Self-powered flexible devices with skin-like multiple sensing ability have attracted great attentions due to their broad applications in the Internet of Things(IoT).Various methods have been proposed to enhance mechan...Self-powered flexible devices with skin-like multiple sensing ability have attracted great attentions due to their broad applications in the Internet of Things(IoT).Various methods have been proposed to enhance mechano-optic or electric performance of the flexible devices;however,it remains challenging to realize the display and accurate recognition of motion trajectories for intelligent control.Here,we present a fully self-powered mechanoluminescent-triboelectric bimodal sensor based on micronanostructured mechanoluminescent elastomer,which can patterned-display the force trajectories.The deformable liquid metals used as stretchable electrode make the stress transfer stable through overall device to achieve outstanding mechanoluminescence(with a gray value of 107 under a stimulus force as low as 0.3 N and more than 2000 cycles reproducibility).Moreover,a microstructured surface is constructed which endows the resulted composite with significantly improved triboelectric performances(voltage increases from 8 to 24 V).Based on the excellent bimodal sensing performances and durability of the obtained composite,a highly reliable intelligent control system by machine learning has been developed for controlling trolley,providing an approach for advanced visual interaction devices and smart wearable electronics in the future IoT era.展开更多
Chemical reduction of graphene oxide(GO)often requires harsh conditions and introduces structural defects,limiting its application in photothermal-driven oil spill remediation.Herein,we report a novel plasmon-driven p...Chemical reduction of graphene oxide(GO)often requires harsh conditions and introduces structural defects,limiting its application in photothermal-driven oil spill remediation.Herein,we report a novel plasmon-driven photochemical reduction strategy using silver nanoparticles(Ag NPs)to achieve defect healing and efficient reduction of GO under solar irradiation at room temperature.The localized surface plasmon resonance(LSPR)of Ag NPs not only promotes the deoxygenation of GO to form a superhydrophobic surface but also repairs the conjugated structure of GO via hot electron transfer,reducing its defect density by 21%.The resulting Ag NPs@rGO composite exhibits strong solar-spectrum absorption(93.8%)and high photo-thermal conversion efficiency(89.7%).When coated on a polyurethane(PU)sponge,the material rapidly heats to 81℃ within 60 s under 1 sun irradiation,significantly reducing the viscosity of crude oil and achieving an adsorption capacity of 47.2 g/g,six times higher than that of conventional carbon-based sponges.Remarkably,the sponge maintains stable adsorption performance over 36 absorption-desorption cycles and demonstrates exceptional chemical/mechanical durability.This study provides an eco-friendly approach for fabricating high-quality rGO and highlights its potential for sustainable environmental remediation material.展开更多
In the context of the gradual popularity of electric vehicles(EVs),the development of lithium battery systems with high energy density and power density is regarded as the foremost way to improve the range of EVs.LiNi...In the context of the gradual popularity of electric vehicles(EVs),the development of lithium battery systems with high energy density and power density is regarded as the foremost way to improve the range of EVs.LiNi_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)cathodes have been the focus of researchers due to their high energy density,excellent power performance,and low-temperature resistance.However,the elaboration of the decay mechanism of NCM cathode based on lithium metal batteries(LMBs)is still being restricted to the primary level.In the past decades,the development and application of advanced in-situ characterization tools have facilitated researchers'understanding of the internal operation mechanism of batteries during charging and discharging.In this minireview,the latest progress of in-situ observation of the NCM cathode by X-ray diffraction(XRD),fourier transform infrared(FT-IR)spectroscopy,Raman spectroscopy,atomic force microscopy(AFM),transmission electron microscope(TEM),optical microscope,and other characterization tools is summarized.The mechanisms of structural degradation,cathode-electrolyte interfaces(CEIs)composition,and dynamic changes of NCM,electrolyte breakdown,and gas production are elaborated.Finally,based on the existing research progress,the opportunities and challenges for future in-situ characterization technology in the study of the mechanism of LMBs are discussed in depth.Therefore,the purpose of this minireview is to summarize recent work that focuses on the outstanding application of in-situ characterization techniques in the mechanistic study of LMBs,and pointing the way to the future development of high energy density and power density LMBs systems.展开更多
Aiming for suppressing side-mode and spectrum broadening,a slit beam-shaping method and super-Gaussian apodization processing for femtosecond laser point-by-point(PbP)inscription technology of fiber Bragg gratings(FBG...Aiming for suppressing side-mode and spectrum broadening,a slit beam-shaping method and super-Gaussian apodization processing for femtosecond laser point-by-point(PbP)inscription technology of fiber Bragg gratings(FBGs)are reported here.High-quality FBGs,featuring narrow bandwidth of less than 0.3 nm,high reflectivity above 85%,low insertion loss(0.21 dB),and low cladding loss(0.82 dB),were obtained successfully.By a semi-automatic PbP inscription process,an array consisting of six FBGs,exhibiting almost no side-mode peaks with high suppression ability and narrow bandwidth,was fabricated along three independently developed single-mode fibers with an interval of 20 mm.展开更多
基金the National Natural Science Foundation of China(52173112 and 51873123)Sichuan Provincial Natural Science Fund for Distinguished Young Scholars(2021JDJQ0017)the Program for Featured Directions of Engineering Multidisciplines of Sichuan University(No:2020SCUNG203)for financial support。
文摘Self-powered flexible devices with skin-like multiple sensing ability have attracted great attentions due to their broad applications in the Internet of Things(IoT).Various methods have been proposed to enhance mechano-optic or electric performance of the flexible devices;however,it remains challenging to realize the display and accurate recognition of motion trajectories for intelligent control.Here,we present a fully self-powered mechanoluminescent-triboelectric bimodal sensor based on micronanostructured mechanoluminescent elastomer,which can patterned-display the force trajectories.The deformable liquid metals used as stretchable electrode make the stress transfer stable through overall device to achieve outstanding mechanoluminescence(with a gray value of 107 under a stimulus force as low as 0.3 N and more than 2000 cycles reproducibility).Moreover,a microstructured surface is constructed which endows the resulted composite with significantly improved triboelectric performances(voltage increases from 8 to 24 V).Based on the excellent bimodal sensing performances and durability of the obtained composite,a highly reliable intelligent control system by machine learning has been developed for controlling trolley,providing an approach for advanced visual interaction devices and smart wearable electronics in the future IoT era.
