Wearable sensors integrated with deep learning techniques have the potential to revolutionize seamless human-machine interfaces for real-time health monitoring,clinical diagnosis,and robotic applications.Nevertheless,...Wearable sensors integrated with deep learning techniques have the potential to revolutionize seamless human-machine interfaces for real-time health monitoring,clinical diagnosis,and robotic applications.Nevertheless,it remains a critical challenge to simultaneously achieve desirable mechanical and electrical performance along with biocompatibility,adhesion,self-healing,and environmental robustness with excellent sensing metrics.Herein,we report a multifunctional,anti-freezing,selfadhesive,and self-healable organogel pressure sensor composed of cobalt nanoparticle encapsulated nitrogen-doped carbon nanotubes(CoN CNT)embedded in a polyvinyl alcohol-gelatin(PVA/GLE)matrix.Fabricated using a binary solvent system of water and ethylene glycol(EG),the CoN CNT/PVA/GLE organogel exhibits excellent flexibility,biocompatibility,and temperature tolerance with remarkable environmental stability.Electrochemical impedance spectroscopy confirms near-stable performance across a broad humidity range(40%-95%RH).Freeze-tolerant conductivity under sub-zero conditions(-20℃)is attributed to the synergistic role of CoN CNT and EG,preserving mobility and network integrity.The Co N CNT/PVA/GLE organogel sensor exhibits high sensitivity of 5.75 k Pa^(-1)in the detection range from 0 to 20 k Pa,ideal for subtle biomechanical motion detection.A smart human-machine interface for English letter recognition using deep learning achieved 98%accuracy.The organogel sensor utility was extended to detect human gestures like finger bending,wrist motion,and throat vibration during speech.展开更多
Biodegradable and biocompatible organic polymers play a pivotal role in designing the next generation of wearable smart electronics,reducing electronic waste and carbon emissions while promoting a toxin-free environme...Biodegradable and biocompatible organic polymers play a pivotal role in designing the next generation of wearable smart electronics,reducing electronic waste and carbon emissions while promoting a toxin-free environment.Herein,an electrospun fibrous polyhydroxybutyrate(PHB)organic mat-based,energy-autonomous,skin-adaptable temperature sensor is developed,eliminating the need for additional storage or circuit components.The electrospun PHB mat exhibits an enhancedβ-crystalline phase with aβ/αphase ratio of 3.96 using 1,1,1,3,3,3-hexafluoro-2-propanol as a solvent.Solvent and film processing techniques were tailored to obtain high-quality PHB films with the desired thickness,flexibility,and phase conversion.The PHB mat-based temperature sensor(PHB–TS)exhibits a negative temperature coefficient of resistance,with a sensitivity of−2.94%/°C and a thermistor constant of 4676 K,outperforming pure metals and carbon-based sensors.A triboelectric nanogenerator(TENG)based on the enhancedβ-phase PHB mat was fabricated,delivering an output of 156 V,0.43μA,and a power density of 1.71 mW/m^(2).The energy-autonomous PHB–TS was attached to the index finger to monitor temperature changes upon contact with hot and cold surfaces,demonstrating good reliability and endurance.展开更多
Tailoring atomically dispersed single-atom catalyst(Fe-SAC)holding well-defined coordination structure(Fe-N_(4))along with precise control over morphology is a critical challenge.Herein,we propose a novel acid-amine c...Tailoring atomically dispersed single-atom catalyst(Fe-SAC)holding well-defined coordination structure(Fe-N_(4))along with precise control over morphology is a critical challenge.Herein,we propose a novel acid-amine coupling reaction between metalchelated ionic liquid([1-(3-aminopropyl)3-methylimidazolium tetrachloroferrate(III)][APIM]+[FeCl_(4)]−)and carboxylic groups of carbon allotropes(C=GO,CNT,CNF,and vX-72)to precisely immobilize Fe-N_(x) sites.Out of designed single-atom catalyst(IL-Fe-SAC-C),Fe-N_(4) on graphene(IL-Fe-SAC-Gr)delivered superior oxygen reduction reaction(ORR)activity by holding higher halfwave potential of 0.882 V versus RHE in 1.0 M KOH akin to Pt/C(0.878 V vs.RHE)and surpassing recently reported M–N–C catalysts with superior ethanol tolerance.Thanks to higher graphitization degree,enhanced surface characteristics,and richness in high-density Fe-N_(4) sites of IL-Fe-SAC-Gr confirmed by XPS,X-ray absorption spectroscopy(XAS),and HAADF analysis.The IL-Fe-SAC-Gr catalyst-coated cathode on testing in flexible direct ethanol fuel cells(f-DEFC)delivered higher peak power density of 18mWcm^(−2) by outperforming Pt/C-based cathode by 3.5 times as a result of excellent ethanol tolerance.Further,the developed f-DEFCsuccessfully powered the Internet of Things(IoT)-based health monitoring system.This method demonstrates novel strategy to tailor high-performance single-atom(Fe-SAC-C)sites on desired morphologies to meet specific application requirements with feasibility and versatility.展开更多
