Carbon nanodots(CDs)have emerged as a promising luminescent material,showing significant potential in biological imaging,information security,and illumination displays withintheinternet of things(loT).However,CDs-base...Carbon nanodots(CDs)have emerged as a promising luminescent material,showing significant potential in biological imaging,information security,and illumination displays withintheinternet of things(loT).However,CDs-based electroluminescent devices,especially flexible and self-powered white displays,remain scarcely reported,which limit their applications in human-machine interactions and wearable optoelectronics in the loT.Herein,we present a pioneering CDs-based flexible and self-powered white display system with a Commission Internationale de L'Eclairage(CIE)coordinate of(0.31,0.39)by integrating CDs-based alternating current electroluminescent(AcEL)devices with triboelectric nanogenerators.The CDs-based white ACEL devices can be dynamically modulated from light green to white under various supplied frequencies ranging from 50 to 500 Hz.The devices also render from cold white to warm white with correlated color temperature from 9705 to 4538 K,as the concentration ratios of ZnS:Cu phosphors to CDs change from 22:2 to 22:8.Furthermore,these devices exhibit excellent flexibility and stability,maintaining over 95%of their electroluminescent intensities after 4500 cycles even under a large bending angle of 180°with a bending radius of 4.9 mm.Finally,this CDs-based flexible and self-powered white display system is worn on the human body to realize real-time illumination display powered by biomechanical energy,such as hand slapping and walking.This work provides a novel design strategy toward high-performance CD-based flexible and self-powered white displays and expands their potential applications in wearable optoelectronics for the loT.展开更多
The effective acquisition of hydrogen energy from the ocean offers a promising sustainable solution for increasing global energy shortage.Herein,a self-powered high-efficient hydrogen generation system is proposed by ...The effective acquisition of hydrogen energy from the ocean offers a promising sustainable solution for increasing global energy shortage.Herein,a self-powered high-efficient hydrogen generation system is proposed by integrating a triboelectric–electromagnetic hybrid nanogenerator(TEHG),power management circuit(PMC),and an electrolytic cell.Under the wind triggering,as-fabricated TEHG can effectively convert breeze energy into electric energy,which demonstrates a high output current of 20.3 mA at a speed rotation of 700 rpm and the maximal output power of 13.8 mW at a load of 10 MΩ.Remarkably,asdesigned self-powered system can perform a steady and continuous water splitting to produce hydrogen(1.5μL·min^(−1))by adding a matching capacitor between the PMC and electrolytic cell.In the circuit,the capacitor can not only function as a charge compensation source for water splitting,but also stabilize the working voltage.Unlike other self-powered water splitting systems,the proposed system does not need catalysts or the complex electrical energy storage/release process,thus improving the hydrogen production efficiency and reducing the cost.This work provides an effective strategy for clean hydrogen energy production and demonstrates the huge potential of the constructed self-powered system toward carbon neutralization.展开更多
Physical unclonable functions(PUFs)offer a promising defensive measure against the escalating challenges posed by the increasingly rampant counterfeit products.Conventional PUF materials with a singular physical prope...Physical unclonable functions(PUFs)offer a promising defensive measure against the escalating challenges posed by the increasingly rampant counterfeit products.Conventional PUF materials with a singular physical property encounter limitations in encoding flexibility and capacity.Here,we propose a dual-color center diamond-based PUF(D-PUF)ink that exploits four diverse optical characteristics of dual-color center in diamond to design a concealable multi-level cryptographic authentication protocol.Through simple writing,stamping,or spraying,intricate covert random patterns can be directly generated on the objects,which are imperceptible under visible light.When challenged by a 532 nm laser,the D-PUF exhibits four distinct optical responses,including Raman,zero phonon line(ZPL)of germanium vacancies(GeV),ZPL of silicon vacancies(SiV),and the intensity ratios of these ZPLs.These responses were harvested simultaneously to construct the four-level separate encodable matrices.Furthermore,M-ary encoding algorithms were implemented to encrypt PUFs with flexibility.The resulting multi-level PUF system attains notable uniqueness,repeatability,extensive encoding capacity(>1048164/(100 pixels)2),and ultra-high information entropy(6 bits/pixel).This study inspires designing new generations of multi-level PUFs with enhanced coding flexibility and holds significant promise for applications in print security.展开更多