基金supported by the Sichuan Science and Technology Program(2022JDJQ0020)the National Natural Science Foundation of China(51973245,22076153)the Analytical and Testing Center of Southwest Jiaotong University.
文摘Chemical reduction of graphene oxide(GO)often requires harsh conditions and introduces structural defects,limiting its application in photothermal-driven oil spill remediation.Herein,we report a novel plasmon-driven photochemical reduction strategy using silver nanoparticles(Ag NPs)to achieve defect healing and efficient reduction of GO under solar irradiation at room temperature.The localized surface plasmon resonance(LSPR)of Ag NPs not only promotes the deoxygenation of GO to form a superhydrophobic surface but also repairs the conjugated structure of GO via hot electron transfer,reducing its defect density by 21%.The resulting Ag NPs@rGO composite exhibits strong solar-spectrum absorption(93.8%)and high photo-thermal conversion efficiency(89.7%).When coated on a polyurethane(PU)sponge,the material rapidly heats to 81℃ within 60 s under 1 sun irradiation,significantly reducing the viscosity of crude oil and achieving an adsorption capacity of 47.2 g/g,six times higher than that of conventional carbon-based sponges.Remarkably,the sponge maintains stable adsorption performance over 36 absorption-desorption cycles and demonstrates exceptional chemical/mechanical durability.This study provides an eco-friendly approach for fabricating high-quality rGO and highlights its potential for sustainable environmental remediation material.
基金supports by the National Natural Science Foundation of China(Nos.U20A2072,52072352,and 21875226)the Foundation for the Youth S&T Innovation Team of Sichuan Province(No.2020JDTD0035)Tianfu Rencai Plan.
文摘In the context of the gradual popularity of electric vehicles(EVs),the development of lithium battery systems with high energy density and power density is regarded as the foremost way to improve the range of EVs.LiNi_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)cathodes have been the focus of researchers due to their high energy density,excellent power performance,and low-temperature resistance.However,the elaboration of the decay mechanism of NCM cathode based on lithium metal batteries(LMBs)is still being restricted to the primary level.In the past decades,the development and application of advanced in-situ characterization tools have facilitated researchers'understanding of the internal operation mechanism of batteries during charging and discharging.In this minireview,the latest progress of in-situ observation of the NCM cathode by X-ray diffraction(XRD),fourier transform infrared(FT-IR)spectroscopy,Raman spectroscopy,atomic force microscopy(AFM),transmission electron microscope(TEM),optical microscope,and other characterization tools is summarized.The mechanisms of structural degradation,cathode-electrolyte interfaces(CEIs)composition,and dynamic changes of NCM,electrolyte breakdown,and gas production are elaborated.Finally,based on the existing research progress,the opportunities and challenges for future in-situ characterization technology in the study of the mechanism of LMBs are discussed in depth.Therefore,the purpose of this minireview is to summarize recent work that focuses on the outstanding application of in-situ characterization techniques in the mechanistic study of LMBs,and pointing the way to the future development of high energy density and power density LMBs systems.
基金supported by the Sichuan Provincial Natural Science Foundation(No.23NSFSC4751)。
文摘Aiming for suppressing side-mode and spectrum broadening,a slit beam-shaping method and super-Gaussian apodization processing for femtosecond laser point-by-point(PbP)inscription technology of fiber Bragg gratings(FBGs)are reported here.High-quality FBGs,featuring narrow bandwidth of less than 0.3 nm,high reflectivity above 85%,low insertion loss(0.21 dB),and low cladding loss(0.82 dB),were obtained successfully.By a semi-automatic PbP inscription process,an array consisting of six FBGs,exhibiting almost no side-mode peaks with high suppression ability and narrow bandwidth,was fabricated along three independently developed single-mode fibers with an interval of 20 mm.
