Electronic fibers used to fabricate wearable triboelectric nanogenerator(TENG) for harvesting human mechanical energy have been extensively explored. However, little attention is paid to their mutual advantages of env...Electronic fibers used to fabricate wearable triboelectric nanogenerator(TENG) for harvesting human mechanical energy have been extensively explored. However, little attention is paid to their mutual advantages of environmental friendliness, mechanical properties, and stability. Here, we report a super-strong, biodegradable, and washable cellulose-based conductive macrofibers, which is prepared by wet-stretching and wet-twisting bacterial cellulose hydrogel incorporated with carbon nanotubes and polypyrrole. The cellulose-based conductive macrofibers possess high tensile strength of 449 MPa(able to lift 2 kg weights), good electrical conductivity(~ 5.32 S cm^(-1)), and excellent stability(Tensile strength and conductivity only decrease by 6.7% and 8.1% after immersing in water for 1 day). The degradation experiment demonstrates macrofibers can be degraded within 108 h in the cellulase solution. The designed fabric-based TENG from the cellulose-base conductive macrofibers shows a maximum open-circuit voltage of 170 V, short-circuit current of 0.8 μA, and output power at 352 μW, which is capable of powering the commercial electronics by charging the capacitors. More importantly, the fabric-based TENGs can be attached to the human body and work as self-powered sensors to effectively monitor human motions. This study suggests the potential of biodegradable, super-strong, and washable conductive cellulose-based fiber for designing eco-friendly fabric-based TENG for energy harvesting and biomechanical monitoring.展开更多
Combination flexible and stretchable textiles with self-powered sensors bring a novel insight into wearable functional electronics and cyber security in the era of Internet of Things.This work presents a highly flexib...Combination flexible and stretchable textiles with self-powered sensors bring a novel insight into wearable functional electronics and cyber security in the era of Internet of Things.This work presents a highly flexible and self-powered fully fabric-based triboelectric nanogenerator(F-TENG)with sandwiched structure for biomechanical energy harvesting and real-time biometric authentication.The prepared F-TENG can power a digital watch by low-frequency motion and respond to the pressure change by the fall of leaves.A self-powered wearable keyboard(SPWK)is also fabricated by integrating large-area F-TENG sensor arrays,which not only can trace and record electrophysiological signals,but also can identify individuals’typing characteristics by means of the Haar wavelet.Based on these merits,the SPWK has promising applications in the realm of wearable electronics,self-powered sensors,cyber security,and artificial intelligences.展开更多
According to clinical studies,upper limb robotic suits are vital to reduce therapist fatigue and accelerate patient rehabilitation.Soft pneumatic actuators have drawn increasing attention for the development of wearab...According to clinical studies,upper limb robotic suits are vital to reduce therapist fatigue and accelerate patient rehabilitation.Soft pneumatic actuators have drawn increasing attention for the development of wearable robots due to their low weight,flexibility,and high power-to-weight ratio.However,most of current actuators were designed for the flexion assistance of a specific joint,and that for joint extension requires further investigation.Furthermore,designing an actuator for diverse working scenarios remains a challenge.In this paper,we propose an all-fabric bi-directional actuator to assist the flexion and extension of the elbow,wrist,and fingers.A mathematical model is presented that predicts the deformation and guides the design of the proposed bi-directional actuator.To further validate the applicability and adaptability of the proposed actuator for different joints,we developed a 3-DOF soft robotic suit.Preliminary results show that the robotic suit can assist the motion of the elbow,wrist,and finger of the subject.展开更多
Widespread reliance on fossil fuels,and the resulting imbalance between energy supply and demand have emerged as significant obstacles to achieving sustainable development.Triboelectric nanogenerators(TENGs)offer a vi...Widespread reliance on fossil fuels,and the resulting imbalance between energy supply and demand have emerged as significant obstacles to achieving sustainable development.Triboelectric nanogenerators(TENGs)offer a viable solution to this problem.Among the various materials used in TENGs,fabrics with geometric structures have attracted considerable interest because of their advantageous properties,such as their light weight,breathable structures,favorable softness,and excellent breathability.This review provides a comprehensive introduction to fabric geometric(fabric structure with yarn as the basic unit,including woven fabrics formed by warp and weft yarns and knitted fabrics formed by yarn coils,etc.)TENGs,including their definition,working principle,and mechanisms,and explores the recent progress in TENGs based on one-,two-,and three-dimensional structures,classifying them into woven and knitted fabrics according to the fabrication method.We summarize the advantages and disadvantages of TENGs with different dimensions.Considering the intrinsically limited conductivity of the fiber and fabric,progress in improving the comprehensive output performance of TENGs via combination with other conductive materials and surface modification is discussed.Finally,this review concludes with a discussion of the challenges,opportunities,and potential applications related to TENGs based on fabric geometric structures.This study is expected to provide readers with new strategies and conceptual ideas to improve the performance of TENGs constructed with fabrics,particularly through the optimization of their structures.展开更多
