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Flexible and highly-sensitive pressure sensor based on controllably oxidized MXene

InfoMat 2022年第9期4卷 60-71页

作者： Yanan Ma Yongfa Cheng Jian Wang Si Fu Mengjun Zhou Yue Yang Baowen Li Xin Zhang Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices&International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina School of Mathematics Physics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyanChina Center for Nanoscale Characterization&Devices(CNCD) Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)WuhanChina Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefeiChina State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingChina

Conductive Ti_(3)C_(2)T_(x)MXenes have been widely investigated for the construction of flexible and highly-sensitive pressure *** the inevitable oxidation of solution-processed MXene has been recognized,the effect of the irreversible oxidation of MXene on its electrical conductivity and sensing properties is yet to be ***,we construct a highly-sensitive and degradable piezoresistive pressure sensor by coating Ti_(3)C_(2)T_(x)MXene flakes with different degrees of in situ oxidation onto paper substrates using the dipping-drying *** situ oxidation can tune the intrinsic resistance and expand the interlayer distance of MXene *** partially oxidized MXene-based piezoresistive pressure sensor exhibits a high sensitivity of 28.43 kPa^(-1),which is greater than those of pristine MXene,over-oxidized MXene,and state-of-the-art paper-based pressure ***,these sensors exhibit a short response time of 98.3 ms,good durability over 5000 measurement cycles,and a low force detection limit of 0.8 ***,MXene-based sensing elements are easily degraded and environmentally *** MXene-based pressure sensor shows promise for practical applications in tracking body movements,sports coaching,remote health monitoring,and human–computer interactions.

关键词： adjustable sensitivity in situ oxidation interlayer distance MXene pressure sensor

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Elastic properties of Cu-6wt%Ag alloy wires for pulsed magnets investigated by ultrasonic techniques

arXiv

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arXiv 2024年

作者： Li, Ziyu Gu, Tianyi Wei, Wenqi Yuan, Yang Wang, Zhuo Luo, Kangjian Pan, Yupeng Xie, Jianfeng Zhang, Shaozhe Peng, Tao Liu, Lin Chen, Qi Han, Xiaotao Luo, Yongkang Li, Liang Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China School of Physics Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China School of Materials Science and Engineering State Key Lab for Materials Processing and Die & Mold Technology Huazhong University of Science and Technology Wuhan430074 China

Conductor materials with good mechanical performance as well as high electrical- and thermal-conductivities are particularly important to break through the current bottle-neck limit (∼ 100 T) of pulsed magnets. Here we perform systematic studies on the elastic properties of the Cu-6wt%Ag alloy wires, a promising candidate material for the new-generation pulsed magnets, by employing two independent ultrasonic techniques - resonant ultrasound spectroscopy (RUS) and ultrasound pulse-echo experiments. Our RUS measurements manifest that the elastic properties of the Cu-6wt%Ag alloy wires can be improved by an electroplastic drawing procedure as compared with the conventional cold drawing. We also take this chance to test the availability of our newly-built ultrasound pulse-echo facility at Wuhan National High Magnetic Field Center (WHMFC, China), and the results suggest that the elastic performance of the electroplastically-drawn Cu-6wt%Ag alloy wire remains excellent without anomalous softening under extreme conditions, e.g., ultra-high magnetic field up to 50 T, nitrogen / helium cryogenic liquids. © 2024, CC BY.

关键词： Bottles

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TOWARDS FOUNDATION TIME SERIES MODEL: TO SYNTHESIZE OR NOT TO SYNTHESIZE?

arXiv

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arXiv 2024年

作者： Kuvshinova, Kseniia Tsymboi, Olga Kostromina, Alina Simakov, Dmitry Kovtun, Elizaveta Sber AI Lab. Moscow Russia Moscow Institute of Physics and Technology Moscow Russia Skolkovo Institute of Science and Technology Moscow Russia HSE University Moscow Russia

The industry is rich in cases when we are required to make forecasting for large amounts of time series at once. However, we might be in a situation where we can not afford to train a separate model for each of them. Such issue in time series modeling remains without due attention. The remedy for this setting is the establishment of a foundation model. Such a model is expected to work in zero-shot and few-shot regimes. However, what should we take as a training dataset for such kind of model? Witnessing the benefits from the enrichment of NLP datasets with artificially-generated data, we might want to adopt their experience for time series. In contrast to natural language, the process of generation of synthetic time series data is even more favorable because it provides full control of series patterns, time horizons, and number of samples. In this work, we consider the essential question if it is advantageous to train a foundation model on synthetic data or it is better to utilize only a limited number of real-life examples. Our experiments are conducted only for regular time series and speak in favor of leveraging solely the real time series. Moreover, the choice of the proper source dataset strongly influences the performance during inference. When provided access even to a limited quantity of short time series data, employing it within a supervised framework yields more favorable results than training on a larger volume of synthetic data. The code for our experiments is publicly available on Github https://***/sb-ai-lab/synthesize_or_not. © 2024, CC BY.

