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Temperature-driven reversible structural transformation and conductivity switching in ultrathin Cu_(9)S_(5)crystals

Nano Research 2023年第7期16卷 10515-10521页

作者： Lei Zhang Zeya Li Ying Deng Li Li Zhansheng Gao Jiabiao Chen Zhengyang Zhou Junwei Huang Weigao Xu Xuewen Fu Hongtao Yuan Feng Luo Jinxiong Wu Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSmart Sensor Interdisciplinary Science CenterSchool of Materials Science and EngineeringNankai UniversityTianjin 300350China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Ultrafast Electron Microscopy Laboratory The Ministry of Education(MOE)Key Laboratory of Weak-Light Nonlinear PhotonicsSchool of PhysicsNankai UniversityTianjin 300071China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200093China

Two-dimensional(2D)materials with reversible phase transformation are appealing for their rich physics and potential applications in information ***,up to now,reversible phase transitions in 2D materials that can be driven by facile nondestructive methods,such as temperature,are still ***,we introduce ultrathin Cu_(9)S_(5)crystals grown by chemical vapor deposition(CVD)as an exemplary *** the first time,their basic electrical properties were investigated based on Hall measurements,showing a record high hole carrier density of~1022 cm^(-3) among 2D ***,an unusual and repeatable conductivity switching behavior at~250 K were readily observed in a wide thickness range of CVD-grown Cu_(9)S_(5)(down to 2 unit-cells).Confirmed by in-situ selected area electron diffraction,this unusual behavior can be ascribed to the reversible structural phase transition between the room-temperature hexagonalβphase and low-temperatureβ’phase with a *** work provides new insights to understand the physical properties of ultrathin Cu_(9)S_(5)crystals,and brings new blood to the 2D materials family with reversible phase transitions.

关键词： ultrathin Cu_(9)S_(5)crystals ultrahigh carrier density reversible phase transition conductivity switching chemical vapor deposition

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Two-dimensional MXenes:New frontier of wearable and flexible electronics

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InfoMat 2022年第4期4卷 1-28页

作者： Abbas Ahmed Sudeep Sharma Bapan Adak Md Milon Hossain Anna Marie LaChance Samrat Mukhopadhyay Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticutUSA Advanced Sensor and Energy Research(ASER)Lab Department of Electronic EngineeringKwangwoon UniversitySeoulSouth Korea Department of Textile and Fiber Engineering Indian Institute of TechnologyNew DelhiIndia Department of Textile Engineering Chemistry and ScienceNorth Carolina State UniversityRaleighNorth CarolinaUSA Department of Textile Engineering Khulna University of Engineering&TechnologyKhulnaBangladesh Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsConnecticutUSA

Wearable electronics offer incredible benefits in mobile healthcare monitoring,sensing,portable energy harvesting and storage,human-machine interactions,etc.,due to the evolution of rigid electronics structure to flexible and stretchable ***,transition metal carbides and nitrides(MXenes)are highly regarded as a group of thriving two-dimensional nanomaterials and extraordinary building blocks for emerging flexible electronics platforms because of their excellent electrical conductivity,enriched surface functionalities,and large surface *** article reviews the most recent developments in MXene-enabled flexible electronics for wearable *** MXeneenabled electronic devices designed on a nanometric scale are highlighted by drawing attention to widely developed nonstructural attributes,including 3D configured devices,textile and planer substrates,bioinspired structures,and printed ***,the unique progress of these nanodevices is highlighted by representative applications in healthcare,energy,electromagnetic interference(EMI)shielding,and humanoid control of *** emerging prospects of MXene nanomaterials as a key frontier in nextgeneration wearable electronics are envisioned and the design challenges of these electronic systems are also discussed,followed by proposed solutions.

