With the widespread prevailing of flexible electronics in human-machine interfaces,health monitor,and human motion detection,ultrasoft flexible sensors are urgently desired with critical demands in conformality.Herein...With the widespread prevailing of flexible electronics in human-machine interfaces,health monitor,and human motion detection,ultrasoft flexible sensors are urgently desired with critical demands in conformality.Herein,a temperature-sensitive ionogel with near-infrared(NIR)-light controlled adhesion is prepared by electrostatic interaction of poly(diallyl dimethylammonium chloride)(PDDA)and acrylic acid,as well as the incorporation of the conductive polydopamine modified polypyrrole nanoparticles(PPy-PDA NPs).The PPy-PDA NPs could weaken the tough interaction between polymer chains and depress the Young’s modulus of the ionogel,thus promoting the ionogel ultrasoft(34 kPa)and highly stretchable(1,013%)performance to tensile deformations.In addition,the high photothermal conversion capacity of PPy-PDA NPs ensured the ionogel excellent NIR-light controlled adhesion and temperature sensitivity,which facilitated the ionogel on-demand removal and promised a reliable thermal sensor.Moreover,the resulted ultrasoft flexible sensor exhibited high sensitivity and stability to both strain and pressure in a broad range of deformations,enabling a precise monitoring on various human motions and physiological activities.The temperature-sensitive,ultrasoft,and controlled adhesive capabilities prompted great potential of the flexible ionogel in medical diagnosis and wearable electronics.展开更多
To identify the species in liquid surface using mass spectrometry,we must eliminate or reduce interferences during the vaporization or desorption of the species from the liquid surface.It is much more challenging to i...To identify the species in liquid surface using mass spectrometry,we must eliminate or reduce interferences during the vaporization or desorption of the species from the liquid surface.It is much more challenging to isolate the ionic,larger species from the liquid surface,because of the frangible structures and the higher solvation energies of those species.Here we demonstrate a new mass spectrometry in which the ionic species at the liquid surface can be desorbed with ultrasoft infrared picosecond laser pulses while the liquid surface is not breached.This laser desorption assisted mass spectrometry is not only a powerful tool to detect the fragile species but also promising to investigate vibrational energy transfer dynamics in the liquid surface.展开更多
Conductive polymer hydrogels have greatly improved the compatibility of electronic devices with biological tissues for human–machine interfacing.Hydrogels that possess low Young's modulus,low interfacial impedanc...Conductive polymer hydrogels have greatly improved the compatibility of electronic devices with biological tissues for human–machine interfacing.Hydrogels that possess low Young's modulus,low interfacial impedance,and high tensile properties facilitate high‐quality signal transmission across dynamic biointerfaces.Direct incorporation of elastomers with conductive polymers may result in undesirable mechanical and/or electrical performance.Here,a covalent cross‐linking network and an entanglement‐driven network with conductive poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)have been combined.The triple‐network conductive hydrogel shows high stretchability(with fracture strain up to 900%),low impedance(down to 91.2Ω·cm^(2)),and reversible adhesion.Importantly,ultra‐low modulus(down to 6.3 kPa)and strain‐insensitive electrical/electrochemical performance were achieved,which provides a guarantee for low current stimulation.The material design will contribute to the progression of soft and conformal bioelectronic devices,and pave the way to future implantable electronics.展开更多
基金supported by the National Key Research and Development Program of China(No.2020YFA0709900),the National Natural Science Foundation of China(No.61775089)the Natural Science Foundation of Shandong Province(No.ZR2020KB018)“Taishan scholars”construction special fund of Shandong Province.
文摘With the widespread prevailing of flexible electronics in human-machine interfaces,health monitor,and human motion detection,ultrasoft flexible sensors are urgently desired with critical demands in conformality.Herein,a temperature-sensitive ionogel with near-infrared(NIR)-light controlled adhesion is prepared by electrostatic interaction of poly(diallyl dimethylammonium chloride)(PDDA)and acrylic acid,as well as the incorporation of the conductive polydopamine modified polypyrrole nanoparticles(PPy-PDA NPs).The PPy-PDA NPs could weaken the tough interaction between polymer chains and depress the Young’s modulus of the ionogel,thus promoting the ionogel ultrasoft(34 kPa)and highly stretchable(1,013%)performance to tensile deformations.In addition,the high photothermal conversion capacity of PPy-PDA NPs ensured the ionogel excellent NIR-light controlled adhesion and temperature sensitivity,which facilitated the ionogel on-demand removal and promised a reliable thermal sensor.Moreover,the resulted ultrasoft flexible sensor exhibited high sensitivity and stability to both strain and pressure in a broad range of deformations,enabling a precise monitoring on various human motions and physiological activities.The temperature-sensitive,ultrasoft,and controlled adhesive capabilities prompted great potential of the flexible ionogel in medical diagnosis and wearable electronics.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB0450202).
文摘To identify the species in liquid surface using mass spectrometry,we must eliminate or reduce interferences during the vaporization or desorption of the species from the liquid surface.It is much more challenging to isolate the ionic,larger species from the liquid surface,because of the frangible structures and the higher solvation energies of those species.Here we demonstrate a new mass spectrometry in which the ionic species at the liquid surface can be desorbed with ultrasoft infrared picosecond laser pulses while the liquid surface is not breached.This laser desorption assisted mass spectrometry is not only a powerful tool to detect the fragile species but also promising to investigate vibrational energy transfer dynamics in the liquid surface.
基金Financial support by the National Key Research and Development Program of China(No.2022YFF1202902)the National Natural Science Foundation of China(Nos.52273192 and 52121002)the Haihe Laboratory of Sustainable Chemical Transformations are gratefully acknowledged.
文摘Conductive polymer hydrogels have greatly improved the compatibility of electronic devices with biological tissues for human–machine interfacing.Hydrogels that possess low Young's modulus,low interfacial impedance,and high tensile properties facilitate high‐quality signal transmission across dynamic biointerfaces.Direct incorporation of elastomers with conductive polymers may result in undesirable mechanical and/or electrical performance.Here,a covalent cross‐linking network and an entanglement‐driven network with conductive poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate(PEDOT:PSS)have been combined.The triple‐network conductive hydrogel shows high stretchability(with fracture strain up to 900%),low impedance(down to 91.2Ω·cm^(2)),and reversible adhesion.Importantly,ultra‐low modulus(down to 6.3 kPa)and strain‐insensitive electrical/electrochemical performance were achieved,which provides a guarantee for low current stimulation.The material design will contribute to the progression of soft and conformal bioelectronic devices,and pave the way to future implantable electronics.