关键词： Time series

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Structural,thermomagnetic,and dielectric properties of Mn0.5Zn0.5GdxFe2-xO4(x=0,0.025,0.050,0.075,and 0.1)

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Journal of Advanced Ceramics 2020年第2期9卷 243-254页

作者： Lakshita PHOR Vinod KUMAR Hydrogen Lab Department of PhysicsDCR University of Science and TechnologyMurthal-131039HaryanaIndia

In this paper,effect of Gd^3+was investigated on structural,magnetic,and dielectric properties of Mn0.5Zn0.5GdxFe2–xO4(x=0,0.025,0.050,0.075,and 0.1)nanoparticles prepared by facile coprecipitation method.X-ray diffraction(XRD)studies confirmed the single cubic spinel phase for all the samples and showed that lattice parameter(aexp)was found to increase from 8.414 to 8.446Åwith the substitution of Gd3+ions due to their larger ionic radii than the replaced Fe3+*** and size of developed nanoparticles were studied using transmission electron microscopy(TEM)and found that particle size decreased from 31.06 to 21.12 nm for x=0–*** properties showed that maximum magnetization decreased from 39.21 to 23.59 emu/g,and Curie temperature decreased from 192 to 176℃with increase in x from 0 to 0.1 due to weakening of superexchange *** parameters like dielectric constant(e¢ande¢),dielectric loss(tanδ),AC conductivity(σac),and impedance(Z¢and Z¢)as a function of frequency and composition were analyzed and *** was found thate¢,e¢,σac,and tanδvalues decreased with Gd substitution,which has been explained based on Maxwell–Wagner theory and hopping mechanism of electrons between Fe3+and Fe2+ions at octahedral *** plots for all the developed compositions showed single semi-circular arc which indicate the dominant effect of grain boundaries.

关键词： spinel ferrite coprecipitation method structural property magnetism dielectric property

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Porous Microreactor Chip for Photocatalytic Seawater Splitting over 300 Hours at Atmospheric Pressure

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Nano-Micro Letters 2025年第8期 259-271页

作者： Desheng Zhu Zhipeng Dong Chengmei Zhong Junhong Zhang Qi Chen Ni Yin Wencheng Jia Xiong Zheng Fengzai Lv Zhong Chen Zhenchao Dong Wencai Huang Department of Electronic Engineering School of Electronic Science and TechnologyXiamen University Fuzhou Fuzhi Photocatalysis Research Center i-Lab CAS Key Laboratory of Nanophotonic Materials and DevicesSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University Hefei National Research Center for Physical Sciences at the Microscale and CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China

Photocatalytic seawater splitting is an attractive way for producing green hydrogen. Significant progresses have been made recently in catalytic efficiencies, but the activity of catalysts can only maintain stable for about 10 h. Here, we develop a vacancy-engineered Ag3PO4/Cd S porous microreactor chip photocatalyst, operating in seawater with a performance stability exceeding 300 h. This is achieved by the establishment of both catalytic selectivity for impurity ions and tailored interactions between vacancies and sulfur species. Efficient transport of carriers with strong redox ability is ensured by forming a heterojunction within a space charge region, where the visualization of potential distribution confirms the key design concept of our chip. Moreover, the separation of oxidation and reduction reactions in space inhibits the reverse recombination, making the chip capable of working at atmospheric pressure. Consequently, in the presence of Pt co-catalysts, a high solar-to-hydrogen efficiency of 0.81% can be achieved in the whole durability test. When using a fully solar-driven 256 cm2hydrogen production prototype, a H2evolution rate of 68.01 mmol h-1m-2can be achieved under outdoor insolation. Our findings provide a novel approach to achieve high selectivity, and demonstrate an efficient and scalable prototype suitable for practical solar H2production.