Self-powered display systems that integrate alternating current electroluminescence(ACEL)devices with triboelectric nanogenerators(TENGs)have shown great promise in human-machine interaction,smart displays,and securit...Self-powered display systems that integrate alternating current electroluminescence(ACEL)devices with triboelectric nanogenerators(TENGs)have shown great promise in human-machine interaction,smart displays,and security communications within the Internet of Things(IoT).However,their development has been significantly limited by undesirable flickering,which arises from the pulsed output characteristics of TENGs.Here,high-performance persistent phosphors((Ca_(0.25)Sr_(0.75))S:Eu)are incorporated into the ZnS:Cu-based ACEL devices to overcome this limitation,achieving an extended afterglow lifetime of 81 s and a sustained red emission lasting over 200 s.By integrating with TENGs,a self-powered persistent display system is realized that maintains bright red-emission for over 15 s.The varying afterglow intensities post power-off can distinguish directional movement(forward or backward),enabling motion trajectory recording and recognition,as demonstrated using floor-mounted TENGs to drive persistent display arrays.This strategy offers a new pathway for advanced self-powered display systems and broadens their application potential in the IoT landscape.展开更多
The quest for solar-blind photodetectors with outstanding optoelectronic properties and weak signals detection capability is essential for their applications in the field of imaging,communication,warning,etc.To date,G...The quest for solar-blind photodetectors with outstanding optoelectronic properties and weak signals detection capability is essential for their applications in the field of imaging,communication,warning,etc.To date,Ga_(2)O_(3)has demonstrated potential for high-performance solar-blind photodetectors.However,the performance usually decays superlinearly at low light intensities due to carrier-trapping effect,which limits the weak signal detection capability of Ga_(2)O_(3)photodetectors.Herein,a Ga_(2)O_(3)solarblind photodetector with ultra-thin absorbing medium has been designed to restrain trapping of photo-generated carriers during the transporting process by shortening the carrier transport distance.Meanwhile,multiple-beam interference is employed to enhance the absorption efficiency of the Ga_(2)O_(3)layer using an Al/Al_(2)O_(3)/Ga_(2)O_(3)structure.Based on the ultra-thin absorbing medium with enhanced absorption efficiency,a 7×7 flexible photodetector array is developed,and the detectivity can reach 1.7×10^(15)Jones,which is among the best values ever reported for Ga_(2)O_(3)photodetectors.Notably,the performance of the photodetector decays little as the illumination intensity is as weak as 5 nW/cm2,revealing the capacity to detect ultra-weak signals.In addition,the flexible photodetector array can execute the functions of imaging,spatial distribution of light source intensity,real-time light trajectory detection,etc.Our results may provide a route to high-performance solar-blind photodetectors for ultra-weak light detection.展开更多
Ultraviolet(UV)visualization has extensive applications in military and civil fields such as security monitoring,space communication,and wearable equipment for health monitoring in the internet of things(IoT).Due to t...Ultraviolet(UV)visualization has extensive applications in military and civil fields such as security monitoring,space communication,and wearable equipment for health monitoring in the internet of things(IoT).Due to their remarkable optoelectronic features,perovskite materials are regarded as promising candidates for UV light detecting and imaging.Herein,we report for the first time the excitationdependent perovskite/polymer films with dynamically tunable fluorescence ranging from green to magenta by changing the UV excitation from 260 to 380 nm.And they still render dynamic multicolor UV light imaging with different polymer matrixes,halogen ratios,and cations of perovskite materials.The mechanism of its fluorescence change is related to the chloride vacancies in perovskite materials.A patterned multi-color ultraviolet visualization pad is also demonstrated for visible conversion of the UV region.This technique may provide a universal strategy for information securities,UV visualizations,and dynamic multi-color displays in the IoT.展开更多
