Preparation And Research Of Single-layer Densely-packed Noble Metallic Nanoparticle Hole Arrays

In recent decades,the preparation technology of subwavelength size noble metal nanoparticles has developed rapidly.The surface plasiton resonance energy generated by noble metal nanoparticles limits the incident electromagnetic wave to the surface of the particles,forms a huge local field enhancement,breaks through the optical diffraction limit,and has a very high regulation.Therefore,noble metal nanoparticles have great application value in biosensors,metamaterials,nonlinear effects and other highly integrated optoelectronic devices.And precious metal nanoparticles based two-dimensional line array structure has higher local field enhancement,regulation,integration,miniaturization and so on characteristics,can improve the performance of traditional sensors and photoelectric device to promote integration and miniaturization of the device,such as Raman detection sensors,solar cells and optical storage devices,etc,to become one of research hotspots in the field of micro-nano photoelectron.As for the structure of noble metal nanoparticle pore array,its unique optical abnormal transmission phenomenon has aroused the researchers' extensive research interest.At present,regular hole array structures can be obtained by using top-down physical etching method,but the cost is high and it is not convenient to regulate.There are also bottom-up embedded self-assembly methods to prepare nanoparticle hole array structure.However,the existing self-assembly techniques have high requirements for nanoparticle size,material and hole size,and low regulation.In this paper,a self-assembly method for the preparation of a single layer of densely arranged noble metal nanoparticle pore array structure was proposed.This self-assembly method is different from the previously reported self-assembly of block polymers.A new preparation method based on the pore array structure of precious metal nanoparticles was developed.The method is suitable for gold nanospheres,gold nancubes,gold nanorods and other particles,and is suitable for precious metal nanoparticles with different morphologies.In this method,the pore size can be controlled in the range of 1-10 ?m by adjusting the concentration of noble metal nanoparticles and the concentration of bovine serum protein.The prepared array structure can be easily transferred to different substrates.In addition,compared with the traditional physical etching method to prepare the array structure,this method solves the problems of high preparation cost and cumbersome processing steps.The pore array structure of noble metal nanoparticles prepared by this method lays a foundation for the design and implementation of related micro/nano optoelectronic devices.The specific work of this paper is as follows:(1)Gold nanoparticles and gold nanoparticles were prepared by seed growth method.By adjusting the concentration of gold nanoparticles seeds,the amount of auric chloride and the amount of ascorbic acid,the preparation of different sizes of gold nanoparticles was realized,and a wide range of local resonance peak location was realized.Through the strict control of the conditions in the preparation process,the size distribution range of the two kinds of gold nanoparticles is narrow and the shape is regular.It lays a foundation for the next step of self-assembly process.(2)Four kinds of precious metal nanoparticle systems were prepared by self-assembly method,which are the single-layer nanoparticle thin film structure and pore array structure,and the single-layer nanoparticle thin film structure and pore array structure of single-layer nanoparticle cube.The four structures were characterized,and the results showed that in a large area,the particles of the monolayer densely arranged gold nanoparticle pore array structure were neatly arranged,the pore size was relatively uniform,and the thickness was uniform.(3)The influencing factors of the pore array structure of monolayer densely arranged gold nanoparticles were investigated.The experimental results showed that the pore structure was the most uniform when the BSA solution concentration was between 0.1-1% W/T for gold nanoparticles and gold cubic nanoparticles.The tuning of hole size in the range of 1-10?m can be achieved by changing the concentration of gold nanoparticles.