Study On The Structure Modulation Of PAAO Template And The Preparation Of Functional PAAO/Ni

Compared with bulk materials,nanostructured materials have unique structures and novel functional properties,so they have a wide range of applications in the fields of electricity,magnetism,optics,and biology.Porous anodic aluminum oxide(PAAO)film is a kind of ordered porous material,and has many advantages such as controllable structure,good repeatability,low cost,mature technology,etc.It is often used as template to prepare nanostructural materials.In this paper,the structure modulation of PAAO film was studied in the oxalic acid electrolyte system and the functional PAAO/Ni nanostructural material was prepared based on the method of oxalic acid PAAO template-assisted electrochemical deposition.(1)PAAO template with a wide range of adjustable interpore distance(D_int)between 102nm and 525 nm was obtained,by changing the anodic oxidation voltage(40?260 V),electrolyte temperature(-20?5°C),and the ratio of 0.3 M oxalic acid to ethanol(1:0,4:1,2:1,1:1,v/v).The mechanism of transition of soft and hard anodization was discussed.In addition,the pore widening process of the PAAO template obtained by applying a voltage of 40 V in a0.3 M oxalic acid electrolyte at 5°C was studied.(2)Micro/nano porous templates with novel hierarchical structure have been fabricated by anodization on patterned aluminum surface.Firstly,a layer of nail gel(CA600)is applied to the surface of the electropolished aluminum sheet by spin coating.After a drying process,interconnected microscale cracks can be formed on the surface of the aluminum sheets(i.e.,patterned aluminum surface).Then,using the patterned aluminum sheet treated with CA600in a 0.3 M oxalic acid solution at 15°C,a micro/nano porous template with a unique hierarchical structure was prepared at a voltage of 30?50 V.The effect of spinning rate,spinning time,and anodization voltage on the microstructure of the porous templates has been studied in detail.The porous templates can be used to prepare various hierarchical functional materials.(3)The through-hole process of the PAAO template was studied,and Ag NF(Nanofilm)was sputtered on the through-hole PAAO template as an electrode,and the Ag NF/PAAO structure was obtained.Using Ag NF/PAAO assisted electrochemical deposition to prepare Ni nano-arrays with high filling rate and uniform length.The Ag NF/PAAO/Ni structure was obtained,and the PAAO templates with different pore sizes and the influence of deposition time on the size of the Ni nanoarray were analyzed.(4)The surface plasmon properties of Ag NF/PAAO and Ag NF/PAAO/Ni structures are studied.and the surface plasmon properties of Ag NF/PAAO and Ag NF/PAAO/Ni structures can be modulated by changing the thickness of Ag films and the size of Ni nanoarrays.