-dimensional colloidal crystal film preparation method,the experiments were repeatedly repeated and the results were compared to improve the experimental parameters of the colloidal suspension and the concentration ratio of the colloidal microspheres suspension.In addition,a new method for preparing monolayer films was proposed in this paper,the microfluidic injection method was used to obtain a large area hexagonal close-packed periodic nanosphere Arrays,transfering the film to the target substrate or fiber as the transportability of the monolayer film.Finally,the advantages and disadvantages of the two methods were compared and analyzed.The morphology of the samples was observed by optical microscope and scanning electron microscope.The spectral characteristics of the samples were compared with the ocean spectrometer and the analysis software FDTD Solutions.2.Two-dimensional colloidal crystal template prepared by microfluid injection method,combined with reactive ion etching and vacuum magnetron sputtering technology,completed the geometric parameters of the controllable two-dimensional metal spherical shell array structure preparation.The crystal morphology and spectral characteristics of the samples were observed.The influencing factors of the structure were discussed and the optimal experimental parameters were determined.The sensitivity of the array structure to the surrounding environmental factors is applied to refractive index sensing.The refractive index sensitivity and quality factor are calculated,and the sensing performance is favorable.