| The non-conductive material obtain a period of rapidly development in modern industry,due to excellently properties of high tenacity,easily machined,low price.But as a property of insulation,on some level,the application of non-conductive material is limited.To get the ability of metallic materials,the non-conductive substrate is often metallized through electroless plating method.Prior to the electroless plating,the substrate surfaces need to be firstly Pd activation pre-treated.The effect of Pd activation is a key role of electroless plating.The bottleneck problem of this technology is the preparation of the Pd colloid solution with high concentration and excellent catalytic activity.In this study,it is aimed to develop a preparation method of the Pd colloid with high concentration and high quality.Pd colloid was prepared by a continuous reduction reaction with minor content,this paper carried out the following research works:(1)The morphology,microstructure,and composition of the Pd colloid were characterized by Scanning Electron Microscope(SEM),Transmission Electron Microscope(TEM),X-Ray Diffractomer(XRD)and X-ray photoelectron spectroscopy(XPS),respectively.The activate ability of this Pd colloid was examined by electroless Cu and electrochemical test.It was found that the average diameter of the Pd particles was less than 4 nm.Even if the concentration of Pd was less than 25 mg/L,this Pd colloid still had good activation ability for electroless.(2)The study result demonstrated that the shell structure of the Pd micelle played a key role for the activation ability.The shell of Pd micelle was consisted of Sn2+,Sn4+ and Cl-,and generally formed two structures,[PdSn2]Cl6 and[PdSn3]Cl8.For the structure of[PdSn3]C18,the failure of the hydrolysis could lead to the loss of activation.The preparation method in this work can effectively avoid the occurrence of[PdSn3]Cl8,which greatly improved the activation ability of the Pd colloid.This method could greatly improve the utilization and reduce the waste of precious metal Pd.(3)Although the technology of Pd colloid has gained widely used in electroless industry,the process is complexed,polluted,and expensive.To cate the slogan of green production,the non-conductive material has studied to get ability of material in other ways.In this study,we explored a new method of metallized which named black hole.It is a kind of direct plating method.In this work,we prepare four kinds solution of black hole.The morphology,microstructure,and composition of the black hole solution were characterized by SEM,TEM,UV,respectively.The conduction ability of black hole solutions was examined by DTV directed plating test.(4)It was found that adsorbed surfactant cannot adequately disperse carbon black in black hole solution.And as the existence of desorption,the solution's stability is feeble;destroyed structure of carbon black could add the kinds and qualities of functional group by oxidation and graft.Those methods could effectively and permanently disperse carbon black particles.The result of DTV directed plating test indicates that the conduction ability of those black hole solutions was excellently.In this study,we proposed a method that carbon black was need oxidized,grafted before dispersed.In this black hole solution,the carbon black was adequately dispersed,and has a good stability.The result of DTV directed plating test indicates that eight holes were conducted in high current density area,and 5.5 holes were conducted in low current density area.According to standard,this result achieved excellent level.As greatly reduced pollution and cost,this method will possess widely foreground and application space. |
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