Stretchable strain sensors play an increasingly important role in artificial intelligent devices.However,high-performanee strain sensors havebeen slowly developed owing to the harsh requirement of self-powered functio...Stretchable strain sensors play an increasingly important role in artificial intelligent devices.However,high-performanee strain sensors havebeen slowly developed owing to the harsh requirement of self-powered function,long cycle life and high resolution.Here,we report aself-powered stretchable graphene-ecoflex composite strain sensor based on photo-thermoelectric(PTE)effect induced electricity.Thedevice exhibits a high strain sensitivity of-0.056 In(nA)/%with strains ranged from 0%to 20%under 980 nm light illumination,where thestrain sensitivity can be found to in crease with in creasi ng light inte nsity.The strain sensor maintains outstanding dyn amic stability un derperiodic strains ranged from 0 to 100%in 100 cycles.The sensing resolution can be as high as 0.5%with both the response and recovery timeof less than 0.6 s.It can precisely monitor human joint motions and stretchable strains by implanting the device in pork.展开更多
The development of artificial photosensitive synapses with high sensitivity and biomimetic properties that combine innovative concepts and neuromorphic architectures is crucial to achieving highly integrated and flexi...The development of artificial photosensitive synapses with high sensitivity and biomimetic properties that combine innovative concepts and neuromorphic architectures is crucial to achieving highly integrated and flexible intelligent visual systems.Recently,graphene heterostructure-based photosensitive synaptic transistors have been extensively studied for this purpose.However,compared to traditional transistors,vertical structure thin film transistors(VTFTs)with ultra-short channels and advantages,such as high integration,have yet to be investigated in photosensitive synapses.Here,we report an ultra-thin VTFT featuring a graphene/W_(x)Se_(x-1)van der Waals heterostructure that combines photonic and neuromorphic elements.We demonstrate a VTFT in which the channel layer is formed by covalently bonded W_(x)Se_(x-1)nanomaterials produced by introducing Se atoms on the surface of a tungsten metal thin film deposited via radio-frequency sputtering.This structure successfully simulated the main synaptic function,exhib-ited photosensitive synaptic responses to ultraviolet(λ=365 nm)light,and demonstrated highly reliable electrical performance.Furthermore,the incorporation of gold nanoparticles changed the photosensitive synaptic response properties of the graphene/W_(x)Se_(x-1)heterostructure from excitatory to inhibitory,show-ing a responsivity of about∼14 A W-1,which was attributed to the heterojunction interface resonant effects and efficient charge transfer induced by localized surface plasmons.This further enabled optical artificial synaptic applications while operating with low voltage spikes and low light intensity.This work provides a novel strategy for integrating and developing biological and nano-electronic systems.展开更多
An efficient pyrene-Schiff base fluorescent sensor PySb was synthesized and evaluated for its fluorescence response to metal ions. Sensor PySb exhibits an “off-on-type” mode with high selectivity to Zn2+ and Al3+ in...An efficient pyrene-Schiff base fluorescent sensor PySb was synthesized and evaluated for its fluorescence response to metal ions. Sensor PySb exhibits an “off-on-type” mode with high selectivity to Zn2+ and Al3+ in ethanol (470 nm) and in dimethyl sulfoxide (458 nm) respectively. The originally non-fluorescent PySb, due to photo-induced electron transfer (PET) from imine moiety, is turned on after binding with the cations. The stoichiometric ratio between PySb and Zn2+ is 1:2;moreover, the limit of detection (LOD) and bonding constant were 2.39 × 10-8 M and 2 × 109 M-1 respectively, as obtained from titration experiments.展开更多
Photovoltaic tracking sensor monitoring the position of the sun in the sky was developed on the basis of GeS:Sb layered crystals. The operating principle of this sensor is based on the phenomenon of photovoltaic effec...Photovoltaic tracking sensor monitoring the position of the sun in the sky was developed on the basis of GeS:Sb layered crystals. The operating principle of this sensor is based on the phenomenon of photovoltaic effect in GeS:Sb crystals;the magnitude and sign of generated photo-emf depend on the position of the light probe relative to the ohmic contacts, deposited on (001) surface of the crystal.展开更多
基金This work was supported by the National Key R&D Program of China(No.2016YFA0202701)the National Natural Science Foundation of China(No.51472055)+4 种基金External Cooperation Program of BIC,Chinese Academy of Sciences(No.121411KYS820150028)the 2015 Annual Beijing Talents Fund(No.2015000021223ZK32)Qingdao National Laboratory for Marine Science and Technology(No.2017ASKJ01)the University of Chinese Academy of Sciences(No.Y8540XX2D2)the"thousands talents"program for the pioneer researcher and his innovation team,China.
