随着通信网络、无线设备及航空航天的快速发展,电磁波危害日益加剧,因而亟需电磁屏蔽性能更优异的复合材料。本文采用MXene(Ti_(3)C_(2)Tx)、银纳米线(AgNWs)和多壁碳纳米管(MWCNTs)构建了双层的高导电三维(导电率最高为1.4×10^(4)...随着通信网络、无线设备及航空航天的快速发展,电磁波危害日益加剧,因而亟需电磁屏蔽性能更优异的复合材料。本文采用MXene(Ti_(3)C_(2)Tx)、银纳米线(AgNWs)和多壁碳纳米管(MWCNTs)构建了双层的高导电三维(导电率最高为1.4×10^(4)S·m^(-1))网络电磁屏蔽复合薄膜(Ti_(3)C_(2)TxMXene基功能复合薄膜)。特别是采取真空辅助抽滤法(VAF)将10 mL AgNWs及15 mL Ti_(3)C_(2)TxMXene的水溶液吸附于聚偏氟乙烯(PVDF)/MWCNTs复合薄膜之上,制备出的Ti_(3)C_(2)TxMXene基功能复合薄膜的总电磁干扰屏蔽效能(EMI SET)高达69.0 dB,比商用标准(20 dB)高出245%,其中吸收损耗效能(SEA)占比85.1%。说明Ti_(3)C_(2)TxMXene基功能复合薄膜主要的电磁损耗机制为吸收损耗,比电磁屏蔽效能(SSE/t)最高可达2719.8 dB/(cm^(-2)·g)。这项工作为新型MXene材料在电磁屏蔽复合材料中的应用提供了结构设计和研究思路。展开更多
Large-area AgNWs electrodes(25 cm×10 cm)were fabricated through roll-to-roll printing on the polyvinyl alcohol(PVA)modified water and oxygen barrier substrate.The modification of the barrier film with PVA improve...Large-area AgNWs electrodes(25 cm×10 cm)were fabricated through roll-to-roll printing on the polyvinyl alcohol(PVA)modified water and oxygen barrier substrate.The modification of the barrier film with PVA improved the wettability of silver nanowires on the barrier films and led to the formation of homogenous large-area AgNWs networks.The mechanical flexibility,especially the adhesion force between the silver electrode and the barrier film substrate was dramatically improved through PVA modification.The efficiency of 13.51%for the flexible OSCs with an area of 0.64 cm2 was achieved based on the PET/barrier film/PVA/AgNWs electrode.The long-term stability showed the flexible OSCs based on the PET/barrier film/PVA/AgNWs electrode have a significantly improved stability relative to the device on PET/AgNWs electrode,and comparable air stability as the rigid device with glass/ITO device.The unencapsulated devices maintained nearly 50%of the original efficiency after storage for 600 h in air.After a simple top encapsulation,the flexible devices remained at 60%of the initial efficiency after 2000 h in the air.Therefore,the flexible AgNWs electrode based on the barrier film would have the potential to improve the air storage stability of organic flexible solar cells.展开更多
All-solution processed organic solar cells are the ultimate aim of printable photovoltaics,but their electrical losses arising from poor contact of top electrodes greatly limit efficiency improvement.To solve the prob...All-solution processed organic solar cells are the ultimate aim of printable photovoltaics,but their electrical losses arising from poor contact of top electrodes greatly limit efficiency improvement.To solve the problem,a solution-processed hybrid top electrode was constructed using silver nanowires(AgNWs)as the skeleton and ZnO nanoparticles(ZnO-NPs)as the matrix.When constructing the skeleton,a spin-rinsing treatment was first used to reduce the amount of the residual insulating polyvinylpyrrolidone wrapped around the AgNWs to promote intimate contact among the AgNWs in the skeleton.Then,the ZnO-NPs matrix was deposited onto the AgNWs skeleton,bridging the AgNWs skeleton with the underlayer ZnO-NPs electron transporting layer(ETL).The underlayer ZnO-NPs ETL can also induce the growth of the ZnO-NPs matrix to minimize lattice mismatch,which creates additional transport channels from the ETL to the AgNWs skeleton for charge collection.As a result,the obtained electrode significantly enhances the electrical contact in the device,thus delivering record power conversion efficiencies of 16.04%and 14.54%for rigid and flexible all-solution processed OSCs,respectively.展开更多
