The poly(epoxy-N-methylaniline)conductive organic carrier was used as the bonding phase of the low-temperature conductive silver paste.Then,this was mixed with different proportions of silver powder to prepare the low...The poly(epoxy-N-methylaniline)conductive organic carrier was used as the bonding phase of the low-temperature conductive silver paste.Then,this was mixed with different proportions of silver powder to prepare the low-temperature conductive silver paste.Afterwards,the effect of the conductive organic carrier on the properties of the low-temperature conductive silver paste was determined by IR,DMA and SEM.The results revealed that the prepared conductive paste has good conductivity,film-forming performance,printing performance,low-temperature curing performance,and anti-aging performance.When the mass percentage of the bonding phase/conductive phase was 40/60,the lowest volume resistivity of the conductive silver paste was 4.9×10^(−6)Ω⋅cm,and the conductivity was the best.展开更多
Electronic 3D printing possesses a remarkable molding ability and convenience in integrated circuits,flexible wearables,and individual automobile requirements.However,traditional 3D printing technology still struggles...Electronic 3D printing possesses a remarkable molding ability and convenience in integrated circuits,flexible wearables,and individual automobile requirements.However,traditional 3D printing technology still struggles to meet the demands of high precision and high efficiency in the process of fabricating a curved surface circuit,particularly achieving precise silver circuit molding on irregular substrates.Here,a high-precision and muti-scaled conformal manufacturing method for silver circuits is presented through the digital light processing(DLP)of ultraviolet-curable silver paste(UV-SP)with adjustable photocuring properties,enabling the successful preparation of micro-scaled conductive structure on the sharply skewed hook face.The minimum modeling depth and width of the cured silver paste can be well controlled to 10 and 88µm,respectively.Compared with traditional printing technology,the printing efficiency of complex patterns has increased by over 70%.The printed silver circuit demonstrates an exceptionally high electrical conductivity,reaching as high as 1.16×10^(7) S/m.Additionally,the UV-SP exhibits significant manufacturing efficiency and superior molding resolution compared to conventional direct ink writing and inkjet printing techniques,thereby contributing to the attainment of high precision and efficiency of conformal and micro-molding manufacturing in sensors,communication antennas,and other electronic devices based on curved substrates.展开更多
The traditional hermetic packaging methods,which require high temperatures and high voltages,would have adverse effects on electronics devices.Based on current-assisted sintering technology,we proposed a new hermetic ...The traditional hermetic packaging methods,which require high temperatures and high voltages,would have adverse effects on electronics devices.Based on current-assisted sintering technology,we proposed a new hermetic packaging method using silver paste.Comparing the microstructure of the joints sintered with different currents,we found that with the increasing sintering current from 4.7 kA to 5.3 kA,the density of the joint increases,which improves the hermeticity and bonding strength of the joints.The results of thermal cycling tests showed that the sealing joints sintered at 4.7 kA with larger porosity are more prone to fail because pores tend to be sources of defects under thermal cycling.After 250 ℃ high thermal storage,there is the coarsening of the pores and the delamination near the Ag/Au interface,degrading the sealing performance of the sintered joint.Besides,the sealing joints sintered at 5.3 kA exhibit superior reliability when exposed to high temperatures.展开更多
Strain sensors for human-motion detection must offer high stretchability, high sensitivity, fast response, and high recovery speed. In this study, we choose silver paste as a sensing material and use a screen printing...Strain sensors for human-motion detection must offer high stretchability, high sensitivity, fast response, and high recovery speed. In this study, we choose silver paste as a sensing material and use a screen printing method to fabricate the strain sensor based upon an electrical-resistance mechanism. After curing elastomeric polyurethane film with a thickness of 150 μm on PET film, the polyester resin mixed with blocked isocyanate curing agent was coated as a masking layer to reduce the film’s stickiness. The effect of the polyester masking layer upon the silver paste screen printing process was examined using a rolling-ball-tack test, TGA analysis of polyester resins, and cured silver-electrode films. The cost-effective strain sensor fabricated by using silver paste and screen printing processes on the stretchable-polyurethane-substrate film showed high sensitivity and fast response in a strain range of up to 100%.展开更多
In the present study,we investigate several textile coating pastes used in the market based on their radiation protection capability for gamma rays.The gamma ray mass absorption coefficients of some coating pastes dop...In the present study,we investigate several textile coating pastes used in the market based on their radiation protection capability for gamma rays.The gamma ray mass absorption coefficients of some coating pastes doped with antimony,boron and silver elements have been investigated.It has been determined that the gamma ray mass attenuation coefficient decreases rapidly as the energy of the gamma rays increases.It was determined that the doping of the main printing paste with silver and antimony considerably increased the gamma ray absorption capability of main paste.However,the doping of the paste with boron reduces the mass absorption of gamma rays.In particular,the gamma ray mass absorption power of the main paste doped with silver and antimony was determined to be useful in the gamma energy range from 80 to 140keV.This indicates that the newly doped textile material may be considered for radiation protection in the case of low-energy gamma rays.展开更多
