Skin-like electronics research aiming to mimic even surpass human-like specific tactile cognition by operating perception-to-cognition-to-feedback of stimulus to build intelligent cognition systems for certain imperce...Skin-like electronics research aiming to mimic even surpass human-like specific tactile cognition by operating perception-to-cognition-to-feedback of stimulus to build intelligent cognition systems for certain imperceptible or inappreciable signals was so attractive.Herein,we constructed an all-in-one tri-modal pressure sensing wearable device to address the issue of power supply by integrating multistage microstructured ionic skin(MM i-skin)and thermoelectric self-power staffs,which exhibits high sensitivity simultaneously.The MM i-skin with multi-stage“interlocked”configurations achieved precise recognition of subtle signals,where the sensitivity reached up to 3.95 kPa^(−1),as well as response time of 46 ms,cyclic stability(over 1500 cycles),a wide detection range of 0–200 kPa.Furthermore,we developed the thermoelectricity nanogenerator,piezoelectricity nanogenerator,and piezocapacitive sensing as an integrated tri-modal pressure sensing,denoted as P-iskin,T-iskin,and C-iskin,respectively.This multifunctional ionic skin enables real-time monitoring of weak body signals,rehab guidance,and robotic motion recognition,demonstrating potential for Internet of things(IoT)applications involving the artificial intelligence-motivated sapiential healthcare Internet(SHI)and widely distributed human-machine interaction(HMI).展开更多
To meet challenges of the global energy crisis and the freshwater resources shortage,the interfacial solarto-steam conversion(ISSC)system was developed quickly in recent years.The photothermal materials play an import...To meet challenges of the global energy crisis and the freshwater resources shortage,the interfacial solarto-steam conversion(ISSC)system was developed quickly in recent years.The photothermal materials play an important role in the ISSC system.We are devoted to developing a unique photothermal material integrating multiple 3 D design philosophy both at macroscopic and microscopic levels by employing the cost-effective and widespread resources like straw,rose and coffee grounds,for carbonization as solar absorbers.The biomass-based carbonized particles(CPs)possess three major advantages:(1)wide sizedistribution is accessible to form 3 D porous rough surface of absorber layer to enhance ability of light absorption;(2)the pristine hierarchical microstructure could absorb nearly all the incident light;(3)the intrinsic vascular bundles with pores on their lumen walls provide a rapid and omnidirectional transport for water and steam escape.A high-efficient solar steam device was fabricated based on the absorber material with its internal 3 D micro textures and external 3 D architectures.Under the illumination of 1 sun,the photothermal conversion efficiency of straw,rose and coffee CPs can reach 93.4%,92.8% and 76%,respectively.Simultaneously,a high-efficient solar thermoelectric generator(STEG)is made by coating CPs on a commercial thermoelectric generator and the maximum power of STEG can reach 538.0μW.Such scalable biomass-based photothermal materials and high-grade thermoelectric conversion capability could be applied to the water purification and the electricity production.展开更多
A bimodal coupled multifunctional tactile perceptron for contactless gesture recognition and material identification is pro-posed to address the challenges posed by limited functionality,signal interference from multi...A bimodal coupled multifunctional tactile perceptron for contactless gesture recognition and material identification is pro-posed to address the challenges posed by limited functionality,signal interference from multimodal collaborative work,and the high power consumption of traditional tactile sensors.This perceptron integrates a capacitive sensor and a triboelectric sensor symmetrically,employing an energy complementarity strategy to reduce power consumption and implementing symmetrical distribution of two sensors for physical