基金supported by the Basic Science Research Program(2023R1A2C3004336,RS-202300243807)&Regional Leading Research Center(RS-202400405278)through the National Research Foundation of Korea(NRF)grant funded by the Korea Government(MSIT)。
文摘Wearable sensors integrated with deep learning techniques have the potential to revolutionize seamless human-machine interfaces for real-time health monitoring,clinical diagnosis,and robotic applications.Nevertheless,it remains a critical challenge to simultaneously achieve desirable mechanical and electrical performance along with biocompatibility,adhesion,self-healing,and environmental robustness with excellent sensing metrics.Herein,we report a multifunctional,anti-freezing,selfadhesive,and self-healable organogel pressure sensor composed of cobalt nanoparticle encapsulated nitrogen-doped carbon nanotubes(CoN CNT)embedded in a polyvinyl alcohol-gelatin(PVA/GLE)matrix.Fabricated using a binary solvent system of water and ethylene glycol(EG),the CoN CNT/PVA/GLE organogel exhibits excellent flexibility,biocompatibility,and temperature tolerance with remarkable environmental stability.Electrochemical impedance spectroscopy confirms near-stable performance across a broad humidity range(40%-95%RH).Freeze-tolerant conductivity under sub-zero conditions(-20℃)is attributed to the synergistic role of CoN CNT and EG,preserving mobility and network integrity.The Co N CNT/PVA/GLE organogel sensor exhibits high sensitivity of 5.75 k Pa^(-1)in the detection range from 0 to 20 k Pa,ideal for subtle biomechanical motion detection.A smart human-machine interface for English letter recognition using deep learning achieved 98%accuracy.The organogel sensor utility was extended to detect human gestures like finger bending,wrist motion,and throat vibration during speech.
基金the Basic Science Research Program(RS-2023-NR077252,RS-2023-00243807)Regional Leading Research Center(RS-2024-00405278)+1 种基金the National Research Foundation of Korea(NRF)grant funded by the Korea Government(MSIT)the National Research Foundation of Korea(NRF)grant(No.RS-2024-00403822)funded by the Korea government(MSIT).
文摘Biodegradable and biocompatible organic polymers play a pivotal role in designing the next generation of wearable smart electronics,reducing electronic waste and carbon emissions while promoting a toxin-free environment.Herein,an electrospun fibrous polyhydroxybutyrate(PHB)organic mat-based,energy-autonomous,skin-adaptable temperature sensor is developed,eliminating the need for additional storage or circuit components.The electrospun PHB mat exhibits an enhancedβ-crystalline phase with aβ/αphase ratio of 3.96 using 1,1,1,3,3,3-hexafluoro-2-propanol as a solvent.Solvent and film processing techniques were tailored to obtain high-quality PHB films with the desired thickness,flexibility,and phase conversion.The PHB mat-based temperature sensor(PHB–TS)exhibits a negative temperature coefficient of resistance,with a sensitivity of−2.94%/°C and a thermistor constant of 4676 K,outperforming pure metals and carbon-based sensors.A triboelectric nanogenerator(TENG)based on the enhancedβ-phase PHB mat was fabricated,delivering an output of 156 V,0.43μA,and a power density of 1.71 mW/m^(2).The energy-autonomous PHB–TS was attached to the index finger to monitor temperature changes upon contact with hot and cold surfaces,demonstrating good reliability and endurance.
基金supported by the Basic Science Research Program(2023R1A2C3004336)Regional Leading Research Center(RS-2024-00405278)through the National Research Foundation of Korea(NRF)grant funded by the Korea Government(MSIT).
文摘Tailoring atomically dispersed single-atom catalyst(Fe-SAC)holding well-defined coordination structure(Fe-N_(4))along with precise control over morphology is a critical challenge.Herein,we propose a novel acid-amine coupling reaction between metalchelated ionic liquid([1-(3-aminopropyl)3-methylimidazolium tetrachloroferrate(III)][APIM]+[FeCl_(4)]−)and carboxylic groups of carbon allotropes(C=GO,CNT,CNF,and vX-72)to precisely immobilize Fe-N_(x) sites.Out of designed single-atom catalyst(IL-Fe-SAC-C),Fe-N_(4) on graphene(IL-Fe-SAC-Gr)delivered superior oxygen reduction reaction(ORR)activity by holding higher halfwave potential of 0.882 V versus RHE in 1.0 M KOH akin to Pt/C(0.878 V vs.RHE)and surpassing recently reported M–N–C catalysts with superior ethanol tolerance.Thanks to higher graphitization degree,enhanced surface characteristics,and richness in high-density Fe-N_(4) sites of IL-Fe-SAC-Gr confirmed by XPS,X-ray absorption spectroscopy(XAS),and HAADF analysis.The IL-Fe-SAC-Gr catalyst-coated cathode on testing in flexible direct ethanol fuel cells(f-DEFC)delivered higher peak power density of 18mWcm^(−2) by outperforming Pt/C-based cathode by 3.5 times as a result of excellent ethanol tolerance.Further,the developed f-DEFCsuccessfully powered the Internet of Things(IoT)-based health monitoring system.This method demonstrates novel strategy to tailor high-performance single-atom(Fe-SAC-C)sites on desired morphologies to meet specific application requirements with feasibility and versatility.
