Preparation Of Zinc Oxide Micron And Its Infrared Absorption And Photocatalytic Properties

Since the 21st century,the generation and development of new micro-nano materials have greatly promoted the progress of human society.Among them,zinc oxide has attracted much attention with its many advantages.ZnO micro-nano structural material,but also shows a lot of special properties,such as piezoelectric,mobility,fluorescence,Uv and infrared absorption and scattering capacity,etc.,using its good characteristics in optical,electrical,magnetic,can produce different functional materials,such as the function of zinc oxide film,pressure sensitive materials,its application field widely.And the semiconductor ZnO caused greatly interested in the scientific community,partly because it has a great excitons can combine(60 meV),it may make zinc oxide even at room temperature is the result of the reorganization of exciton excited state.In addition,ZnO is a kind of broadband gap(3.37eV)composite semiconductor,which is suitable for short wavelength photoelectric applications.To sum up,ZnO semiconductor micro-nano materials have a wide application in the field of absorbing materials and photocatalysis.In particular,in recent years,with the development of world industry and society,the emission of large quantities of carbon dioxide has caused the global greenhouse effect to become heavier and heavier.Carbon dioxide emission reduction and conversion has become a hot topic in the scientific community.Among them,it is important to find suitable photocatalyst to convert carbon dioxide into high-energy density fuel such as carbon monoxide and methane by photocatalysis.Zinc oxide semiconductor photocatalyst is also naturally attracting attention.This article developed a very simple experimental project of ZnO morphology and structure of the design and preparation of zinc oxide microns star micro-composite structure,explores the controllable growth conditions,and focuses on its infrared absorption performance and the efficiency of photocatalytic reduction of carbon dioxide to carbon monoxide,specific content is as follows:In the first chapter,first of all to a brief introduction of metamaterials,to zinc oxide semiconductor materials were introduced,and emphatically introduces several kinds of synthesis methods of ZnO micro-nano semiconductor materials,sol-gel method,hydrothermal method and microwave heating method;Secondly,the photocatalysis was introduced,the semiconductor photocatalyst was emphatically introduced,and the photocatalytic reduction properties of carbon dioxide based on semiconductor photocatalyst were summarized.In the second chapter,a simple hydrothermal method was used to design a nano-nanocomposite structure with a specific surface area of 7.9801 m squared/g.This method has the advantages of less reactant,mild synthesis condition and short reaction period in the same synthetic zinc oxide micro-nano structure.After synthesized ZnO micro star structure,and the reaction conditions such as dilution ratio,reaction time,reaction temperature,etc on the zinc oxide has carried on the detailed study of the influence of growth morphology,found the ZnO micro star micro-controllable preparation of nano composite structure optimum reaction conditions.In the third chapter,the absorption properties of the prepared zinc oxide micron star micro-nano composite structure in infrared band were studied.First using FDTD software on ZnO micro star structure modeling,then under the condition of the boundary conditions for PML,for single and single ZnO micro star structure software simulation of the absorption of infrared wavelengths.In the near-infrared band of 900-2000 nm,less than 3%reflectance was achieved.Using Uv-vis-near infrared spectrophotometer of the infrared absorption of samples test,by comparison with the results,the theoretical simulation and experimental.In chapter 4,a photocatalyst was designed.In the synthesis of ZnO micro star micro-nano composite structure by silver nitrate ultraviolet light reduction reaction growth on the surface attached to the silver nanoparticles,and tested the efficiency of photocatalytic reduction of carbon dioxide to carbon monoxide,the experimental results show that the configuration of the ZnO micro star again after adhesion on the silver nanoparticles,makes the efficiency of photocatalytic reduction of CO2 for CO from commercial ZnO powder 2.29μmolg-1h-1 increased to 9.21μmolg-1h-1,increased by 4 times.The analysis shows that this is a result of the surface plasmon absorption enhancement effect of silver particles and the increase of ZnO surface charge transport active surface of silver particles.This undoubtedly provides a broader space for the application of ZnO in the field of photocatalysis.In the fifth chapter,we reviewed and summarized the whole paper,meanwhile the potential prospect was illustrated as well.