isolation to prevent signal interference.The capacitive sensor detects external pressure,providing information on material properties such as hardness,softness,and deformation,with a wide linear response range of 0-745.3 kPa.The triboelectric sensor captures the electron affinity of measured object.Further,by utilising machine learning algorithms,a system for contactless gesture recognition and material identification is engineered.This system demonstrates a remarkable accuracy rate of 98.5%when recognising 5 gestures,and achieves a perfect identi-fication(100%)of 10 different materials aided by incorporating capacitive and triboelectric response.These results greatly advance the progress of tactile perceptrons with high integration,low power consumption,and multifunctionality,enhancing their effectiveness and reliability in smart device applications.展开更多
Silver nanoparticles(Ag NPs),relative to existing antibacterial agents,are more effective,less toxic and more economical,and have shown enormous potential for the nanomedicine application.In this work,we report a‘gr...Silver nanoparticles(Ag NPs),relative to existing antibacterial agents,are more effective,less toxic and more economical,and have shown enormous potential for the nanomedicine application.In this work,we report a‘green’method for the rapid and efficient synthesis of Ag NPs using Ginkgo biloba extracts as reducing agent and capping agent.The properties of Ag NPs against fungi and bacteria were investigated.The results showed that the Ginkgo biloba extracts are crucial for the preparation of uniform and monodispersed Ag NPs.The prepared Ag NPs exhibited remarkable antibacterial activities.The minimum inhibitory concentrations of Ag NPs for Escherichia coli and Pseudomonas aeruginosa were 0.044 and 0.088μg·mL−1,respectively.Moreover,Ag NPs exhibited excellent bactericidal performance against MDR-Pseudomonas aeruginosa.It was found that the effect of the antibacterial activity of Ag NPs on Escherichia coli and Staphylococcus aureus was tightly related to the reactive oxygen species accumulation.This research provides guidelines for the efficient green synthesis of Ag NPs and its antibacterial applications.展开更多
A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is syn-thesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtaine...A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is syn-thesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed： the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.展开更多
基金supported by the National Natural Science Foundation of China(No.52271241 and 52071282)the Applied Basic Research Key Project of Yunnan(202001BB050046)the National Training Programs of Innovation and Entrepreneurship for Undergraduates(No.202210673068 and 202210673002).
文摘Skin-like electronics research aiming to mimic even surpass human-like specific tactile cognition by operating perception-to-cognition-to-feedback of stimulus to build intelligent cognition systems for certain imperceptible or inappreciable signals was so attractive.Herein,we constructed an all-in-one tri-modal pressure sensing wearable device to address the issue of power supply by integrating multistage microstructured ionic skin(MM i-skin)and thermoelectric self-power staffs,which exhibits high sensitivity simultaneously.The MM i-skin with multi-stage“interlocked”configurations achieved precise recognition of subtle signals,where the sensitivity reached up to 3.95 kPa^(−1),as well as response time of 46 ms,cyclic stability(over 1500 cycles),a wide detection range of 0–200 kPa.Furthermore,we developed the thermoelectricity nanogenerator,piezoelectricity nanogenerator,and piezocapacitive sensing as an integrated tri-modal pressure sensing,denoted as P-iskin,T-iskin,and C-iskin,respectively.This multifunctional ionic skin enables real-time monitoring of weak body signals,rehab guidance,and robotic motion recognition,demonstrating potential for Internet of things(IoT)applications involving the artificial intelligence-motivated sapiential healthcare Internet(SHI)and widely distributed human-machine interaction(HMI).
