High-performance energy storage and sensing devices have been undergoing rapid development to meet the demand for portable and wearable electronic products,which require flexibility,extensibility,small volume and ligh...High-performance energy storage and sensing devices have been undergoing rapid development to meet the demand for portable and wearable electronic products,which require flexibility,extensibility,small volume and lightweight.In this study,we construct a lightweight and flexible self-powered sensing system by integrating a highly stretchable strain sensor with a high-performance asymmetric supercapacitor based on ZnSe/CoSe_(2)//ECNT(ECNT:electrochemically activated carbon nanotube film).The ZnSe/CoSe_(2) two-dimentional nanosheets on carbon nanotube(CNT)films are synthesized through a simple and efficient strategy derived from ZnCo-based metal-organic frameworks(MOFs).The density functional theory(DFT)simulations show the higher conductivity of the ZnSe/CoSe_(2)/CNT electrode than the CoSe_(2)/CNT electrode.Due to the synergistic properties of self-supported two-dimentional ZnSe/CoSe_(2) nanosheets with high specific surface area and the high pathway of one-dimention CNTs,the nanocomposite electrode provides efficient transmission and short paths for electron/ion diffusion.The asymmetric supercapacitor provides a stable output power supply to the sensors that can precisely respond to strain and pressure changes.The sensor can also be attached to a garment for measuring a variety of joint movements.展开更多
The discovery of drawable carbon nanotube forests opened up the possibility of constructing a wide range of pure carbon nanotube macrostructures and sparked interests in developing applications from these structures, ...The discovery of drawable carbon nanotube forests opened up the possibility of constructing a wide range of pure carbon nanotube macrostructures and sparked interests in developing applications from these structures, especially pure carbon nanotube yarns. This review examines the various facets of the draw- able carbon nanotube forests, synthesis and drawability, and their resulting yarns, structure, production, properties and applications. The structure, formation and properties of carbon nanotube yarns are com- pared with those of conventional textile yarns in order to obtain a better understanding of the science, structural mechanics and processing technology involved in carbon nanotube yarns.展开更多
The electrical conductivity of carbon nanotube buckypapers can be dramatically increased by incorporation of silver particles contained in a commercial silver paste.Two methods,co-dispersion during the production of b...The electrical conductivity of carbon nanotube buckypapers can be dramatically increased by incorporation of silver particles contained in a commercial silver paste.Two methods,co-dispersion during the production of buckypaper and surface coating on a preformed buckypaper,were used to prepare composite buckypapers.The two types of composite buckypapers exhibited very different electrical conductivity profiles.The composite buckypapers prepared by the surface coating method showed a distinct step transition in electrical conductivity at 3 vol%silver content,leading to a 15-fold improvement at 6%silver content.The composite buckypapers prepared by the co-dispersion method showed a gradual change in electrical conductivity with increasing silver particle content,resulting in a five-fold improvement at12%silver content.Surface and sectional morphologies of the two types of composite buckypapers were examined and related to their electrical conductivity profiles.展开更多
基金support of the National Natural Science Foundation of China(Nos.51702369 and 51873233)Hubei Provincial Natural Science Foundation(No.2018CFA023)the Fundamental Research Funds for the Central Universities(No.CZP20006).
文摘High-performance energy storage and sensing devices have been undergoing rapid development to meet the demand for portable and wearable electronic products,which require flexibility,extensibility,small volume and lightweight.In this study,we construct a lightweight and flexible self-powered sensing system by integrating a highly stretchable strain sensor with a high-performance asymmetric supercapacitor based on ZnSe/CoSe_(2)//ECNT(ECNT:electrochemically activated carbon nanotube film).The ZnSe/CoSe_(2) two-dimentional nanosheets on carbon nanotube(CNT)films are synthesized through a simple and efficient strategy derived from ZnCo-based metal-organic frameworks(MOFs).The density functional theory(DFT)simulations show the higher conductivity of the ZnSe/CoSe_(2)/CNT electrode than the CoSe_(2)/CNT electrode.Due to the synergistic properties of self-supported two-dimentional ZnSe/CoSe_(2) nanosheets with high specific surface area and the high pathway of one-dimention CNTs,the nanocomposite electrode provides efficient transmission and short paths for electron/ion diffusion.The asymmetric supercapacitor provides a stable output power supply to the sensors that can precisely respond to strain and pressure changes.The sensor can also be attached to a garment for measuring a variety of joint movements.
文摘The discovery of drawable carbon nanotube forests opened up the possibility of constructing a wide range of pure carbon nanotube macrostructures and sparked interests in developing applications from these structures, especially pure carbon nanotube yarns. This review examines the various facets of the draw- able carbon nanotube forests, synthesis and drawability, and their resulting yarns, structure, production, properties and applications. The structure, formation and properties of carbon nanotube yarns are com- pared with those of conventional textile yarns in order to obtain a better understanding of the science, structural mechanics and processing technology involved in carbon nanotube yarns.
文摘The electrical conductivity of carbon nanotube buckypapers can be dramatically increased by incorporation of silver particles contained in a commercial silver paste.Two methods,co-dispersion during the production of buckypaper and surface coating on a preformed buckypaper,were used to prepare composite buckypapers.The two types of composite buckypapers exhibited very different electrical conductivity profiles.The composite buckypapers prepared by the surface coating method showed a distinct step transition in electrical conductivity at 3 vol%silver content,leading to a 15-fold improvement at 6%silver content.The composite buckypapers prepared by the co-dispersion method showed a gradual change in electrical conductivity with increasing silver particle content,resulting in a five-fold improvement at12%silver content.Surface and sectional morphologies of the two types of composite buckypapers were examined and related to their electrical conductivity profiles.
