Touch-sensitive screens are crucial components of wearable devices.Materials such as reduced graphene oxide(rGO),carbon nanotubes(CNTs),and graphene offer promising solutions for flexible touch-sensitive screens.Howev...Touch-sensitive screens are crucial components of wearable devices.Materials such as reduced graphene oxide(rGO),carbon nanotubes(CNTs),and graphene offer promising solutions for flexible touch-sensitive screens.However,when stacked with flexible substrates to form multilayered capacitive touching sensors,these materials often suffer from substrate delamination in response to deformation;this is due to the materials having different Young’s modulus values.Delamination results in failure to offer accurate touch screen recognition.In this work,we demonstrate an induced charge-based mutual capacitive touching sensor capable of high-precision touch sensing.This is enabled by electron trapping and polarization effects related to mixed-coordinated bonding between copper nanoparticles and vertically grown graphene nanosheets.Here,we used an electron cyclotron resonance system to directly fabricate graphene-metal nanofilms(GMNFs)using carbon and copper,which are firmly adhered to flexible substrates.After being subjected to 3000 bending actions,we observed almost no change in touch sensitivity.The screen interaction system,which has a signal-to-noise ratio of 41.16 dB and resolution of 650 dpi,was tested using a handwritten Chinese character recognition trial and achieved an accuracy of 94.82%.Taken together,these results show the promise of touch-sensitive screens that use directly fabricated GMNFs for wearable devices.展开更多
Smart touch sensing lies at the core of emerging technologies such as wearable electronics,humanmachine interfaces,soft robotics,and interactive surfaces.Triboelectric nanogenerators(TENGs),which convert mechanical st...Smart touch sensing lies at the core of emerging technologies such as wearable electronics,humanmachine interfaces,soft robotics,and interactive surfaces.Triboelectric nanogenerators(TENGs),which convert mechanical stimuli into electrical signals by contact electrification and electrostatic induction,have emerged as promising candidates for such touch-based sensing platforms.Polydimethylsiloxane(PDMS)is widely used in flexible electronics due to its mechanical flexibility,biocompatibility,and dielectric properties.However,its low dielectric constant and charge leakage limit its ability to store and separate charges,reducing the triboelectric performance.To address this challenge,we present a dual-filler reinforcement strategy to significantly boost the triboelectric output of PDMS by incorporating a dielectric filler(barium strontium titanate(BST))and a conductive filler(graphite)into the PDMS matrix.Through this approach,we achieve synergistic effects that significantly improve surface charge density,dielectric constant,and charge trapping capability.Morphological,electrical,and mechanical characterizations demonstrate that the dual-filler approach leads to improved energy harvesting and touch sensing capabilities.This approach paves the way for high-performance,self-powered touch sensors with enhanced durability,making them ideal for applications in biomechanical monitoring and smart touch sensors.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52275565,52105593,and 62104155)the Natural Science Foundation of Guangdong Province,China(No.2022A1515011667)+2 种基金the Shenzhen Foundation Research Key Project(No.JCYJ20200109114244249)the Youth Talent Fund of Guangdong Province,China(No.2023A1515030292)the Shenzhen Excellent Youth Basic Research Fund(No.RCYX20231211090249068).
文摘Touch-sensitive screens are crucial components of wearable devices.Materials such as reduced graphene oxide(rGO),carbon nanotubes(CNTs),and graphene offer promising solutions for flexible touch-sensitive screens.However,when stacked with flexible substrates to form multilayered capacitive touching sensors,these materials often suffer from substrate delamination in response to deformation;this is due to the materials having different Young’s modulus values.Delamination results in failure to offer accurate touch screen recognition.In this work,we demonstrate an induced charge-based mutual capacitive touching sensor capable of high-precision touch sensing.This is enabled by electron trapping and polarization effects related to mixed-coordinated bonding between copper nanoparticles and vertically grown graphene nanosheets.Here,we used an electron cyclotron resonance system to directly fabricate graphene-metal nanofilms(GMNFs)using carbon and copper,which are firmly adhered to flexible substrates.After being subjected to 3000 bending actions,we observed almost no change in touch sensitivity.The screen interaction system,which has a signal-to-noise ratio of 41.16 dB and resolution of 650 dpi,was tested using a handwritten Chinese character recognition trial and achieved an accuracy of 94.82%.Taken together,these results show the promise of touch-sensitive screens that use directly fabricated GMNFs for wearable devices.
基金supported by the Post.-Doc.Scholarship Program of Korea University of Technology and Education(KOREATECH)。
文摘Smart touch sensing lies at the core of emerging technologies such as wearable electronics,humanmachine interfaces,soft robotics,and interactive surfaces.Triboelectric nanogenerators(TENGs),which convert mechanical stimuli into electrical signals by contact electrification and electrostatic induction,have emerged as promising candidates for such touch-based sensing platforms.Polydimethylsiloxane(PDMS)is widely used in flexible electronics due to its mechanical flexibility,biocompatibility,and dielectric properties.However,its low dielectric constant and charge leakage limit its ability to store and separate charges,reducing the triboelectric performance.To address this challenge,we present a dual-filler reinforcement strategy to significantly boost the triboelectric output of PDMS by incorporating a dielectric filler(barium strontium titanate(BST))and a conductive filler(graphite)into the PDMS matrix.Through this approach,we achieve synergistic effects that significantly improve surface charge density,dielectric constant,and charge trapping capability.Morphological,electrical,and mechanical characterizations demonstrate that the dual-filler approach leads to improved energy harvesting and touch sensing capabilities.This approach paves the way for high-performance,self-powered touch sensors with enhanced durability,making them ideal for applications in biomechanical monitoring and smart touch sensors.
