Thin-film devices made of room-temperature liquid metals(LMs)have contributed to the development of electronic skin for human-robot/machine interfaces but still have limitations,including degradations of performance a...Thin-film devices made of room-temperature liquid metals(LMs)have contributed to the development of electronic skin for human-robot/machine interfaces but still have limitations,including degradations of performance and robustness under repeated deformations.In this paper,we describe an interesting phenomenon of the formation of LM microscale networks(LMMNs)and propose to use the LMMNs for fabricating thin-film conductors.A simple layer-by-layer(LBL)deposition process enables the growth of a hierarchical structure of LM microdroplets that forms a conductive network(i.e.,LMMN)when stretched.The strain-history behavior of LMMNs allows conductivity enhancement up to 2.37×10^(6) S m^(-1) in response to increased tensile strains.By adjusting the number of LM layers in LBL deposition,the gauge factor(0.2≤GF≤1),the linearity,and the sheet resistance of LMMN films can be easily controlled,providing high potentials in various applications,including skin-mountable circuits,energy harvesters,and soft artificial skin.展开更多
In many soft sensor systems,external wires for connecting the sensors to control circuits have posed practical problems,in terms of compact form factors and physical robustness.This study proposes a design of soft sen...In many soft sensor systems,external wires for connecting the sensors to control circuits have posed practical problems,in terms of compact form factors and physical robustness.This study proposes a design of soft sensor arrays that can operate with a drastically reduced number of wires without degrading the original performance.The proposed concept is an array of soft sensing modules,each of which consists of an inductor and a capacitor embedded next to the resistive sensing module,constructing a resistorinductor-capacitor band-pass filter.By adjusting the values of the capacitance and the inductance,unique frequency band is assigned to each sensing module,enabling the distinctive detection using only two external wires regardless of the number of modules.The multi-touch sensing functionality of the system is analytically modeled and experimentally characterized.Taking advantage of the design,a fingertip tactile sensor and an insole foot pressure sensor are demonstrated as practical applications.展开更多
基金supported in part by the National Research Foundation of Korea (Grant NRF-2016R1A5A1938472)funded by the Korean Government (MSIT)in part by Institute of Information&communications Technology Planning&Evaluation (IITP)grant funded by the Korea government (MSIT) (Grant No.2021-0-00896).
文摘Thin-film devices made of room-temperature liquid metals(LMs)have contributed to the development of electronic skin for human-robot/machine interfaces but still have limitations,including degradations of performance and robustness under repeated deformations.In this paper,we describe an interesting phenomenon of the formation of LM microscale networks(LMMNs)and propose to use the LMMNs for fabricating thin-film conductors.A simple layer-by-layer(LBL)deposition process enables the growth of a hierarchical structure of LM microdroplets that forms a conductive network(i.e.,LMMN)when stretched.The strain-history behavior of LMMNs allows conductivity enhancement up to 2.37×10^(6) S m^(-1) in response to increased tensile strains.By adjusting the number of LM layers in LBL deposition,the gauge factor(0.2≤GF≤1),the linearity,and the sheet resistance of LMMN films can be easily controlled,providing high potentials in various applications,including skin-mountable circuits,energy harvesters,and soft artificial skin.
基金supported in part by the National Research Foundation (NRF) (Grant No.:NRF-2016R1A5A1938472)Institute of Information&Communications Technology Planning&Evaluation (IITP) (Grant No.:2021-0-00896)both funded by the Korea Government (MSIT)in part by the Technology Innovation Program (Grant No.:20008912)also funded by the Korea Government (MOTIE).
文摘In many soft sensor systems,external wires for connecting the sensors to control circuits have posed practical problems,in terms of compact form factors and physical robustness.This study proposes a design of soft sensor arrays that can operate with a drastically reduced number of wires without degrading the original performance.The proposed concept is an array of soft sensing modules,each of which consists of an inductor and a capacitor embedded next to the resistive sensing module,constructing a resistorinductor-capacitor band-pass filter.By adjusting the values of the capacitance and the inductance,unique frequency band is assigned to each sensing module,enabling the distinctive detection using only two external wires regardless of the number of modules.The multi-touch sensing functionality of the system is analytically modeled and experimentally characterized.Taking advantage of the design,a fingertip tactile sensor and an insole foot pressure sensor are demonstrated as practical applications.
