Imaging And Surface-Enhanced Raman Scattering Based On Metal Micro-Nano Structure

With the development of science and technology,scholars’ research has entered the micro-level or even nanoscale on materials,especially metal nanomaterials,the research of these metal nanomaterials has pushed technology to the forefront.Research and development of these metal nanomaterials have pushed technology to the forefront.Metal nanomaterials have the unique characteristics that traditional materials do not possess.They mainly exhibit three major characteristics: surface effect,small size effect,and macroscopic quantum tunneling effect.These characteristics provide great application space for the research direction of metal materials and the development of science and technology.Therefore,most of the new scientific technologies related to bioimaging,surface-enhanced Raman scattering(SERS),biomedicine,sensors,and detectors currently use metal nanomaterials.In the field of bioimaging,metal nanoparticles exhibit stability,strong light signal,and biocompatibility,which are unmatched by other materials.It is mainly used in dark field imaging,Raman imaging,fluorescence imaging and so on.In the dark field imaging,the introduction of gold nanoparticles makes the sensitivity of dark field imaging breakthrough the sensitivity of traditional imaging,and improve the accuracy of imaging equipment In surface-enhanced Raman scattering,the structure,size,and material of the substrate determine the SERS enhancement effect,and the application of the metal nanoparticle can improve the weak signal of the molecule to be measured and solve the problem of low sensitivity of the SERS spectrum.This application has important implications and made great progress for medical detection,environmental monitoring,and food safety.This article mainly discusses the potential fingerprint imaging of metal nanoparticles,and analyzes the main factors affecting the discrimination and clarity of fingerprint imaging.The main influencing factors of SERS enhancement in quasi-periodic structures(sandpaper)and periodic structures containing metal nanomaterials were studied,as well as theoretical simulations and analysis of the influence of periodic structure on SERS enhancement.The first chapter mainly introduces theapplication background of metal nanoparticles and the current research hotspots and applications of metal nanoparticles.The second chapter mainly introduces the fingerprint imaging based on gold nanoparticles,and discusses the factors affecting the quality of fingerprint imaging:(a)Gold nanossoles were prepared by silver nitrate and sodium citrate,and the particle size and particle size uniformity of the synthesized gold nanoparticles were characterized;(b)The influence of diameter and particle size uniformity on the clarity of imaging fingerprints;(c)Explore the effect of gold nanofilm thickness on fingerprint imaging clarity.The third chapter mainly introduces the SERS enhancement of the surface of quasi-periodic structures(the sandpaper)carrying silver nanoparticles,and explores the factors that affect the SERS enhancement:(a)Explore the dark field imaging of quasi-periodic structures of different sizes and analyze the effect of surface structure,surface depth,and surface uniformity on SERS enhancement;(b)Examining the effects of different quasi-periodic structures on SERS enhancement at the same concentration;(c)When investigating the same quasi-periodic structure,the effect of probe molecule concentration on SERS enhancement.The fourth chapter of the paper discusses the influence of periodic structure on the SERS enhancement from the experimental study:(a)Laser interference induced periodic structure diagram;(b)The effects of two laser beams and three laser light interference-induced nano-periodic structures on SERS enhancement;(c)Under the three-dimensional periodic structure,the influence of probe molecular concentration on SERS enhancement was studied.The fifth chapter of the paper theoretically studies the electromagnetic field enhancement and SERS enhancement of the periodic structure,the structure was designed to study the effects of lattice period and nanorod length on the electromagnetic field enhancement and further analyze the SERS enhancement.The last is a summary of the full text.