关键词： flexible electronics MXene nanostructures wearable electronics

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UAS Simulator: A laboratory Set-Up 1

UAS Simulator: A Laboratory Set-Up

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1st International Conference on Emerging Trends in Information Technology and Engineering, ic-ETITE 2020

作者： Kasana, Abhishek Misra, Ajay Naidu, V.P.S. Defence Institute of Advanced Technology Department of Aerospace Engg. Pune India CSIR - National Aerospace Laboratories Multi-Sensor Data Fusion Lab Bangalore-17 India

ISBN: (纸本)9781728141428

This work describes the procedure for laboratory setup for Unmanned Aerial System (UAS) Simulator. UAS has three major components viz., UAV (or drone), Pilot and the system in place that connects both of them or interface. This simulator not only helps pilot for training purposes, designers for testing new models, mission planners in planning missions in a different environment but also helps in testing and development of the Synthetic Vision System (SVS). SVS generates a rendered image or 3D image of the flying environment and aware operator using an onboard database of terrain, obstacles, and relevant cultural features. © 2020 IEEE.

关键词： Unmanned aerial vehicles (UAV)

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New intelligent battery management system for drones

New intelligent battery management system for drones

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ASME 2019 International Mechanical Engineering Congress and Exposition, IMECE 2019

作者： Hashemi, Seyed Reza Esmaeeli, Roja Aliniagerdroudbari, Haniph Alhadri, Muapper Alshammari, Hammad Mahajan, Ajay Farhad, Siamak Advanced Energy and Sensor Lab University of Akron AkronOH United States

ISBN: (纸本)9780791859438

Drones or Unmanned Aerial Vehicles (UAV) are the aircraft controlled remotely by radio waves or autonomously and can fly without a pilot and passengers. Demands for drones with long flight times are increasing significantly in the personal and commercial applications. One of the main issues about drones is their power management. However, these devices are powered by a high energy density lithium battery, but a flight time range could be about 20–40 min. Increasing the battery energy storage capacity to achieve more flight time is not usually a good idea due to the additional weight in drones. In order to solve this issue, an Intelligent Battery Management System (IBMS) is proposed to predict the maximum available energy of the battery pack to make the best decision for finding the closest charging station depending on different weather conditions. In this study, lithium-ion battery with lithium titanite oxide (LTO) anode, as a fast charging and fast discharging battery, is used as the drone power supply. The proposed IBMS can not only increase the performance and life of the battery system but also it can estimate the battery cells state of charge (SOC) based on a system identification method. Results show that the proposed system has an accurate estimation of the maximum available energy, and therefore accurate flight time prediction to find the best recharging node for the drone. Copyright © 2019 ASME.

关键词： Battery management systems

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Univariate and multivariate gauge repeatability and reproducibility analysis on the high frequency dynamic mechanical analysis (DMA) measurement system

Univariate and multivariate gauge repeatability and reproduc...

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ASME 2019 International Mechanical Engineering Congress and Exposition, IMECE 2019

作者： Esmaeeli, Roja Aliniagerdroudbari, Haniph Hashemi, Seyed Reza Al-Shammari, Hammad Alhadri, Muapper Farhad, Siamak Advanced Energy and Sensor Lab University of Akron AkronOH United States

ISBN: (纸本)9780791859384

The quality of the collected data from a measurement system affects eventual decision making process. Therefore, the reliability of any measurement system is an important factor to be studied. Gauge repeatability and reproducibility (Gauge R&R) is the standard method to evaluate the measurement system and assess the adequacy of variation in the measurement data. Gauge R&R is a statistical tool which evaluates two main characteristics of the measurement system: repeatability and reproducibility. The Dynamic Mechanical Analysis (DMA) is a common measurement system for studying the dynamic mechanical properties of viscoelastic materials such as polymers. The newly developed High Frequency Dynamic Mechanical Analysis (HFDMA) is able to directly run the simple shear test at high frequencies without changing the specimen temperature. The complex shear modulus and damping factor of the viscoelastic materials are reported by the HFDMA system. In this study the uni-variable Gauge R&R study based on Analysis of Variance (ANOVA) is done on each measured characteristic of the HFDMA measurement system. The source of variations for each characteristic is distinguished. Then the multivariate Gauge R&R based on the Multivariate Analysis of Variance (MANOVA) is done and the percentage of multivariate Gauge R&R for the measurement with the multiple variables is reported. The results indicate that the HFDMA measurements are both repeatable and reproducible. Thus, the new HFDMA can be used as a measurement system to measure the mechanical properties of viscoelastic materials at high frequencies. Copyright © 2019 ASME.