基金financially supported by BRICS STI Framework Programme 3rd call 2019the National Key Research and Development Program of China(Grant No.2018YFE0123700)+3 种基金the National Natural Science Foundation of China(Grant Nos.51973076 and 52073031)State Key Laboratory of New Textile Materials and Advanced Processing Technologies(Grant No.FZ2021005)the Fundamental Research Funds for the Central Universities(Grant Nos.2020kfyXJJS035,WUT2018IVB006,and Z191100001119047)。
文摘Electronic fibers used to fabricate wearable triboelectric nanogenerator(TENG) for harvesting human mechanical energy have been extensively explored. However, little attention is paid to their mutual advantages of environmental friendliness, mechanical properties, and stability. Here, we report a super-strong, biodegradable, and washable cellulose-based conductive macrofibers, which is prepared by wet-stretching and wet-twisting bacterial cellulose hydrogel incorporated with carbon nanotubes and polypyrrole. The cellulose-based conductive macrofibers possess high tensile strength of 449 MPa(able to lift 2 kg weights), good electrical conductivity(~ 5.32 S cm^(-1)), and excellent stability(Tensile strength and conductivity only decrease by 6.7% and 8.1% after immersing in water for 1 day). The degradation experiment demonstrates macrofibers can be degraded within 108 h in the cellulase solution. The designed fabric-based TENG from the cellulose-base conductive macrofibers shows a maximum open-circuit voltage of 170 V, short-circuit current of 0.8 μA, and output power at 352 μW, which is capable of powering the commercial electronics by charging the capacitors. More importantly, the fabric-based TENGs can be attached to the human body and work as self-powered sensors to effectively monitor human motions. This study suggests the potential of biodegradable, super-strong, and washable conductive cellulose-based fiber for designing eco-friendly fabric-based TENG for energy harvesting and biomechanical monitoring.
基金the National Key R&D Project from Minister of Science and Technology(Grant No.2016YFA0202704)the Beijing Municipal Natural Science Foundation(Grant No.2212052)+1 种基金the Shanghai Sailing Program(Grant No.19S28101)the Fundamental Research Funds for the Central Universities(Grant No.19D128102).
文摘Combination flexible and stretchable textiles with self-powered sensors bring a novel insight into wearable functional electronics and cyber security in the era of Internet of Things.This work presents a highly flexible and self-powered fully fabric-based triboelectric nanogenerator(F-TENG)with sandwiched structure for biomechanical energy harvesting and real-time biometric authentication.The prepared F-TENG can power a digital watch by low-frequency motion and respond to the pressure change by the fall of leaves.A self-powered wearable keyboard(SPWK)is also fabricated by integrating large-area F-TENG sensor arrays,which not only can trace and record electrophysiological signals,but also can identify individuals’typing characteristics by means of the Haar wavelet.Based on these merits,the SPWK has promising applications in the realm of wearable electronics,self-powered sensors,cyber security,and artificial intelligences.
基金The research is supported by the National Natural Science Foundation of China(52275002)the Open Laboratory Concept Verification Project of Zhongguancun National Demonstration Zone(Grant No.202005226).
文摘According to clinical studies,upper limb robotic suits are vital to reduce therapist fatigue and accelerate patient rehabilitation.Soft pneumatic actuators have drawn increasing attention for the development of wearable robots due to their low weight,flexibility,and high power-to-weight ratio.However,most of current actuators were designed for the flexion assistance of a specific joint,and that for joint extension requires further investigation.Furthermore,designing an actuator for diverse working scenarios remains a challenge.In this paper,we propose an all-fabric bi-directional actuator to assist the flexion and extension of the elbow,wrist,and fingers.A mathematical model is presented that predicts the deformation and guides the design of the proposed bi-directional actuator.To further validate the applicability and adaptability of the proposed actuator for different joints,we developed a 3-DOF soft robotic suit.Preliminary results show that the robotic suit can assist the motion of the elbow,wrist,and finger of the subject.
基金the National Natural Science Foundation of China(U21A2095)the Key Research and Development Program of Hubei Province(2021BAA068).
文摘Widespread reliance on fossil fuels,and the resulting imbalance between energy supply and demand have emerged as significant obstacles to achieving sustainable development.Triboelectric nanogenerators(TENGs)offer a viable solution to this problem.Among the various materials used in TENGs,fabrics with geometric structures have attracted considerable interest because of their advantageous properties,such as their light weight,breathable structures,favorable softness,and excellent breathability.This review provides a comprehensive introduction to fabric geometric(fabric structure with yarn as the basic unit,including woven fabrics formed by warp and weft yarns and knitted fabrics formed by yarn coils,etc.)TENGs,including their definition,working principle,and mechanisms,and explores the recent progress in TENGs based on one-,two-,and three-dimensional structures,classifying them into woven and knitted fabrics according to the fabrication method.We summarize the advantages and disadvantages of TENGs with different dimensions.Considering the intrinsically limited conductivity of the fiber and fabric,progress in improving the comprehensive output performance of TENGs via combination with other conductive materials and surface modification is discussed.Finally,this review concludes with a discussion of the challenges,opportunities,and potential applications related to TENGs based on fabric geometric structures.This study is expected to provide readers with new strategies and conceptual ideas to improve the performance of TENGs constructed with fabrics,particularly through the optimization of their structures.