Advanced sustainable biomedical materials are urgently needed for clinical applications;however,developing biomedical materials with exceptional mechanical and bactericidal properties as well as removable functionalit...Advanced sustainable biomedical materials are urgently needed for clinical applications;however,developing biomedical materials with exceptional mechanical and bactericidal properties as well as removable functionalities to reduce unintended secondary injury remains a challenge.Here,we report a biomass-derived composite consisting of water-soluble fish gelatin(FG)and antibacterial ZnO@silk fibroin(ZSF)microspheres for potential application as the wound dressing.The ZSF microspheres are embedded in a FG matrix to realize the stretchable,antibacterial,and removable ZSF/FG composites.By introducing glycerin as the plasticizer,ZSF/FG composites deliver a tensile strength of 4.5 MPa and stretchability of 550%.Acting as both the germicide and hydrophile components,ZSF microspheres endow the composites with excellent antibacterial capacity and water solubility.To prevent secondary injury,the ZSF/FG composites can be easily removed from the wounds by simply exposing them to excess water.Additionally,the ZSF/FG composites exhibit favorable biocompatibility and sustain high cell viability of over 100%.The full-thickness skin wound model on infected mice demonstrated an efficient rate of wound closure and a reduced inflammatory response.The ZSF/FG composite shows promise to hasten the healing of infected wounds and is expected a promising candidate as wound dressing for clinical therapy.展开更多
基金This work is supported by the National Natural Science Foundation of China(Nos.U22A2077 and 11974317)China Postdoctoral Science Foundation(Nos.2023M733250 and GZC20232445)Henan Fundamental Research Leading Talent.
文摘Carbon nanodots(CDs)have emerged as a promising luminescent material,showing significant potential in biological imaging,information security,and illumination displays withintheinternet of things(loT).However,CDs-based electroluminescent devices,especially flexible and self-powered white displays,remain scarcely reported,which limit their applications in human-machine interactions and wearable optoelectronics in the loT.Herein,we present a pioneering CDs-based flexible and self-powered white display system with a Commission Internationale de L'Eclairage(CIE)coordinate of(0.31,0.39)by integrating CDs-based alternating current electroluminescent(AcEL)devices with triboelectric nanogenerators.The CDs-based white ACEL devices can be dynamically modulated from light green to white under various supplied frequencies ranging from 50 to 500 Hz.The devices also render from cold white to warm white with correlated color temperature from 9705 to 4538 K,as the concentration ratios of ZnS:Cu phosphors to CDs change from 22:2 to 22:8.Furthermore,these devices exhibit excellent flexibility and stability,maintaining over 95%of their electroluminescent intensities after 4500 cycles even under a large bending angle of 180°with a bending radius of 4.9 mm.Finally,this CDs-based flexible and self-powered white display system is worn on the human body to realize real-time illumination display powered by biomechanical energy,such as hand slapping and walking.This work provides a novel design strategy toward high-performance CD-based flexible and self-powered white displays and expands their potential applications in wearable optoelectronics for the loT.
基金supported by the National Natural Science Foundation of China(No.21805247).
文摘The effective acquisition of hydrogen energy from the ocean offers a promising sustainable solution for increasing global energy shortage.Herein,a self-powered high-efficient hydrogen generation system is proposed by integrating a triboelectric–electromagnetic hybrid nanogenerator(TEHG),power management circuit(PMC),and an electrolytic cell.Under the wind triggering,as-fabricated TEHG can effectively convert breeze energy into electric energy,which demonstrates a high output current of 20.3 mA at a speed rotation of 700 rpm and the maximal output power of 13.8 mW at a load of 10 MΩ.Remarkably,asdesigned self-powered system can perform a steady and continuous water splitting to produce hydrogen(1.5μL·min^(−1))by adding a matching capacitor between the PMC and electrolytic cell.In the circuit,the capacitor can not only function as a charge compensation source for water splitting,but also stabilize the working voltage.Unlike other self-powered water splitting systems,the proposed system does not need catalysts or the complex electrical energy storage/release process,thus improving the hydrogen production efficiency and reducing the cost.This work provides an effective strategy for clean hydrogen energy production and demonstrates the huge potential of the constructed self-powered system toward carbon neutralization.