基金financially supported by the National Science Foundation of China(Nos.51771170 and 51701177)the Yunnan Applied Basic Research Project(Nos.2017FB080 and 2018FB090)the joint fund of Yunnan University and Science&Technology Department of Yunnan Province(No.2019FY003013)。
文摘To meet challenges of the global energy crisis and the freshwater resources shortage,the interfacial solarto-steam conversion(ISSC)system was developed quickly in recent years.The photothermal materials play an important role in the ISSC system.We are devoted to developing a unique photothermal material integrating multiple 3 D design philosophy both at macroscopic and microscopic levels by employing the cost-effective and widespread resources like straw,rose and coffee grounds,for carbonization as solar absorbers.The biomass-based carbonized particles(CPs)possess three major advantages:(1)wide sizedistribution is accessible to form 3 D porous rough surface of absorber layer to enhance ability of light absorption;(2)the pristine hierarchical microstructure could absorb nearly all the incident light;(3)the intrinsic vascular bundles with pores on their lumen walls provide a rapid and omnidirectional transport for water and steam escape.A high-efficient solar steam device was fabricated based on the absorber material with its internal 3 D micro textures and external 3 D architectures.Under the illumination of 1 sun,the photothermal conversion efficiency of straw,rose and coffee CPs can reach 93.4%,92.8% and 76%,respectively.Simultaneously,a high-efficient solar thermoelectric generator(STEG)is made by coating CPs on a commercial thermoelectric generator and the maximum power of STEG can reach 538.0μW.Such scalable biomass-based photothermal materials and high-grade thermoelectric conversion capability could be applied to the water purification and the electricity production.
基金financially supported by the National Natural Science Foundation of China(No.52271241 and 52071282)the Applied Basic Research Key Project of Yunnan(202001BB050046)+1 种基金the Scientific Research Fund of Education Department of Yunnan Province(No.2024Y041)the National Training Programs of Innovation and Entrepreneurship for Undergraduates(No.202210673002 and 202307004).
文摘A bimodal coupled multifunctional tactile perceptron for contactless gesture recognition and material identification is pro-posed to address the challenges posed by limited functionality,signal interference from multimodal collaborative work,and the high power consumption of traditional tactile sensors.This perceptron integrates a capacitive sensor and a triboelectric sensor symmetrically,employing an energy complementarity strategy to reduce power consumption and implementing symmetrical distribution of two sensors for physical isolation to prevent signal interference.The capacitive sensor detects external pressure,providing information on material properties such as hardness,softness,and deformation,with a wide linear response range of 0-745.3 kPa.The triboelectric sensor captures the electron affinity of measured object.Further,by utilising machine learning algorithms,a system for contactless gesture recognition and material identification is engineered.This system demonstrates a remarkable accuracy rate of 98.5%when recognising 5 gestures,and achieves a perfect identi-fication(100%)of 10 different materials aided by incorporating capacitive and triboelectric response.These results greatly advance the progress of tactile perceptrons with high integration,low power consumption,and multifunctionality,enhancing their effectiveness and reliability in smart device applications.
基金supports by the National Natural Science Foundation of China(Grant Nos.51871196 and 81960322)the Yunnan Fundamental Research Projects(Grant No.202001BB050046)+2 种基金the Major Science and Technology Project of Precious Metal Materials Genetic Engineering in Yunnan Province(Grant No.202002AB080001)the joint fund of Yunman University and Science&Technology Depatment of Y unnan Provinee(Grant No.2019FY003013)the Medical Reserve Personnel Training Program of Yunman Prorincial Health Comision(Grant No.H-2018097).
文摘Silver nanoparticles(Ag NPs),relative to existing antibacterial agents,are more effective,less toxic and more economical,and have shown enormous potential for the nanomedicine application.In this work,we report a‘green’method for the rapid and efficient synthesis of Ag NPs using Ginkgo biloba extracts as reducing agent and capping agent.The properties of Ag NPs against fungi and bacteria were investigated.The results showed that the Ginkgo biloba extracts are crucial for the preparation of uniform and monodispersed Ag NPs.The prepared Ag NPs exhibited remarkable antibacterial activities.The minimum inhibitory concentrations of Ag NPs for Escherichia coli and Pseudomonas aeruginosa were 0.044 and 0.088μg·mL−1,respectively.Moreover,Ag NPs exhibited excellent bactericidal performance against MDR-Pseudomonas aeruginosa.It was found that the effect of the antibacterial activity of Ag NPs on Escherichia coli and Staphylococcus aureus was tightly related to the reactive oxygen species accumulation.This research provides guidelines for the efficient green synthesis of Ag NPs and its antibacterial applications.
文摘A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is syn-thesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed： the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.