Outdoor activities like mountain marathons and field expeditions often occur in harsh environments where maintaining power and body temperature are crucial for survival.Warm pastes are commonly used to provide warmth ...Outdoor activities like mountain marathons and field expeditions often occur in harsh environments where maintaining power and body temperature are crucial for survival.Warm pastes are commonly used to provide warmth in cold conditions,but their potential as a portable power source has not been fully explored.This research develops an innovative approach to convert warm-paste chemical energy into electrical power for emergencies.By designing a hydrogel-based iron-air battery with a low-temperature-resistant electrolyte,we created a battery capable of operating in low temperatures.Experimental results showed the battery generating 0.98 V of voltage and 2.68 Ah of capacity.The battery can be manually assembled using original warm paste materials and connected in series to power electronic devices like mobile phones,providing a vital communication tool in emergencies.This breakthrough offers a promising solution for enhancing safety and survival during outdoor activities.展开更多
The demand for low-temperature cured conductive silver pastes increases rapidly due to the development of advanced electronic fields,such as flexible electronics.Lowering curing temperatures of conductive silver paste...The demand for low-temperature cured conductive silver pastes increases rapidly due to the development of advanced electronic fields,such as flexible electronics.Lowering curing temperatures of conductive silver pastes is generally realized using low-boiling-point solvents.However,such solvents have a low viscosity,leading to the sedimentation of the conductive phase.Increasing the content of the highly viscous binder phase helps solve this issue,but it will lower the electric conductivity.Herein,the trade-off between curing temperature and conductivity of conductive silver pastes was overcome by applying nano-silver particles as the sedimentation inhibitor while bifunctional epoxidized cardol(E-Cardol),with flexible C15 side chains that can significantly enhance the toughness,as the binder.Experiments were performed to determine chemical compositions,reveal morphologies,and measure conductive resistivity values.Conductive silver pastes with a curing temperature of 140°C and a silver content of 65 wt.%were fabricated,exhibiting a resistivity of 3.10×10^(-5)Ω·cm,comparable to that of conventional low-temperature cured silver pastes with the silver content of 80 wt.%.Moreover,this silver paste also exhibited excellent adhesion performance and enhanced anti-folding property.展开更多
基金fund for this work was provided by the“Research on Key Technologies of Photosensitive Conductive Silver Paste Based on Domestic Circuit Protection Micro Chip Components”(Project No.BE2020008 and Supporting Author:Chen P).
文摘The poly(epoxy-N-methylaniline)conductive organic carrier was used as the bonding phase of the low-temperature conductive silver paste.Then,this was mixed with different proportions of silver powder to prepare the low-temperature conductive silver paste.Afterwards,the effect of the conductive organic carrier on the properties of the low-temperature conductive silver paste was determined by IR,DMA and SEM.The results revealed that the prepared conductive paste has good conductivity,film-forming performance,printing performance,low-temperature curing performance,and anti-aging performance.When the mass percentage of the bonding phase/conductive phase was 40/60,the lowest volume resistivity of the conductive silver paste was 4.9×10^(−6)Ω⋅cm,and the conductivity was the best.
基金supported by the National Natural Science Foundation of China(Nos.51972079 and 52302062)the National Key Research and Development Program of China(Nos.2022YFB370630202 and 2022YFB3706305).
文摘Electronic 3D printing possesses a remarkable molding ability and convenience in integrated circuits,flexible wearables,and individual automobile requirements.However,traditional 3D printing technology still struggles to meet the demands of high precision and high efficiency in the process of fabricating a curved surface circuit,particularly achieving precise silver circuit molding on irregular substrates.Here,a high-precision and muti-scaled conformal manufacturing method for silver circuits is presented through the digital light processing(DLP)of ultraviolet-curable silver paste(UV-SP)with adjustable photocuring properties,enabling the successful preparation of micro-scaled conductive structure on the sharply skewed hook face.The minimum modeling depth and width of the cured silver paste can be well controlled to 10 and 88µm,respectively.Compared with traditional printing technology,the printing efficiency of complex patterns has increased by over 70%.The printed silver circuit demonstrates an exceptionally high electrical conductivity,reaching as high as 1.16×10^(7) S/m.Additionally,the UV-SP exhibits significant manufacturing efficiency and superior molding resolution compared to conventional direct ink writing and inkjet printing techniques,thereby contributing to the attainment of high precision and efficiency of conformal and micro-molding manufacturing in sensors,communication antennas,and other electronic devices based on curved substrates.
