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
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
Wearable gas sensors can improve early warning provision for workers in special worksites and can also be used as flexible electronic platforms.Here,the flexible multifunctional gas sensor was prepared by grafting gra...Wearable gas sensors can improve early warning provision for workers in special worksites and can also be used as flexible electronic platforms.Here,the flexible multifunctional gas sensor was prepared by grafting graphene oxide(GO)-Ag onto cotton fabric after swelling.The maximum bacterial inhibition rate of GO-150/cotton fabric was 95.6%for E.coli and 87.6%for S.aureus,while retaining the original high moisture permeability of cotton fabric.So GO/cotton fabric can resist the multiplication of bacteria.At the same time,GO can greatly improve the UV protection performance of cotton fabric used in garments.With increase of the GO concentration,the UV protection ability of composite fabric is enhanced.Finally,GO-Ag/cotton fabric sensors had stable NH3 gassensitive properties and good washing stability.In conclusion,these cotton fabric sensors with antibacterial properties,UV resistance and highly sensitive gas-sensitive properties have potential applications in wearable early warning devices and textile products.展开更多
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.
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We thank the Scientific Research Foundation of Zhejiang Sci-Tech University(ZSTU)under Grant Nos.19082472-Y and 19012099-Y.
文摘Wearable gas sensors can improve early warning provision for workers in special worksites and can also be used as flexible electronic platforms.Here,the flexible multifunctional gas sensor was prepared by grafting graphene oxide(GO)-Ag onto cotton fabric after swelling.The maximum bacterial inhibition rate of GO-150/cotton fabric was 95.6%for E.coli and 87.6%for S.aureus,while retaining the original high moisture permeability of cotton fabric.So GO/cotton fabric can resist the multiplication of bacteria.At the same time,GO can greatly improve the UV protection performance of cotton fabric used in garments.With increase of the GO concentration,the UV protection ability of composite fabric is enhanced.Finally,GO-Ag/cotton fabric sensors had stable NH3 gassensitive properties and good washing stability.In conclusion,these cotton fabric sensors with antibacterial properties,UV resistance and highly sensitive gas-sensitive properties have potential applications in wearable early warning devices and textile products.
