Preparation And Properties Of Particle-free Conductive Ink Based On Copper Acetate

With the rapid development of the printed electronics,it has become a kind of revolutionary and advanced manufacturing technology in the field of microelectronics,which has aroused widespread concern in the related industries of the global electronics industries,manufacturing industries and so on.Electronic devices toward the direction of high-quality and low-cost,at the same time the demand are increasingly in productions process and printing materials.Conductive ink will become the core material studied by researchers owning to the characteristics of conductivity ability and wide range of applications.Among which,the metal-based conductive ink not only owning to the characteristics of the conductivity ability,but also printed the electronic circuits and patterns by printing,such as RFID,flexible display,sensor,and so on.The precious metals gold and silver,as the precursor in the conductive cooper ink,could not be widely used owing to high prices.However,the cooper got widespread concern due to high conductivity and other advantages.Based on the above reasons,this paper has prepared the high conductive ability of the acetate cooper ink by optimizing the formulation of the ink,realizing the purpose of low sintering temperature.At the same time,the conductivity of the sintered coating was also investigated by the effects of copper amine ratios,copper acid ratios and solvents ratios.And the conductivity ability of the sintered coating conditions was discussed as well.Firstly,taking the copper acetate as the precursor,the particle-free conductive ink based on copper acetate was prepared by optimizing the complexing agent and alcohol solvents.Taking organic amines as complexing agent,such as,AMP isopropanolamine,1,2-Diaminopropane,N,N-dimethylethanolamine,octylamineand,and analyze the thermal stability of the formed complex.The results showed that the ligands an reduce the thermal decomposition temperature of copper acetate to some extent,and when the AMP as the complexing agent,the resistivity of the conductive coating was 8.5 ??·m;At the same time,adjusting the surface tension and viscosity of the conductive cooper ink,a good stability of the particle-free conductive ink was got by taking formic acid as a reducing agent and changing the type of the alcohol solvents etc.The resistivity of the sintered coating was 3.4 ??·m when the glycerol and n-propanol were as the mixed solvents.Secondly,based on the previous research,particle-free conductive ink based on copper was prepared by using AMP as the complexing agent,glycerol and n-propanol as the mixed alcohol solvents.The conductivity ability of the ink was studied by studying the effects of copper amine ratios,copper acid ratios and solvents ratios.The resistive of the coating was sintered by the conductive ink was 3.4 ??·m when the molar ratio of the copper,amine and acid was 1: 2.5: 4,the volume ratio of solvents v(glycerol): v(n-propanol): v(water)was 3: 3: 2.Finally,the effects of the sintering temperature and time of the sintered coatings of the best formula ink on the conductivity ability was studied.It was shown that the sintered coating has a high resistivity when the sintering temperature was low,and the resistivity was as low as 3.4 ??·m when the sintering temperature reaches 180 ?.With the sintering temperature continues to rise,the resistivity of the sintered coating tends to rise;The conductivity of sintered coatings sintered at 180 ? showed a tendency to increase first and then decrease with the increase of sintering time,and the resistivity was 3.4 ??·m when the sintering time was 0.5 h.And the sintered coating of the uniform,compact and the low resistivity(4.4 ??·m)could be obtained by sintering in the 120 ? air atmosphere furnace without passing through the reducing gas,Realizing the initial goal of the particle-free conductive ink in the air atmosphere of low-temperature sintering.