The Study Of Femtosecond Laser Ablation And Electrochemical Deposition On Metal Surface Through Mask Effect

Infiltration characteristic is a very important property of solid material surface.A large number of theoretical and experimental studies show that it mainly depends on the microstructure,the chemical composition and properties of the material surface.In recent years,especially the super hydrophobic surface has played an important role in the field of basic research,practical application and bionic technology,infiltration characteristics has attracted wide attention of domestic and international research.Although a large number of researchers have fabricated a variety micro-nano structure with super hydrophobic property,most of them exhibited defects,such as irregular structure,poor repeatability and so on,and part of the methods are very complicated and with low efficiency.Hence,the processing of femtosecond laser fabrication depends on the interaction between photons and electrons.As the shortest pulse laser,femtosecond laser has the characteristics of high precision,less crack and less heat affected zone,which makes it possible to fabricate surface with ordered micro-nano structure.Electrochemistry as a link between electron and atom,has a natural advantage in micro-nano fabrication.By combining the advantages of femtosecond laser and electrochemistry in micro-nano fabrication,this paper aims to prepare the super hydrophobic surface with a consistent and stable micro-nano structure.The main research and results in this paper are summarized as follows:(1)Processing parameters(pulse number,energy density,polarization direction)of the femtosecond laser ablation on copper are studied,which was used to discover the laws of femtosecond laser ablation on copper and achieve precise control of size and morphology.Study found that the transition of nano structure to micro-nano structure can be realized by changing the pulse number or the energy density,and during electrodeposition experiment,this structure is conducive to enhancing the role of the substrate and the micro-mastoid bite,thereby enhancing the stability of the structure.Principal axis of ellipse in ablation zone always parallel to the polarization direction of the laser;studied the correlation between the processing parameters and diameter or depth of ablation zone.Finally,in order to exclude the coating may have an impact on the structure,we count the size of femtosecond laser ablation crater on copper with the mask.The main methods of characterization used in the experiment are SEM and AFM.(2)A micro / nano array structure was designed,which was formed by two steps of redox reaction on the surface of copper metal.The experimental procedures are described in detail: coating,film ablation by laser,micro structure growth by electrochemistry,nano structure growth by reduction of silver,silane modification.The effects of femtosecond laser processing and electrochemical parameters on the morphology of the micro structure were studied,and the evolution of silver nano dendritic structure with the replacement reaction time was studied.Finally,the effects of several key steps in the experiment were compared and studied.