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Towards Differentiating Between Failures and Domain Shifts in Industrial Data Streams

Towards Differentiating Between Failures and Domain Shifts i...

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2024 Workshop on Embracing Human-Aware AI in Industry 5.0, HAII5.0 2024

作者： Wojak-Strzelecka, Natalia Bobek, Szymon Nalepa, Grzegorz J. Stefanowski, Jerzy Jagiellonian Human-Centered AI Lab Mark Kac Center for Complex Systems Research Institute of Applied Computer Science Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. prof. Stanislawa Lojasiewicza 11 Krakow30-348 Poland Institute of Computing Science Poznań University of Technology Poznań60-965 Poland

Anomaly and failure detection methods are crucial in identifying deviations from normal system operational conditions, which allows for actions to be taken in advance, usually preventing more serious damages. Long-lasting deviations indicate failures, while sudden, isolated changes in the data indicate anomalies. However, in many practical applications, changes in the data do not always represent abnormal system states. Such changes may be recognized incorrectly as failures, while being a normal evolution of the system, e.g. referring to characteristics of starting the processing of a new product, i.e. realizing a domain shift. Therefore, distinguishing between failures and such"healthy" changes in data distribution is critical to ensure the practical robustness of the system. In this paper, we propose a method that not only detects changes in the data distribution and anomalies but also allows us to distinguish between failures and normal domain shifts inherent to a given process. The proposed method consists of a modified Page-Hinkley changepoint detector for identification of the domain shift and possible failures and supervised domain-adaptation-based algorithms for fast, online anomaly detection. These two are coupled with an explainable artificial intelligence (XAI) component that aims at helping the human operator to finally differentiate between domain shifts and failures. The method is illustrated by an experiment on a data stream from the steel factory. © 2024 Copyright for this paper by its authors.

关键词： Data streams

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Effect of 60Co γ-Ray Irradiation on the Linearity of Conductance Updating of the HfOx:Mg(9%)-Based Memristive Synapses Studied by Electrochemical Impedance Spectroscopy

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Physica Status Solidi (A) Applications and Materials science 2025年

作者： Feng, Huangcan Song, Hongjia Yao, Linyan Cheng, Juanjuan Zhong, Xiangli Wang, Jinbin School of Materials Science and Engineering Key Laboratory of Low-dimensional Materials and Application Technology Xiangtan University Xiangtan411105 China School of Materials Science and Engineering Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion Department of Physics and Electronic Science Hunan University of Science and Technology Xiangtan411201 China

Binary metal oxide memristive synapses, with their simple structure, high integration density, low power, and high speed, are promising for aerospace computing chips. However, irradiation can degrade their performance. This article investigates the effect of 60Co γ-ray radiation on the memristive synaptic properties of HfOx:Mg(9%), with a particular focus on the changes in the linearity of conductance updating. This is achieved by introducing electrochemical impedance spectroscopy (EIS) to analyze the variations in oxygen-deficient conductive filaments. Results show that increasing irradiation dose (0–1 Mrad(Si)) decreases high-resistance state current during long-term depression, reducing linearity. X-ray photoelectron spectroscopy reveals increased oxygen vacancies postirradiation, while EIS indicates these vacancies hinder conductive filament rupture, causing linearity damage. This research enhances understanding of irradiation effects and supports the development of radiation-resistant memristive synapses. © 2025 Wiley-VCH GmbH.

关键词： X ray photoelectron spectroscopy

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Efficient Contact between H_(2)O and N-Coordinate Ru Nanoparticles in Three-Dimensionally Ordered Macro/Mesoporous Carbon Boosting Alkaline HER

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Chinese Journal of Chemistry 2024年第2期42卷 164-170页

