Fabrication Of Au Nanostructure Arrays By Growth Method And Its Optical Properties

Based on the unique surface plasomon resonance(SPR),noble metal micro-nanostructures have shown great application prospects,such as sensing,color display,surface-enhanced spectroscopy substrate,photoelectric devices and so on.SPR is defined as a wonderful optical phenomenon that the collective oscillations of free electrons and the accompanying enhanced electromagnetic in the metal surface because of the interaction between metal micro-nanostructures and incident light at specific wavelength.It has been considered that the SPR strongly dependent on the size,shape,composition,and the surrounding dielectric environment of the metal micro-nanostructures.With the development of the micro-nano fabrication technology,a great deal of metal micro-nanostructures with diverse morphologies have been prepared.However,in order to enrich people's living and industry more conveniently,the micro-nano fabrication technology that cheaper,more simple and suitable for large-scale commercialization has been attached lots of interest.In this paper,based on the growth of patterned Au NPs arrays,we constructed many kinds of Au nanostructure arrays,explored the optical properties and corresponding application.In chapter 2,we presented a new strategy of fabricating ordered Au nanohole arrays combined colloidal self-assembled with electrostatic assembly technique.Through the change of the optical properties from patterned Au NPs arrays to ordered Au nanohole arrays,the growth mechanism has been discussed.The nanohole thickness and diameter could be mono-regulated by annealing PS spheres and varying the diameter of PS spheres respectively.The thermal treatment can effectively improve the surface roughness of the ordered Au nanohole arrays based on growth method,improved average surface roughness under 5 nm.This method is simple,cost-effective,and involves no complex instruments,which applicable to ordinary laboratory and mass production.The method is also applicable to fabricate other metal nanohole arrays,which has exhibited great potential in diverse applications,such as sensing,filter,surface-enhanced spectroscopy substrate,and so on.In chapter 3,firstly,we constructed kinds of unordered Au nanostructure arrays used PS spheres as mask by electrostatic adsorption via physical vapor deposition,such as Au nanodisk,nanoring,eccentric nanoring,and crescent nanostructures.The size and shape of these kind of nanostructure arrays can be controlled by varying the annealing time and diameter of PS spheres,the angle of physical vapor deposition.On this basis,we constructed the ordered Au nanoring arrays via colloidal lithography.The inner and outer diameter could be tuned by by varying the etching time and the annealing time of PS spheres.The method is cost-effective and versatile,which could be used to construct kings of discrete metal nanostructures that exhibited great potential in diverse applications,such as magnetic storage,metamaterial,surface-enhanced spectroscopy substrate and so forth.