Cross-aligned silver nanowires(CA-AgNWs),a unique networkwidely used in flexible transparent electrodes(FTEs),have been well developed using various solution processes.However,these approaches suffer from limitations ...Cross-aligned silver nanowires(CA-AgNWs),a unique networkwidely used in flexible transparent electrodes(FTEs),have been well developed using various solution processes.However,these approaches suffer from limitations of both the large alignment deviation and solution waste,especially in large-area fabrication,which deteriorates the performance of FTEs.Herein,we developed a facile liquid-bridge assisted Couette-flow solution shearing approach,which enables aligning AgNWs into a highly ordered horizontal array over a large area(120 cm^(2)).Particularly,the alignment deviation,evaluated by the statistic,full width at half-maximum,is rather small with a value of ca.12.6,several times lower than those made by other solution processes.The fibrous liquid-bridge is responsible for transferring liquid steadily onto the substrate,during which process AgNWs are aligned roughly by the solution shearing.It is worth noting that the enhanced shearing force(SF)by Couetteflow allows for further alignment.Consequently,the ultra-highly CA-AgNWs network was prepared,leading to a high-performance FTE with high conductivity(7Ωsq^(-1)),high transparency(93%),long lifetime(over 180 days),good adhesion-stability(200 times tape test),and good flexibility.Moreover,the strategy is applicable for mass-production,benefiting the practical applications of high-performance optoelectronic devices.展开更多
Inspired by the Chinese Knotting weave structure,an electromagnetic interference(EMI)nanofiber composite membrane with a twill surface was prepared.Poly(vinyl alcohol-co-ethylene)(Pva-co-PE)nanofibers and twill nylon ...Inspired by the Chinese Knotting weave structure,an electromagnetic interference(EMI)nanofiber composite membrane with a twill surface was prepared.Poly(vinyl alcohol-co-ethylene)(Pva-co-PE)nanofibers and twill nylon fabric were used as the matrix and filter templates,respectively.A Pva-co-PEMXene/silver nanowire(Pva-co-PE-MXene/AgNW,PM_(x)Ag)membrane was successfully prepared using a template method.When the MXene/AgNW content was only 7.4 wt%(PM_(7.4)Ag),the EMI shielding efficiency(SE)of the composite membrane with the oblique twill structure on the surface was 103.9 dB and the surface twill structure improved the EMI by 38.5%.This result was attributed to the pre-interference of the oblique twill structure in the direction of the incident EM wave,which enhanced the probability of the electromagnetic waves randomly colliding with the MXene nanosheets.Simultaneously,the internal reflection and ohmic and resonance losses were enhanced.The PM_(7.4)Ag membrane with the twill structure exhibited both an outstanding tensile strength of 22.8 MPa and EMI SE/t of 3925.2 dB cm^(-1).Moreover,the PM_(x)Ag nanocomposite membranes demonstrated an excellent thermal management performance,hydrophobicity,non-flammability,and performance stability,which was demonstrated by an EMI SE of 97.3%in a high-temperature environment of 140℃.The successful preparation of surface-twill composite membranes makes it difficult to achieve both a low filler content and a high EMI SE in electromagnetic shielding materials.This strategy provides a new approach for preparing thin membranes with excellent EMI properties.展开更多
Transparent, flexible electronic skin holds a wide range of applications in robotics, humanmachine interfaces, artificial intelligence, prosthetics, and health monitoring. Silver nanowire are mechanically flexible and...Transparent, flexible electronic skin holds a wide range of applications in robotics, humanmachine interfaces, artificial intelligence, prosthetics, and health monitoring. Silver nanowire are mechanically flexible and robust, which exhibit great potential in transparent and electricconducting thin film. Herein, we report on a silver-nanowire spray-coating and electrodemicrostructure replicating strategy to construct a transparent, flexible, and sensitive electronic skin device. The electronic skin device shows highly sensitive piezo-capacitance response to pressure. It is found that micropatterning the surface of dielectric layer polyurethane elastomer by replicating from microstructures of natural-existing surfaces such as lotus leaf, silk, and frosted glass can greatly enhance the piezo-capacitance performance of the device. The microstructured pressure sensors based on silver nanowire exhibit good transparency, excellent flexibility, wide pressure detection range （0-150 kPa）, and high sensitivity （1.28 kPa-1）.展开更多