作者： Jiaqing Luo Chunyu Liu Ruolin Zhang Yuanqing Sun Hua Xu Qingying Hu Manxue Zhang Jun Li Zhenxing Li Weiyu Song Yuechang Wei Jian Liu State Key Laboratory of Heavy Oil and Bejing Key Lab of Oil&Gas Optical Detection Technology China University of PetroleumBeijing 102249China Laboratory of Heavy Oil at Karamay Ching University of Petroleum-Beijing at KaramayKaramayXinjiang 83400China Basic Research Center for Energy Interdisciplinary College of ScienceChina University of PetroleumBeijing 102249China Petrochemical Research Institute PetroChina Company LimitedBeijing 102206China BeijingNationalLaboratoryfor Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In this study,a novel approach is proposed to achieve the uniformly dispersed Ru nanoparticles with N coordination loaded on three-dimensionally ordered macro/mesoporous carbon(3DOMMC)through simultaneous pyrolysis of Ru^(3+)and cyanamide on *** an alkaline medium,the synthesized catalysts exhibit exceptional hydrogen evolution reaction(HER)***,Ru-N/3DOMMC demonstrates a significantly low overpotential of 13.8 mV to achieve acrent density of 10 *** exhibits a mass activity 17.5 times higher than that of commercial Pt/*** outstanding performance could be attributed to the ultrahigh Ru dispersion and more efficient contact between active sites and reactant,which derived from the large specific surface area and interconnective three-dimensionally macro/mesopores of 3DOMMC.

关键词： 3DOMMC Hydrogen evolution reaction Electrocatalysis Solid-liquid contact Energy conversion

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Biopolymer passivation for high-performance perovskite solar cells by blade coating

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Journal of Energy Chemistry 2021年第3期30卷 45-52页

作者： Shudi Qiu Xin Xu Linxiang Zeng Zhen Wang Yijun Chen Culling Zhang Chaohui Li Jinlong Hu Tingting Shi Yaohua Mai Fei Guo Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632GuangdongChina Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan UniversityGuangzhou 510632GuangdongChina College of Chemistry Environmental Engineering Datong University.Datong 037009ShanxiChina National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002HenanChina

Thin films of perovskite deposited from solution inevitably introduce large number of defects,which serve as recombination centers and are detrimental for solar cell *** many small molecules and polymers have been delicately designed to migrate defects of perovskite films,exploiting credible passivation agents based on natural materials would offer an alternative ***,an ecofriendly and cost-effective biomaterial,ploy-L-lysine(PLL),is identified to effectively passivate the defects of perovskite films prepared by *** is found that incorporation of a small amount(2.5 mg mL^(-1))of PLL significantly boosts the performance of printed devices,yielding a high efficiency of 19.45% with an increase in open-circuit voltage by up to 100 *** functional theory calculations combined with X-ray photoelectron spectroscopy reveal that the functional groups(-NH2,-COOH)of PLL effectively migrate the Pb-I antisite defects via Pb-N coordination and suppress the formation of metallic Pb in the blade-coated perovskite *** work suggests a viable avenue to exploit passivation agents from natural materials for preparation of high-quality perovskite layers for optoelectronic applications.

关键词： Perovskite solar cells Blade coating Biopolymer passivation Density functional theory

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In-situ lunar dust deposition amount induced by lander landing in Chang’E-3 mission

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science China(Technological sciences) 2020年第3期63卷 520-527页

作者： ZHANG HaiYan WANG Yi CHEN LiPing ZHANG He LI CunHui ZHUANG JianHong LI DeTian WANG YongJun YANG ShengSheng LI XiongYao WANG WeiDong Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsChinese Academy of Space TechnologyLanzhou 730000China Beijing Institute of Physics Chinese Academy of Space TechnologyBeijing 100094China Center for Lunar and Planetary Sciences Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China School of Mechano-Electronic Engineering Xidian UniversityXi'an 710071China

China first in-situ lunar dust experiment is performed by a lunar dust detector in Chang’E-3 mission. The existed dust(less than 20 μm in diameter) properties, such as levitation, transportation and adhesion, are critical constraints for future lunar exploration program and even manned lunar exploration. Based on the problems discussed above, the in-situ lunar dust detector is originally designed to characterize dust deposition properties induced by lander landing as a function of environmental temperature, solar incident angle and orbit short circuit current on the northern Mare Imbrium, aiming to study lunar dust deposition properties induced by lander landing in depth. This paper begins with a brief of introduction of Chang’E-3 lunar dust detector design,followed by a series of experimental analysis of this instrument under different influencing factors, and concludes with lunar dust mass density deposition amount observed on the first lunar day is about 0.83 mg/cm^2, which is less than that observed in Apollo 11 mission because the landing site of Chang’E-3 has the youngest mare basalts comparing with previous Apollo and lunar landing sites. The young geologic environment is less weathered and thus it has thinner layer of lunar dust than Apollo missions’;hence, the amount of kicked-up lunar dust in Chang’E-3 mission is less than that in Apollo 11 mission.

关键词： in-situ lunar dust experiment Chang'E-3 mission unnatural mechanisms lunar dust deposition amount

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