Preparation And Properties Of Antioxidant Silver Electronic Paste

Electronic pastes,as a multidisciplinary technology product,have been widely used in microelectronics fields and play an irreplaceable role in the development of ultra-large-scale integration,lightweight and miniaturization of microelectronic devices.Currently,there are varieties of electronic pastes used to manufacture components working under normal temperature and humidity,and the synthesis processing of electronic pastes is also quite mature.However,most devices made of electronic pastes cannot work stably in environments such as high temperature,high humidity and strong corrosion,and the resistance of printed conductor is greatly affected by the environment.Furthermore,few studies have been reported on electronic pastes suitable for strong oxidizing environments.Therefore,acquiring anti-oxidation electronic pastes can expand their application range in extreme working environments.Besides,as an emerging additive manufacturing process,direct-write printing has attracted wide attention due to its high accuracy,controllable process,and high utilization rate of raw materials.Combining with the emerging additive manufacturing process of direct-write printing can expected to provide new solutions for the rapid manufacturing of electronic devices.Herein,we developed a kind of anti-oxidation silver paste by the mask printing method,and the electronic paste based on micron silver powders has excellent storage stability,rheology and printability.The square resistance of the conductive film prepared by this paste is about 0.012?/sq,which is only two orders of magnitude higher than the bulk silver film with the same thickness.The conductive film owns a good mechanical strength(the adhesion of the substrate is0.49 N/mm²),and shows well oxidation resistance that has a low resistance change rate in high temperature,high humidity and strong oxidation environment.Then we prepared printed the Joule heaters which can work stably at high temperature.Then an anti-oxidative electronic paste was obtained based on chemically synthesized silver nanoparticles and silica nanoparticles,which is easy to direct-write print.The resistivity of high conductive conductors after being sinted by semiconductor laser with a wavelength of 808 nm is1.43×10^-6?·m,which is only two orders of magnitude higher than the bulk silver.The mechanism of laser sintering was explained by building the model of nanoparticles and simulating:the plasmons between nanoparticles are excited by laser,which induce the sintering of nanoparticles.Characterization of scanning electron microscope(SEM)on the cross-section of the conductors yielded results that the laser had an efficient sintering effect on the nanoparticles inside the conductors.