Current aqueous battery electrolytes,including conve ntional hydrogel electrolytes,exhibit unsatisfactory water retention capabilities.The sustained water loss will lead to subsequent polarization and increased intern...Current aqueous battery electrolytes,including conve ntional hydrogel electrolytes,exhibit unsatisfactory water retention capabilities.The sustained water loss will lead to subsequent polarization and increased internal resistance,ultimately resulting in battery failure.Herein,a double network(DN) orga no hydrogel electrolyte based on dimethyl sulfoxide(DMSO)/H_(2)O binary solvent was proposed.Through directionally reconstructing hydrogen bonds and reducing active H_(2)O molecules,the water retention ability and cathode/anode interfaces were synergistic enhanced.As a result,the synthesized DN organohydrogel demonstrates exceptional water retention capabilities,retaining approximately 75% of its original weight even after the exposure to air for 20 days.The Zn MnO_(2) battery delivers an outstanding specific capacity of275 mA h g^(-1) at 1 C,impressive rate performance with 85 mA h g^(-1) at 30 C,and excellent cyclic stability(95% retention after 6000 cycles at 5 C).Zn‖Zn symmetric battery can cycle more than 5000 h at 1 mA cm^(-2) and 1 mA h cm^(-2) without short circuiting.This study will encourage the further development of functional organohydrogel electrolytes for advanced energy storage devices.展开更多
Thermal conduetances between Cu and graphene covered carbon nanotubes （gCNTs） are calculated by molecular dynamics simulations. The results show that the thermal conductance is about ten times larger than that of Cu...Thermal conduetances between Cu and graphene covered carbon nanotubes （gCNTs） are calculated by molecular dynamics simulations. The results show that the thermal conductance is about ten times larger than that of Cu- CNT interface. The enhanced thermal conductance is due to the larger contact area introduced by the graphene layer and the stronger thermal transfer ability of the Cu-gCNT interface. From the linear increasing thermal conductance with the increasing total contact area, an effective contact area of such an interface can be defined.展开更多
Resistive switching random access memory(RRAM) is considered as one of the potential candidates for next-generation memory. However, obtaining an RRAM device with comprehensively excellent performance, such as high re...Resistive switching random access memory(RRAM) is considered as one of the potential candidates for next-generation memory. However, obtaining an RRAM device with comprehensively excellent performance, such as high retention and endurance, low variations, as well as CMOS compatibility, etc., is still an open question. In this work, we introduce an insert TaO_(x) layer into HfO_(x)-based RRAM to optimize the device performance. Attributing to robust filament formed in the TaO_(x) layer by a forming operation, the local-field and thermal enhanced effect and interface modulation has been implemented simultaneously. Consequently, the RRAM device features large windows(> 10^(3)), fast switching speed(-10 ns), steady retention(> 72h), high endurance(> 10^(8) cycles), and excellent uniformity of both cycle-to-cycle and device-to-device. These results indicate that inserting the TaO_(x) layer can significantly improve HfO_(x)-based device performance, providing a constructive approach for the practical application of RRAM.展开更多
Human skin exhibits extreme sensitivity to spatiotemporal contact events,especially important for dynamic interactions in human-machine interfaces.However,replicating non-invasive haptic feedback for dynamic interacti...Human skin exhibits extreme sensitivity to spatiotemporal contact events,especially important for dynamic interactions in human-machine interfaces.However,replicating non-invasive haptic feedback for dynamic interaction with a spatiotemporal resolution that matches the human somatosensory system remains challenging because the spatiotemporal design criteria of the haptic interface and the perception characteristic of human beings are not clearly understood.Here,we report a thin electrostatic-enhanced vibro-haptic interface constructed with piezoelectric actuator pixels driven by relativity low voltage,capable of being spatiotemporally programmed for wearable and noninvasive dynamic haptic interaction.Systematic psychophysical tests systematically reveal the relationship between the spatiotemporal parameters(duration,interval,delay,and two-point distance)and human perception characteristics(intensity,continuity,and pixel asynchronous activation perceptibility).Accordingly,wearable haptic music is designed to reproduce the smooth rhythmic beats on a finger(distinguishing accuracy of 95%).Moreover,we demonstrate the reproduction of virtual dynamic interactions,such as recognizing moving directions,textures,and action modes.This work provides clear criteria for designing vibro-haptic interfaces with high spatiotemporal resolution for both physical and virtual applications.展开更多
Atomic characterization on tetragonal FeAs layer and engineering FeAs superlattices is highly desirable to get deep insight into the multi-band superconductivity in iron-pnictides.We fabricate the tetragonal FeAs laye...Atomic characterization on tetragonal FeAs layer and engineering FeAs superlattices is highly desirable to get deep insight into the multi-band superconductivity in iron-pnictides.We fabricate the tetragonal FeAs layer by topotactic reaction of FeTe films with arsenic and then obtain KxFe_(2)As_(2)upon potassium intercalation using molecular beam epitaxy.The in-situ low-temperature√2×√2scanning tunneling microscopy/spectroscopy investigations demonstrate characteristic reconstruction of the FeAs layer and stripe pattern of KxFe_(2)As_(2),accompanied by the development of a superconducting-like gap.The ex-situ transport measurement with FeTe capping layers shows a superconducting transition with an onset temperature of 10 K.This work provides a promising way to characterize the FeAs layer directly and explore rich emergent physics with epitaxial superlattice design.展开更多
基金Joint Funds of the National Natural Science Foundation of China (U22A20140)University of Jinan Disciplinary Cross-Convergence Construction Project 2023 (XKJC-202309, XKJC-202307)+4 种基金Jinan City-School Integration Development Strategy Project (JNSX2023015)Independent Cultivation Program of Innovation Team of Ji’nan City (202333042)Youth Innovation Group Plan of Shandong Province (2022KJ095)Shenzhen Stable Support Plan Program for Higher Education Institutions Research Program (20220816131408001)Shenzhen Science and Technology Program (JCYJ20230807091802006)。
文摘Current aqueous battery electrolytes,including conve ntional hydrogel electrolytes,exhibit unsatisfactory water retention capabilities.The sustained water loss will lead to subsequent polarization and increased internal resistance,ultimately resulting in battery failure.Herein,a double network(DN) orga no hydrogel electrolyte based on dimethyl sulfoxide(DMSO)/H_(2)O binary solvent was proposed.Through directionally reconstructing hydrogen bonds and reducing active H_(2)O molecules,the water retention ability and cathode/anode interfaces were synergistic enhanced.As a result,the synthesized DN organohydrogel demonstrates exceptional water retention capabilities,retaining approximately 75% of its original weight even after the exposure to air for 20 days.The Zn MnO_(2) battery delivers an outstanding specific capacity of275 mA h g^(-1) at 1 C,impressive rate performance with 85 mA h g^(-1) at 30 C,and excellent cyclic stability(95% retention after 6000 cycles at 5 C).Zn‖Zn symmetric battery can cycle more than 5000 h at 1 mA cm^(-2) and 1 mA h cm^(-2) without short circuiting.This study will encourage the further development of functional organohydrogel electrolytes for advanced energy storage devices.