关键词： Statistical mechanics

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Ultrafast polarization modulation with high-purity chiral quasi-BIC metasurfaces

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Chinese Optics Letters 2025年第5期 142-148页

作者：赖方兴范宇斌沙新博邓画春蒋雄肖淑敏黄灿宋清海 Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology (Shenzhen) Department of Electrical Engineering City University of Hong Kong Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Devices

Precise control of the polarization state of light on ultrafast time scales plays a key role in revealing the inherent chiral or anisotropic optical responses in various material systems, and it is crucial for applications that require complex polarization encoding. Here, we explore ultrafast polarization control enabled by silicon-based chiral bound state in the continuum（BIC）metasurfaces. By utilizing the intrinsic chiral mode, we achieve high-purity chiral reflection light（S3～-0.92） and rapid modulation（～0.4 ps） of polarization states through all-optical methods. Unlike traditional polarization modulation techniques, our approach leverages the unique advantages of slanted etching dielectric chiral BIC metasurfaces, which facilitate high-Q resonance and exhibit narrow linewidths. These advantages allow swift alterations in polarization states with minimal modulation energy consumption, which should help for greater control of light in integrated photonic applications.

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One-Step Coaxial Spinning of Core-Sheath Hydrogel Fibers for Stretchable Ionic Strain sensors

SSRN

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SSRN 2022年

作者： Wu, Hui Wang, Lin Lou, Hengyi Wan, Junmin Pu, Xiong National Engineering Lab of Textile Fiber Materials & Processing Technology Zhejiang Sci-Tech University Hangzhou310018 China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China Key Laboratory of Advanced Textile Materials and Manufacturing Technology

High-strength, highly conductive, and stretchable conductive fibers are essential for the development of flexible electronic devices. Here, we develop a continuous coaxial wet-spinning method to fabricate stretchable, conductive, and freeze-resistant hydrogel fibers with a core-sheath structure. The core is a supramolecular hydrogel, poly (APhe-AAm) (PAA), obtained by radical polymerization of acrylamide (AAm) and acryloyl-L-phenylalanine (APhe), and the sheath consists of PVDF-HFP and PU with hydrochloric acid as the coagulation bath. The hydrogel fibers exhibit excellent mechanical properties with a tensile strength of 3.1 MPa and elongation at a break of 750% due to the abundant multi-hydrogen bonding interactions. Hydrochloric acid plays two roles in this system: one is to promote hydrogen bond formation and improves mechanical properties, and the other is to provide plentiful ions to confer excellent electrical conductivity (10.59 S m-1) and freezing resistance (-20 oC). The application of fiber strain sensors for detecting human motion and pressure sensing demonstrates great potential as wearable electronic devices. © 2022, The Authors. All rights reserved.

关键词： Temperature

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Effect of Hemoglobin Hydration on the Physical Properties of Erythrocyte Cytoplasm and Whole Blood

SSRN

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SSRN 2022年

作者： Zhbanov, Alexander Lee, Ye Sung Son, Minkook Jung, Myoung Hoon Eom, Kunsun Yang, Sung 123 Cheomdangwagi-ro Buk-gu Gwangju61005 Korea Republic of 123 Cheomdangwagi-ro Buk-gu Gwangju61005 Korea Republic of Healthcare Sensor Lab Device Research Center Samsung Advanced Institute of Technology Samsung Electronics Co. Ltd. 130 Samsung-ro Yeongtong-gu Suwon-si Gyeonggi-do 16678 Korea Republic of

