Flexible tactile sensors are receiving considerable interest due to their potential in diverse fields,including physiological monitoring and wearable electronics.Despite numerous studies to broaden their practical use...Flexible tactile sensors are receiving considerable interest due to their potential in diverse fields,including physiological monitoring and wearable electronics.Despite numerous studies to broaden their practical use,it remains difficult to simultaneously attain high sensitivity and a wide-range pressure detection.In this study,we have fabricated a tactile sensor with highly porous three-dimensional conductive architecture based on carbon nanotubes(CNTs)functionalized with gold nanoparticles(AuNPs).The zero-dimensional AuNPs,directly precipitated onto the CNT surface,exerted minimal effect on the sensor’s initial resistance.Upon applying pressure to the tactile sensor,the contact resistance among the AuNPs-precipitated CNTs changes significantly,resulting in a high sensitivity of 23.23 kPa^(-1) in the low-pressure range(0.05-500 kPa)and 11.06 kPa^(-1) in the high-pressure range(500-1125 kPa).The sensor also exhibits outstanding sensing characteristics,including low hysteresis and excellent repeatability.Leveraging these advantages,the sensor has successfully detected pulse wave signals,neck/jaw muscle movements,and walking motions,confirming its practical applicability in wearable healthcare technologies.展开更多
The air suspension and location specification properties of nanowires are crucial factors for optimizing nanowires in electronic devices and suppressing undesirable interactions with substrates.Although various strate...The air suspension and location specification properties of nanowires are crucial factors for optimizing nanowires in electronic devices and suppressing undesirable interactions with substrates.Although various strategies have been proposed to fabricate suspended nanowires,placing a nanowire in desired microstructures without material constraints or high-temperature processes remains a challenge.In this study,suspended nanowires were formed using a thermally aggregated electrospun polymer as a template.An elaborately designed microstructure enables an electrospun fiber template to be formed at the desired location during thermal treatment.Moreover,the desired thickness of the nanowires is easily controlled with the electrospun fiber templates,resulting in the parallel formation of suspended nanowires that are less than 100 nm thick.Furthermore,this approach facilitates the formation of suspended nanowires with various materials.This is accomplished by evaporating various materials onto the electrospun fiber template and by removing the template.Palladium,copper,tungsten oxide(WO3),and tin oxide nanowires are formed as examples to demonstrate the advantage of this approach in terms of nanowire material selection.Hydrogen(H2)and nitrogen dioxide(NO2)gas sensors comprising palladium and tungsten oxide,respectively,are demonstrated as exemplary devices of the proposed method.展开更多
基金supported by a National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(Nos.RS-2024-00457040 and RS-2023-00222166).
文摘Flexible tactile sensors are receiving considerable interest due to their potential in diverse fields,including physiological monitoring and wearable electronics.Despite numerous studies to broaden their practical use,it remains difficult to simultaneously attain high sensitivity and a wide-range pressure detection.In this study,we have fabricated a tactile sensor with highly porous three-dimensional conductive architecture based on carbon nanotubes(CNTs)functionalized with gold nanoparticles(AuNPs).The zero-dimensional AuNPs,directly precipitated onto the CNT surface,exerted minimal effect on the sensor’s initial resistance.Upon applying pressure to the tactile sensor,the contact resistance among the AuNPs-precipitated CNTs changes significantly,resulting in a high sensitivity of 23.23 kPa^(-1) in the low-pressure range(0.05-500 kPa)and 11.06 kPa^(-1) in the high-pressure range(500-1125 kPa).The sensor also exhibits outstanding sensing characteristics,including low hysteresis and excellent repeatability.Leveraging these advantages,the sensor has successfully detected pulse wave signals,neck/jaw muscle movements,and walking motions,confirming its practical applicability in wearable healthcare technologies.
基金supported by the National Research Foundation of Korea (NRF)grant funded by the Korea government (MSIT). (No.2021R1A2B5B03002850).
文摘The air suspension and location specification properties of nanowires are crucial factors for optimizing nanowires in electronic devices and suppressing undesirable interactions with substrates.Although various strategies have been proposed to fabricate suspended nanowires,placing a nanowire in desired microstructures without material constraints or high-temperature processes remains a challenge.In this study,suspended nanowires were formed using a thermally aggregated electrospun polymer as a template.An elaborately designed microstructure enables an electrospun fiber template to be formed at the desired location during thermal treatment.Moreover,the desired thickness of the nanowires is easily controlled with the electrospun fiber templates,resulting in the parallel formation of suspended nanowires that are less than 100 nm thick.Furthermore,this approach facilitates the formation of suspended nanowires with various materials.This is accomplished by evaporating various materials onto the electrospun fiber template and by removing the template.Palladium,copper,tungsten oxide(WO3),and tin oxide nanowires are formed as examples to demonstrate the advantage of this approach in terms of nanowire material selection.Hydrogen(H2)and nitrogen dioxide(NO2)gas sensors comprising palladium and tungsten oxide,respectively,are demonstrated as exemplary devices of the proposed method.