基金the support of the National Key Research and Development Program of China(No.2022YFB3608604)the National Natural Science Foundation of China(Nos.U22A2077 and U21A2070)+5 种基金Shandong Provincial Natural Science Foundation(No.ZR2022MH280)Medical Science and Technology Project of Shandong Province(No.202307020692)Natural Science Foundation of Henan(Nos.212300410020 and 222300420297)Science and Technology Major Project of Henan Province(No.221100230300)the Fundamental Research Fund of Henan Academy of Sciences(No.20250627005)Henan Postdoctoral Foundation(No.202101007).
文摘Physical unclonable functions(PUFs)offer a promising defensive measure against the escalating challenges posed by the increasingly rampant counterfeit products.Conventional PUF materials with a singular physical property encounter limitations in encoding flexibility and capacity.Here,we propose a dual-color center diamond-based PUF(D-PUF)ink that exploits four diverse optical characteristics of dual-color center in diamond to design a concealable multi-level cryptographic authentication protocol.Through simple writing,stamping,or spraying,intricate covert random patterns can be directly generated on the objects,which are imperceptible under visible light.When challenged by a 532 nm laser,the D-PUF exhibits four distinct optical responses,including Raman,zero phonon line(ZPL)of germanium vacancies(GeV),ZPL of silicon vacancies(SiV),and the intensity ratios of these ZPLs.These responses were harvested simultaneously to construct the four-level separate encodable matrices.Furthermore,M-ary encoding algorithms were implemented to encrypt PUFs with flexibility.The resulting multi-level PUF system attains notable uniqueness,repeatability,extensive encoding capacity(>1048164/(100 pixels)2),and ultra-high information entropy(6 bits/pixel).This study inspires designing new generations of multi-level PUFs with enhanced coding flexibility and holds significant promise for applications in print security.
基金the support of the National Natural Science Foundation of China(Nos.U22A2077,12404465,U21A2070,and 62027816)Natural Science Foundation of Henan(No.212300410020)+1 种基金Science and Technology Major Project of Henan Province(No.221100230300)China Postdoctoral Science Foundation(Nos.2023M733250 and GZC20232445).
文摘Self-powered display systems that integrate alternating current electroluminescence(ACEL)devices with triboelectric nanogenerators(TENGs)have shown great promise in human-machine interaction,smart displays,and security communications within the Internet of Things(IoT).However,their development has been significantly limited by undesirable flickering,which arises from the pulsed output characteristics of TENGs.Here,high-performance persistent phosphors((Ca_(0.25)Sr_(0.75))S:Eu)are incorporated into the ZnS:Cu-based ACEL devices to overcome this limitation,achieving an extended afterglow lifetime of 81 s and a sustained red emission lasting over 200 s.By integrating with TENGs,a self-powered persistent display system is realized that maintains bright red-emission for over 15 s.The varying afterglow intensities post power-off can distinguish directional movement(forward or backward),enabling motion trajectory recording and recognition,as demonstrated using floor-mounted TENGs to drive persistent display arrays.This strategy offers a new pathway for advanced self-powered display systems and broadens their application potential in the IoT landscape.
基金This work was financially supported by the National Key Research and Development Program of China(No.2018YFB0406500)the National Natural Science Foundation of China(Nos.61804136,U1804155,and 62027816)China Postdoctoral Science Foundation(Nos.2018M630829 and 2019T120630).