Electrochemical impedance spectroscopy of whole blood and blood cells has great potential for assessing the health of patients. This potential has not been fully exploited for a detailed examination of the erythrocyte interior. The erythrocyte interior (cytoplasm) is often considered as continuous media. However, cytoplasm is a colloidal suspension of hydrated hemoglobin molecules. This study mainly focuses on the effect of hemoglobin hydration on the dielectric properties of erythrocyte cytoplasm and whole blood. The impedance spectra of separated cytoplasm and whole blood were measured at frequencies from 1 kHz to 110 MHz. The effective medium theory was used to analyze the experimental data. The cytoplasm was found to be best described as a colloid of hemoglobin cores surrounded by double hydration shells. The dielectric properties of the hemoglobin core, hydration shells and free intracellular fluid, as well as the thickness of the shells, were numerically determined from the impedance spectrum. An approach was developed to determine the intracellular fluid's viscosity and the density of bound water in the hydration shells. It shows that the hemoglobin hydration has a significant effect on the physical properties of blood. The detailed electrical properties of the cytoplasm can be detected from the impedance spectrum of whole blood. © 2022, The Authors. All rights reserved.

关键词： Hemoglobin

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Real-time online multi-object tracking: A joint detection and tracking framework 3

Real-time online multi-object tracking: A joint detection an...

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3rd International Conference on Computer Science and Artificial Intelligence, CSAI 2019 and its Workshop - The 11th International Conference on Information and Multimedia Technology, ICIMT 2019

作者： Yi, Mengyun Zhang, Sheng Xu, He Department of Electronic Engineering Tsinghua University Beijing China Advanced Sensor and Integrated System Lab Tsinghua Shenzhen International Graduate School Shenzhen China

ISBN: (纸本)9781450376273

In recent years, object detection technology has been continuously developed, and the tracking-by-detection strategy has gradually become the main method of multi-object tracking. Based on detection, the accuracy of the multi-object tracking depends on the detection results to a large extent. However, in many practical applications, especially the case of complex scenes and crowded objects, the detection results are usually inaccurate. In this paper, a joint detection and tracking framework is proposed with a unified confidence scoring function to evaluate tracks confidence and complement low confidence detections with high confidence tracks. In this way, detections and tracks can be combined organically and achieved complementarity. High confidence detection results can prevent long-term tracking drift, while high confidence tracking prediction can deal with false detection and missed detection caused by occlusion during object interaction. Moreover, we trained the ReID appearance feature with higher identification capabilities on the large-scale person reidentification datasets, which has higher identification capability. Extensive experiments are conducted on MOT17 benchmarks to demonstrate the real-time and advanced performance of our tracker. © 2019 Association for Computing Machinery.

关键词： Object detection

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Real-Time Online Multi-Object Tracking: A Joint Detection and Tracking Framework 2019

Real-Time Online Multi-Object Tracking: A Joint Detection an...

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Proceedings of the 2019 3rd International Conference on Computer Science and Artificial Intelligence

作者： Mengyun Yi Sheng Zhang He Xu Department of Electronic Engineering Tsinghua University Beijing China Advanced Sensor and Integrated System Lab Tsinghua Shenzhen International Graduate School Shenzhen China

ISBN: (纸本)9781450376273

In recent years, object detection technology has been continuously developed, and the tracking-by-detection strategy has gradually become the main method of multi-object tracking. Based on detection, the accuracy of the multi-object tracking depends on the detection results to a large extent. However, in many practical applications, especially the case of complex scenes and crowded objects, the detection results are usually inaccurate. In this paper, a joint detection and tracking framework is proposed with a unified confidence scoring function to evaluate tracks confidence and complement low confidence detections with high confidence tracks. In this way, detections and tracks can be combined organically and achieved complementarity. High confidence detection results can prevent long-term tracking drift, while high confidence tracking prediction can deal with false detection and missed detection caused by occlusion during object interaction. Moreover, we trained the ReID appearance feature with higher identification capabilities on the large-scale person re-identification datasets, which has higher identification capability. Extensive experiments are conducted on MOT17 benchmarks to demonstrate the real-time and advanced performance of our tracker.

关键词： Joint Detection and Tracking Person Re-identification Multi-Object Tracking

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