文摘随着通信网络、无线设备及航空航天的快速发展,电磁波危害日益加剧,因而亟需电磁屏蔽性能更优异的复合材料。本文采用MXene(Ti_(3)C_(2)Tx)、银纳米线(AgNWs)和多壁碳纳米管(MWCNTs)构建了双层的高导电三维(导电率最高为1.4×10^(4)S·m^(-1))网络电磁屏蔽复合薄膜(Ti_(3)C_(2)TxMXene基功能复合薄膜)。特别是采取真空辅助抽滤法(VAF)将10 mL AgNWs及15 mL Ti_(3)C_(2)TxMXene的水溶液吸附于聚偏氟乙烯(PVDF)/MWCNTs复合薄膜之上,制备出的Ti_(3)C_(2)TxMXene基功能复合薄膜的总电磁干扰屏蔽效能(EMI SET)高达69.0 dB,比商用标准(20 dB)高出245%,其中吸收损耗效能(SEA)占比85.1%。说明Ti_(3)C_(2)TxMXene基功能复合薄膜主要的电磁损耗机制为吸收损耗,比电磁屏蔽效能(SSE/t)最高可达2719.8 dB/(cm^(-2)·g)。这项工作为新型MXene材料在电磁屏蔽复合材料中的应用提供了结构设计和研究思路。
基金supported by the National Natural Science Foundation of China(22135001)Youth Innovation Promotion Association(2019317)+4 种基金Young Cross Team Project of CAS(No.JCTD-2021-14)“Dual Carbon"Science and Technology Innovation of Jiangsu province(Industrial Prospect and Key Technology Research Program)(BE2022021)Suzhou Science and Technology Program(ST202219)CAS Special Research Assistant(SRA)Program of Suzhou Institute of Nano-Tech and Nano-Bionics(E355130101)grateful for the technical support for Jiangsu Funding Program for Excellent Postdoctoral Talent,Nano-X from Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences(A2107).
文摘Large-area AgNWs electrodes(25 cm×10 cm)were fabricated through roll-to-roll printing on the polyvinyl alcohol(PVA)modified water and oxygen barrier substrate.The modification of the barrier film with PVA improved the wettability of silver nanowires on the barrier films and led to the formation of homogenous large-area AgNWs networks.The mechanical flexibility,especially the adhesion force between the silver electrode and the barrier film substrate was dramatically improved through PVA modification.The efficiency of 13.51%for the flexible OSCs with an area of 0.64 cm2 was achieved based on the PET/barrier film/PVA/AgNWs electrode.The long-term stability showed the flexible OSCs based on the PET/barrier film/PVA/AgNWs electrode have a significantly improved stability relative to the device on PET/AgNWs electrode,and comparable air stability as the rigid device with glass/ITO device.The unencapsulated devices maintained nearly 50%of the original efficiency after storage for 600 h in air.After a simple top encapsulation,the flexible devices remained at 60%of the initial efficiency after 2000 h in the air.Therefore,the flexible AgNWs electrode based on the barrier film would have the potential to improve the air storage stability of organic flexible solar cells.
基金supported by the National Natural Science Foundation of China(52325307,52273188,22075194,52203233)the National Key Research and Development Program of China(2022YFB4200302)+3 种基金the Department of Science and Technology of Jiangsu Province(BE2022023)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),the Collaborative Innovation Center of Suzhou Nano Science and Technology,Jiangsu Funding Program for Excellent Postdoctoral Talent(2022ZB567)the China Postdoctoral Science Foundation(2023M732533)the Key Laboratory of Polymeric Materials Design and Synthesis for Biomedical Function,Soochow University。
文摘All-solution processed organic solar cells are the ultimate aim of printable photovoltaics,but their electrical losses arising from poor contact of top electrodes greatly limit efficiency improvement.To solve the problem,a solution-processed hybrid top electrode was constructed using silver nanowires(AgNWs)as the skeleton and ZnO nanoparticles(ZnO-NPs)as the matrix.When constructing the skeleton,a spin-rinsing treatment was first used to reduce the amount of the residual insulating polyvinylpyrrolidone wrapped around the AgNWs to promote intimate contact among the AgNWs in the skeleton.Then,the ZnO-NPs matrix was deposited onto the AgNWs skeleton,bridging the AgNWs skeleton with the underlayer ZnO-NPs electron transporting layer(ETL).The underlayer ZnO-NPs ETL can also induce the growth of the ZnO-NPs matrix to minimize lattice mismatch,which creates additional transport channels from the ETL to the AgNWs skeleton for charge collection.As a result,the obtained electrode significantly enhances the electrical contact in the device,thus delivering record power conversion efficiencies of 16.04%and 14.54%for rigid and flexible all-solution processed OSCs,respectively.
