The emergence of stretchable electronic technology has led to the development of many industries and facilitated many unprecedented applications,owing to its ability to bear var-ious deformations.However,conventional ...The emergence of stretchable electronic technology has led to the development of many industries and facilitated many unprecedented applications,owing to its ability to bear var-ious deformations.However,conventional solid elastomer sub-strates and encapsulation can severely restrict the free motion and deformation of patterned interconnects,leading to poten-tial mechanical failures and electrical breakdowns.To address this issue,we propose a design strategy of porous elastomer substrate and encapsulation to improve the stretchability of serpentine interconnects in island-bridge structures.The ser-pentine interconnects are fully bonded to the elastomer sub-strate,while segments above circular pores remain suspended,allowing for free deformation and a substantial improvement in elastic stretchability compared to the solid substrates.The pores ensure unimpeded interconnect deformations,and mod-erate porosity provides support while maintaining the initial planar state.Compared to conventional solid configurations,finite element analysis(FEA)demonstrates a substantial enhancement of elastic stretchability(e.g.=9 times without encapsulation and=7 times with encapsulation).Uniaxial cyc-lic loading fatigue experiments validate the enhanced elastic stretchability,indicating the mechanical stability of the porous design.With its intrinsic advantages in permeability,the pro-posed strategy has the potential to offer insightful inspiration and novel concepts for advancing the field of stretchable inorganic electronics.展开更多
Since the fouling-releasing ability of silicone elastomers increased as their modulus decreases, we designed and prepared composites with embedded tiny NaC1 crytals that were soluble after their immersion in water, re...Since the fouling-releasing ability of silicone elastomers increased as their modulus decreases, we designed and prepared composites with embedded tiny NaC1 crytals that were soluble after their immersion in water, resulting in water-filled porous elastomers. The scanning electron microscope images confirmed such a designed water-filling porous structure. The existence of many micro-drops of water in these specially designed elastomers decreased the shear storage modulus and increased the loss factors. The decrease of shear modulus plays a leading role here and is directly related to a lower critical peeling-off stress of a pseudo-barnacle on them. Therefore, such a novel preparation with cheap salts instead of an expensive silicone provides a better way to make fouling-release paints with a lower modulus, a lower critical peeling-off stress and a better fouling-release property without a significant decrease of the cross-linking density.展开更多
Fabrication of elastic pressure sensors with low cost,high sensitivity,and mechanical durability is important for wearables,electronic skins and soft robotics.Here,we develop high-sensitivity porous elastomeric sensor...Fabrication of elastic pressure sensors with low cost,high sensitivity,and mechanical durability is important for wearables,electronic skins and soft robotics.Here,we develop high-sensitivity porous elastomeric sensors for piezoresistive and capacitive pressure detection.Specifically,a porous polydimethylsiloxane(PDMS)sponge embedded with conductive fillers of carbon nanotubes(CNTs)or reduced graphene oxide(rGO)was fabricated by an in-situ sugar template strategy.The sensor demonstrates sensitive deformation to applied pressure,exhibiting large and fast response in resistance or capacitance for detection of a wide range of pressure(0‒5 kPa).PDMS,as a high-elasticity framework,enables creation of sensors with high sensitivity,excellent stability,and durability for long-term usage.The highest sensitivities of 22.1 and 68.3 kPa−1 can be attained by devices with 5%CNTs and 4%rGO,respectively.The geometrics of the sponge sensor is tailorable using tableting technology for different applications.The sensors demonstrate finger motion detection and heart-rate monitoring in real-time,as well as a capacitive sensor array for identification of pressure and shape of placed objects,exhibiting good potential for wearables and human-machine interactions.展开更多
基金support from the National Natural Science Foundation of China (Grant No.12172027)the Fundamental Research Funds for the Central Universities.X.M.acknowledges support from the National Natural Science Foundation of China (Grant Nos.12272023 and U23A20111)。
文摘The emergence of stretchable electronic technology has led to the development of many industries and facilitated many unprecedented applications,owing to its ability to bear var-ious deformations.However,conventional solid elastomer sub-strates and encapsulation can severely restrict the free motion and deformation of patterned interconnects,leading to poten-tial mechanical failures and electrical breakdowns.To address this issue,we propose a design strategy of porous elastomer substrate and encapsulation to improve the stretchability of serpentine interconnects in island-bridge structures.The ser-pentine interconnects are fully bonded to the elastomer sub-strate,while segments above circular pores remain suspended,allowing for free deformation and a substantial improvement in elastic stretchability compared to the solid substrates.The pores ensure unimpeded interconnect deformations,and mod-erate porosity provides support while maintaining the initial planar state.Compared to conventional solid configurations,finite element analysis(FEA)demonstrates a substantial enhancement of elastic stretchability(e.g.=9 times without encapsulation and=7 times with encapsulation).Uniaxial cyc-lic loading fatigue experiments validate the enhanced elastic stretchability,indicating the mechanical stability of the porous design.With its intrinsic advantages in permeability,the pro-posed strategy has the potential to offer insightful inspiration and novel concepts for advancing the field of stretchable inorganic electronics.
文摘Since the fouling-releasing ability of silicone elastomers increased as their modulus decreases, we designed and prepared composites with embedded tiny NaC1 crytals that were soluble after their immersion in water, resulting in water-filled porous elastomers. The scanning electron microscope images confirmed such a designed water-filling porous structure. The existence of many micro-drops of water in these specially designed elastomers decreased the shear storage modulus and increased the loss factors. The decrease of shear modulus plays a leading role here and is directly related to a lower critical peeling-off stress of a pseudo-barnacle on them. Therefore, such a novel preparation with cheap salts instead of an expensive silicone provides a better way to make fouling-release paints with a lower modulus, a lower critical peeling-off stress and a better fouling-release property without a significant decrease of the cross-linking density.
基金supported by the National Natural Science Foundation of China(Grant No.51403141),the Project Funded by China Postdoctoral Science Foundation(Grant No.2019M661931)the Prospective Application Research Project on Technology Innovation of Key Industries in Suzhou(Grant No.SYG201936)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(Grant No.KYCX202668).
文摘Fabrication of elastic pressure sensors with low cost,high sensitivity,and mechanical durability is important for wearables,electronic skins and soft robotics.Here,we develop high-sensitivity porous elastomeric sensors for piezoresistive and capacitive pressure detection.Specifically,a porous polydimethylsiloxane(PDMS)sponge embedded with conductive fillers of carbon nanotubes(CNTs)or reduced graphene oxide(rGO)was fabricated by an in-situ sugar template strategy.The sensor demonstrates sensitive deformation to applied pressure,exhibiting large and fast response in resistance or capacitance for detection of a wide range of pressure(0‒5 kPa).PDMS,as a high-elasticity framework,enables creation of sensors with high sensitivity,excellent stability,and durability for long-term usage.The highest sensitivities of 22.1 and 68.3 kPa−1 can be attained by devices with 5%CNTs and 4%rGO,respectively.The geometrics of the sponge sensor is tailorable using tableting technology for different applications.The sensors demonstrate finger motion detection and heart-rate monitoring in real-time,as well as a capacitive sensor array for identification of pressure and shape of placed objects,exhibiting good potential for wearables and human-machine interactions.