基金supported by the National High Technology Research and Development Program of China (No.2016YFB0100602)。
文摘The traditional hermetic packaging methods,which require high temperatures and high voltages,would have adverse effects on electronics devices.Based on current-assisted sintering technology,we proposed a new hermetic packaging method using silver paste.Comparing the microstructure of the joints sintered with different currents,we found that with the increasing sintering current from 4.7 kA to 5.3 kA,the density of the joint increases,which improves the hermeticity and bonding strength of the joints.The results of thermal cycling tests showed that the sealing joints sintered at 4.7 kA with larger porosity are more prone to fail because pores tend to be sources of defects under thermal cycling.After 250 ℃ high thermal storage,there is the coarsening of the pores and the delamination near the Ag/Au interface,degrading the sealing performance of the sintered joint.Besides,the sealing joints sintered at 5.3 kA exhibit superior reliability when exposed to high temperatures.
文摘Strain sensors for human-motion detection must offer high stretchability, high sensitivity, fast response, and high recovery speed. In this study, we choose silver paste as a sensing material and use a screen printing method to fabricate the strain sensor based upon an electrical-resistance mechanism. After curing elastomeric polyurethane film with a thickness of 150 μm on PET film, the polyester resin mixed with blocked isocyanate curing agent was coated as a masking layer to reduce the film’s stickiness. The effect of the polyester masking layer upon the silver paste screen printing process was examined using a rolling-ball-tack test, TGA analysis of polyester resins, and cured silver-electrode films. The cost-effective strain sensor fabricated by using silver paste and screen printing processes on the stretchable-polyurethane-substrate film showed high sensitivity and fast response in a strain range of up to 100%.
基金supported by the Sinop University Scientific Research Projects Coordinator(No.GMYO-1901-16-14)。
文摘In the present study,we investigate several textile coating pastes used in the market based on their radiation protection capability for gamma rays.The gamma ray mass absorption coefficients of some coating pastes doped with antimony,boron and silver elements have been investigated.It has been determined that the gamma ray mass attenuation coefficient decreases rapidly as the energy of the gamma rays increases.It was determined that the doping of the main printing paste with silver and antimony considerably increased the gamma ray absorption capability of main paste.However,the doping of the paste with boron reduces the mass absorption of gamma rays.In particular,the gamma ray mass absorption power of the main paste doped with silver and antimony was determined to be useful in the gamma energy range from 80 to 140keV.This indicates that the newly doped textile material may be considered for radiation protection in the case of low-energy gamma rays.
基金supported by the National Key Research and Development Program of China(2022YFB2502104)the National Natural Science Foundation of China(22179059,22239002,22209070,and 22409086)+2 种基金Science and Technology Innovation Fund for Emission Peak and Carbon Neutrality of Jiangsu Province(BK20231512 and BK20220034)the Natural Science Foundation of Jiangsu Province(BK20241208)the Jiangsu Funding Program for Excellent Postdoctoral Talent(2024ZB287)。
文摘Outdoor activities like mountain marathons and field expeditions often occur in harsh environments where maintaining power and body temperature are crucial for survival.Warm pastes are commonly used to provide warmth in cold conditions,but their potential as a portable power source has not been fully explored.This research develops an innovative approach to convert warm-paste chemical energy into electrical power for emergencies.By designing a hydrogel-based iron-air battery with a low-temperature-resistant electrolyte,we created a battery capable of operating in low temperatures.Experimental results showed the battery generating 0.98 V of voltage and 2.68 Ah of capacity.The battery can be manually assembled using original warm paste materials and connected in series to power electronic devices like mobile phones,providing a vital communication tool in emergencies.This breakthrough offers a promising solution for enhancing safety and survival during outdoor activities.
基金supported by the National Key Research and Development Program of China(Grant No.2024YFB3816400)the National Natural Science Foundation of China(Grant Nos.52222103,52350322,and 52432009)the Zhejiang Provincial Natural Science Foundation(Grant Nos.LD24E010007 and LD25B060003).
文摘The demand for low-temperature cured conductive silver pastes increases rapidly due to the development of advanced electronic fields,such as flexible electronics.Lowering curing temperatures of conductive silver pastes is generally realized using low-boiling-point solvents.However,such solvents have a low viscosity,leading to the sedimentation of the conductive phase.Increasing the content of the highly viscous binder phase helps solve this issue,but it will lower the electric conductivity.Herein,the trade-off between curing temperature and conductivity of conductive silver pastes was overcome by applying nano-silver particles as the sedimentation inhibitor while bifunctional epoxidized cardol(E-Cardol),with flexible C15 side chains that can significantly enhance the toughness,as the binder.Experiments were performed to determine chemical compositions,reveal morphologies,and measure conductive resistivity values.Conductive silver pastes with a curing temperature of 140°C and a silver content of 65 wt.%were fabricated,exhibiting a resistivity of 3.10×10^(-5)Ω·cm,comparable to that of conventional low-temperature cured silver pastes with the silver content of 80 wt.%.Moreover,this silver paste also exhibited excellent adhesion performance and enhanced anti-folding property.