基金Supported by the National National Science Foundation of China under Grant No 61131004the Fundamental Research Funds for the Central Universities under Grant No DUT14LAB11
文摘Thermal conduetances between Cu and graphene covered carbon nanotubes （gCNTs） are calculated by molecular dynamics simulations. The results show that the thermal conductance is about ten times larger than that of Cu- CNT interface. The enhanced thermal conductance is due to the larger contact area introduced by the graphene layer and the stronger thermal transfer ability of the Cu-gCNT interface. From the linear increasing thermal conductance with the increasing total contact area, an effective contact area of such an interface can be defined.
基金supported by the National Key R&D Program of China under Grant No.2018YFA0701500the National Natural Science Foundation of China under Grant Nos.61825404,U20A20220,61732020,and 61851402+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No.XDB44000000the China Postdoctoral Science Foundation under Grant No.2020M681167。
文摘Resistive switching random access memory(RRAM) is considered as one of the potential candidates for next-generation memory. However, obtaining an RRAM device with comprehensively excellent performance, such as high retention and endurance, low variations, as well as CMOS compatibility, etc., is still an open question. In this work, we introduce an insert TaO_(x) layer into HfO_(x)-based RRAM to optimize the device performance. Attributing to robust filament formed in the TaO_(x) layer by a forming operation, the local-field and thermal enhanced effect and interface modulation has been implemented simultaneously. Consequently, the RRAM device features large windows(> 10^(3)), fast switching speed(-10 ns), steady retention(> 72h), high endurance(> 10^(8) cycles), and excellent uniformity of both cycle-to-cycle and device-to-device. These results indicate that inserting the TaO_(x) layer can significantly improve HfO_(x)-based device performance, providing a constructive approach for the practical application of RRAM.
基金supported by the Science and Technology Development Fund,Macao SAR(file No.0117/2024/AMJ)the Dr.Stanley Ho Medical Development Foundation(SHMDF-OIRFS/2025/002)the University of Macao(MYRG-GRG2023-00041-FST-UMDF,MYRG-GRG2024-00121-FST-UMDF,and MYRG-CRG2024-00014-FST-ICI).
文摘Human skin exhibits extreme sensitivity to spatiotemporal contact events,especially important for dynamic interactions in human-machine interfaces.However,replicating non-invasive haptic feedback for dynamic interaction with a spatiotemporal resolution that matches the human somatosensory system remains challenging because the spatiotemporal design criteria of the haptic interface and the perception characteristic of human beings are not clearly understood.Here,we report a thin electrostatic-enhanced vibro-haptic interface constructed with piezoelectric actuator pixels driven by relativity low voltage,capable of being spatiotemporally programmed for wearable and noninvasive dynamic haptic interaction.Systematic psychophysical tests systematically reveal the relationship between the spatiotemporal parameters(duration,interval,delay,and two-point distance)and human perception characteristics(intensity,continuity,and pixel asynchronous activation perceptibility).Accordingly,wearable haptic music is designed to reproduce the smooth rhythmic beats on a finger(distinguishing accuracy of 95%).Moreover,we demonstrate the reproduction of virtual dynamic interactions,such as recognizing moving directions,textures,and action modes.This work provides clear criteria for designing vibro-haptic interfaces with high spatiotemporal resolution for both physical and virtual applications.
基金supported by the National Natural Science Foundation of China(Nos.12074210,51788104,11790311,and 12141403)the Basic and Applied Basic Research Major Programme of Guangdong Province of China(No.2021B0301030003)Jihua Laboratory(Project No.X210141TL210).
文摘Atomic characterization on tetragonal FeAs layer and engineering FeAs superlattices is highly desirable to get deep insight into the multi-band superconductivity in iron-pnictides.We fabricate the tetragonal FeAs layer by topotactic reaction of FeTe films with arsenic and then obtain KxFe_(2)As_(2)upon potassium intercalation using molecular beam epitaxy.The in-situ low-temperature√2×√2scanning tunneling microscopy/spectroscopy investigations demonstrate characteristic reconstruction of the FeAs layer and stripe pattern of KxFe_(2)As_(2),accompanied by the development of a superconducting-like gap.The ex-situ transport measurement with FeTe capping layers shows a superconducting transition with an onset temperature of 10 K.This work provides a promising way to characterize the FeAs layer directly and explore rich emergent physics with epitaxial superlattice design.