基金financially supported by the National Natural Science Foundation of China for Distinguished Young Scholar(grant no.22125201)the Beijing Natural Science Foundation(grant no.Z210018)+2 种基金the National Natural Science Foundation of China(grant nos.22102004 and 22202081)the National Postdoctoral Program for Innovative Talents(grant no.BX20200026)the Fundamental Research Funds for the Central Universities.
文摘Cross-aligned silver nanowires(CA-AgNWs),a unique networkwidely used in flexible transparent electrodes(FTEs),have been well developed using various solution processes.However,these approaches suffer from limitations of both the large alignment deviation and solution waste,especially in large-area fabrication,which deteriorates the performance of FTEs.Herein,we developed a facile liquid-bridge assisted Couette-flow solution shearing approach,which enables aligning AgNWs into a highly ordered horizontal array over a large area(120 cm^(2)).Particularly,the alignment deviation,evaluated by the statistic,full width at half-maximum,is rather small with a value of ca.12.6,several times lower than those made by other solution processes.The fibrous liquid-bridge is responsible for transferring liquid steadily onto the substrate,during which process AgNWs are aligned roughly by the solution shearing.It is worth noting that the enhanced shearing force(SF)by Couetteflow allows for further alignment.Consequently,the ultra-highly CA-AgNWs network was prepared,leading to a high-performance FTE with high conductivity(7Ωsq^(-1)),high transparency(93%),long lifetime(over 180 days),good adhesion-stability(200 times tape test),and good flexibility.Moreover,the strategy is applicable for mass-production,benefiting the practical applications of high-performance optoelectronic devices.
基金supported by the National Natural Science Foundation of China(12205225,52373063,and 51873166)。
文摘Inspired by the Chinese Knotting weave structure,an electromagnetic interference(EMI)nanofiber composite membrane with a twill surface was prepared.Poly(vinyl alcohol-co-ethylene)(Pva-co-PE)nanofibers and twill nylon fabric were used as the matrix and filter templates,respectively.A Pva-co-PEMXene/silver nanowire(Pva-co-PE-MXene/AgNW,PM_(x)Ag)membrane was successfully prepared using a template method.When the MXene/AgNW content was only 7.4 wt%(PM_(7.4)Ag),the EMI shielding efficiency(SE)of the composite membrane with the oblique twill structure on the surface was 103.9 dB and the surface twill structure improved the EMI by 38.5%.This result was attributed to the pre-interference of the oblique twill structure in the direction of the incident EM wave,which enhanced the probability of the electromagnetic waves randomly colliding with the MXene nanosheets.Simultaneously,the internal reflection and ohmic and resonance losses were enhanced.The PM_(7.4)Ag membrane with the twill structure exhibited both an outstanding tensile strength of 22.8 MPa and EMI SE/t of 3925.2 dB cm^(-1).Moreover,the PM_(x)Ag nanocomposite membranes demonstrated an excellent thermal management performance,hydrophobicity,non-flammability,and performance stability,which was demonstrated by an EMI SE of 97.3%in a high-temperature environment of 140℃.The successful preparation of surface-twill composite membranes makes it difficult to achieve both a low filler content and a high EMI SE in electromagnetic shielding materials.This strategy provides a new approach for preparing thin membranes with excellent EMI properties.
基金This work was supported by the National Natural Science Foundation of China （No.61674078） and Dongrun- Yau Science Silver Award （Chemistry）.
文摘Transparent, flexible electronic skin holds a wide range of applications in robotics, humanmachine interfaces, artificial intelligence, prosthetics, and health monitoring. Silver nanowire are mechanically flexible and robust, which exhibit great potential in transparent and electricconducting thin film. Herein, we report on a silver-nanowire spray-coating and electrodemicrostructure replicating strategy to construct a transparent, flexible, and sensitive electronic skin device. The electronic skin device shows highly sensitive piezo-capacitance response to pressure. It is found that micropatterning the surface of dielectric layer polyurethane elastomer by replicating from microstructures of natural-existing surfaces such as lotus leaf, silk, and frosted glass can greatly enhance the piezo-capacitance performance of the device. The microstructured pressure sensors based on silver nanowire exhibit good transparency, excellent flexibility, wide pressure detection range （0-150 kPa）, and high sensitivity （1.28 kPa-1）.