文摘Stretchable strain sensors play an increasingly important role in artificial intelligent devices.However,high-performanee strain sensors havebeen slowly developed owing to the harsh requirement of self-powered function,long cycle life and high resolution.Here,we report aself-powered stretchable graphene-ecoflex composite strain sensor based on photo-thermoelectric(PTE)effect induced electricity.Thedevice exhibits a high strain sensitivity of-0.056 In(nA)/%with strains ranged from 0%to 20%under 980 nm light illumination,where thestrain sensitivity can be found to in crease with in creasi ng light inte nsity.The strain sensor maintains outstanding dyn amic stability un derperiodic strains ranged from 0 to 100%in 100 cycles.The sensing resolution can be as high as 0.5%with both the response and recovery timeof less than 0.6 s.It can precisely monitor human joint motions and stretchable strains by implanting the device in pork.
基金supported by the National Research Foundation of Korea,funded by the Korean government(Nos.2016R1A3B1908249 and 2020R1A2C3013480).
文摘The development of artificial photosensitive synapses with high sensitivity and biomimetic properties that combine innovative concepts and neuromorphic architectures is crucial to achieving highly integrated and flexible intelligent visual systems.Recently,graphene heterostructure-based photosensitive synaptic transistors have been extensively studied for this purpose.However,compared to traditional transistors,vertical structure thin film transistors(VTFTs)with ultra-short channels and advantages,such as high integration,have yet to be investigated in photosensitive synapses.Here,we report an ultra-thin VTFT featuring a graphene/W_(x)Se_(x-1)van der Waals heterostructure that combines photonic and neuromorphic elements.We demonstrate a VTFT in which the channel layer is formed by covalently bonded W_(x)Se_(x-1)nanomaterials produced by introducing Se atoms on the surface of a tungsten metal thin film deposited via radio-frequency sputtering.This structure successfully simulated the main synaptic function,exhib-ited photosensitive synaptic responses to ultraviolet(λ=365 nm)light,and demonstrated highly reliable electrical performance.Furthermore,the incorporation of gold nanoparticles changed the photosensitive synaptic response properties of the graphene/W_(x)Se_(x-1)heterostructure from excitatory to inhibitory,show-ing a responsivity of about∼14 A W-1,which was attributed to the heterojunction interface resonant effects and efficient charge transfer induced by localized surface plasmons.This further enabled optical artificial synaptic applications while operating with low voltage spikes and low light intensity.This work provides a novel strategy for integrating and developing biological and nano-electronic systems.
文摘An efficient pyrene-Schiff base fluorescent sensor PySb was synthesized and evaluated for its fluorescence response to metal ions. Sensor PySb exhibits an “off-on-type” mode with high selectivity to Zn2+ and Al3+ in ethanol (470 nm) and in dimethyl sulfoxide (458 nm) respectively. The originally non-fluorescent PySb, due to photo-induced electron transfer (PET) from imine moiety, is turned on after binding with the cations. The stoichiometric ratio between PySb and Zn2+ is 1:2;moreover, the limit of detection (LOD) and bonding constant were 2.39 × 10-8 M and 2 × 109 M-1 respectively, as obtained from titration experiments.
文摘Photovoltaic tracking sensor monitoring the position of the sun in the sky was developed on the basis of GeS:Sb layered crystals. The operating principle of this sensor is based on the phenomenon of photovoltaic effect in GeS:Sb crystals;the magnitude and sign of generated photo-emf depend on the position of the light probe relative to the ohmic contacts, deposited on (001) surface of the crystal.