文摘The quest for solar-blind photodetectors with outstanding optoelectronic properties and weak signals detection capability is essential for their applications in the field of imaging,communication,warning,etc.To date,Ga_(2)O_(3)has demonstrated potential for high-performance solar-blind photodetectors.However,the performance usually decays superlinearly at low light intensities due to carrier-trapping effect,which limits the weak signal detection capability of Ga_(2)O_(3)photodetectors.Herein,a Ga_(2)O_(3)solarblind photodetector with ultra-thin absorbing medium has been designed to restrain trapping of photo-generated carriers during the transporting process by shortening the carrier transport distance.Meanwhile,multiple-beam interference is employed to enhance the absorption efficiency of the Ga_(2)O_(3)layer using an Al/Al_(2)O_(3)/Ga_(2)O_(3)structure.Based on the ultra-thin absorbing medium with enhanced absorption efficiency,a 7×7 flexible photodetector array is developed,and the detectivity can reach 1.7×10^(15)Jones,which is among the best values ever reported for Ga_(2)O_(3)photodetectors.Notably,the performance of the photodetector decays little as the illumination intensity is as weak as 5 nW/cm2,revealing the capacity to detect ultra-weak signals.In addition,the flexible photodetector array can execute the functions of imaging,spatial distribution of light source intensity,real-time light trajectory detection,etc.Our results may provide a route to high-performance solar-blind photodetectors for ultra-weak light detection.
基金supported by the National Natural Science Foundation of China(52125205,11974317,11674290,U20A20166,U1704138,52192614,61805015,and 61804011)the National Key R&D Program of China(2021YFB3200302 and 2021YFB3200304)+5 种基金Natural Science Foundation of Beijing Municipality(Z180011 and 2222088)Shenzhen Science and Technology Program(KQTD20170810105439418)the Fundamental Research Funds for the Central UniversitiesHenan Science Fund for Distinguished Young Scholars(212300410020)Key Project of Henan Higher Education(21A140001)the Zhengzhou University Physics Discipline Improvement Program。
文摘Ultraviolet(UV)visualization has extensive applications in military and civil fields such as security monitoring,space communication,and wearable equipment for health monitoring in the internet of things(IoT).Due to their remarkable optoelectronic features,perovskite materials are regarded as promising candidates for UV light detecting and imaging.Herein,we report for the first time the excitationdependent perovskite/polymer films with dynamically tunable fluorescence ranging from green to magenta by changing the UV excitation from 260 to 380 nm.And they still render dynamic multicolor UV light imaging with different polymer matrixes,halogen ratios,and cations of perovskite materials.The mechanism of its fluorescence change is related to the chloride vacancies in perovskite materials.A patterned multi-color ultraviolet visualization pad is also demonstrated for visible conversion of the UV region.This technique may provide a universal strategy for information securities,UV visualizations,and dynamic multi-color displays in the IoT.
基金Henan Science Fund for Distinguished Young Scholars,Grant/Award Number:212300410020National Natural Science Foundation of China,Grant/Award Numbers:U22A2077,11974317Natural Science Foundation of Shandong Province,Grant/Award Number:ZR2022MH280。
文摘Advanced sustainable biomedical materials are urgently needed for clinical applications;however,developing biomedical materials with exceptional mechanical and bactericidal properties as well as removable functionalities to reduce unintended secondary injury remains a challenge.Here,we report a biomass-derived composite consisting of water-soluble fish gelatin(FG)and antibacterial ZnO@silk fibroin(ZSF)microspheres for potential application as the wound dressing.The ZSF microspheres are embedded in a FG matrix to realize the stretchable,antibacterial,and removable ZSF/FG composites.By introducing glycerin as the plasticizer,ZSF/FG composites deliver a tensile strength of 4.5 MPa and stretchability of 550%.Acting as both the germicide and hydrophile components,ZSF microspheres endow the composites with excellent antibacterial capacity and water solubility.To prevent secondary injury,the ZSF/FG composites can be easily removed from the wounds by simply exposing them to excess water.Additionally,the ZSF/FG composites exhibit favorable biocompatibility and sustain high cell viability of over 100%.The full-thickness skin wound model on infected mice demonstrated an efficient rate of wound closure and a reduced inflammatory response.The ZSF/FG composite shows promise to hasten the healing of infected wounds and is expected a promising candidate as wound dressing for clinical therapy.
