Study On Plasmon Regulation And Photoelectric Effect Based On Hetero-nanostructures

In recent decades,the development of artificial micro-structure materials is very rapid,especially the wide demand of high-performance optoelectronic devices has promoted the research and exploration of hetero-nanostructures materials.A great deal of achievements in the design,preparation,characterization and application of micro-structure materials have been made.The structure and function oriented artificial micro-structure materials have become the research frontier in physics,chemistry and many interdisciplinary fields.Based on the artificial hetero-nanostructures materials,this article discusses the following two aspects:firstly,the excitation and coupling effects of plasmons on the surface of metal micro-structure are studied,especially the experimental and theoretical studies on the regulation of gold?Au?plasmons by the thermally phase transition material vanadium dioxide?VO₂?;secondly,An artificial optical micro-structure based on graphene-COFs hetero-nanostructures was designed and fabricated.The photoelectric effect of the structure was studied and its application in ultra-high sensitive high-speed photoelectric conversion was explored.This paper mainly discusses according to the following structure:In the first chapter,firstly,the development history of micro-structure processing technology is briefly introduced,including physical and chemical methods to achieve micro-structure processing;secondly,with the help of various micro-structure processing technology,people have successfully prepared micro-structure processing material system with excellent photoelectric properties,including micro-structure processing material system,two-dimensional material?mainly graphene?system,porous material system,etc.In order to improve the performance of optoelectronic devices,several materials are combined to form hetero-nanostructures.Therefore,it is necessary to further study and explore the micro-structure processing structure.In the second chapter,we focus on the dynamic control of the plasmon of gold by the thermally induced phase transition material Vanadium dioxide.It mainly includes the following aspects.Firstly,monodisperse is prepared on quartz substrate by hydrothermal synthesis Vanadium dioxide nano-spheres are coated with a certain thickness of gold layer by electron beam evaporation technology to form a composite nanostructure with a"dielectric core metal hemispherical shell"hetero-nanostructures.Secondly,the light scattering properties of the composite dielectric metal hetero-nanostructures are calculated by numerical simulation,and its plasmon resonance characteristics are studied,The optical properties were tuned from the two dimensions of particle size and gold film thickness,and the control of these two parameters on the plasmon resonance effect of the new composite nano-materials was studied systematically.Then,the radius of Vanadium dioxide particles was 250 nanometer,and the thickness of gold was 15 nanometer,the light scattering characteristics of nano-particles were measured by using the micro dark field optical system.Especially,through the construction of the micro-zone dark field optical system with variable temperature?range 25-90 centigrade?,we studied the response of the optical effect of the new composite nano-materials with the change of temperature,and found the Vanadium dioxide thermally induced phase transition?near 68 centigrade?significant dynamic regulation effect on the characteristics of system plasmon.In Chapter 3,the optical properties of Graphene-COFs hetero-nanostructures and its application in photoelectric conversion are studied.The main contents are as follows:firstly,considering the high electronic mobility and optical transparency of graphene,a photosensitive 2D Graphene-COFs with highly ordered donor acceptor topology was synthesized in situ on graphene by selecting tetraphenylethylene monomer with photoelectric activity.Then,we systematically studied the excellent photoelectric response characteristics of the Graphene-COFs hetero-nanostructures,and found that the optical response rate is 3.7×10⁷(2^-1 and the time response is 1.14ms in 473nm.Finally,based on the high specific surface area of COFs and the polarity selectivity of gas,we explored the application of this composite nano-material system in the high sensitive gas sensing,and explored the reversible adjustment of the sensitivity of photodetectors through specific gas target molecules.This study provides a new strategy for the construction of advanced photoelectric functional devices with programmable material structure and various adjustment modes,and a new idea for the design and preparation of high-performance photoelectric detection devices.We summarize the whole thesis,and look forward to the exploration of the large- scale application of metal micro-structure and two-dimensional porous material structure in optoelectronic devices in the future.