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X-ray Photoelectron Spectroscopy, Raman and Humidity Sensing Properties of Sm3+ Doped CoCr2O4 for Humidity Sensor Applications

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Journal of Inorganic and Organometallic Polymers and materials 2023年第4期34卷 1712-1724页

作者： Jagadeesha Angadi, V. Manjunatha, K. Ho, Ming-Kang Wu, Sheng Yun Ubaidullah, Mohd Al-Enizi, Abdullah M. Pandit, Bidhan Chethan, B. Department of Physics P. C. Jabin Science College Karnataka Hubli580031 India Department of Physics National Dong Hwa University Hualien97401 Taiwan Department of Chemistry College of Science King Saud University Riyadh11451 Saudi Arabia Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos III de Madrid Avenida de la Universidad 30 Madrid Leganés28911 Spain Department of Physics Indian Institute of Science Banglore12 India

This research presents the structural, microstructural, Raman, XPS and humidity sensing behaviour of Sm3+ doped cobalt chromite (CoCr2O4). All samples are synthesized using solution combustion method with urea and glucose as fuels. The X-ray diffraction analysis confirms the single-phase formation with a spinel cubic structure. Field emission scanning electron microscopy micrographs revealed that the materials are porous and include soft agglomerations. Elemental analysis was performed using Energy-dispersive X-ray spectroscopy analysis, confirming the presence of Samarium (3+) in the Sm3+ doped CoCr2O4 samples. The oxidation state of each element was determined using X-ray photoelectron spectroscopy (XPS) for CoCr1.98Sm0.02O4 samples. The vibration bands identified by the Raman spectra confirm the formation of the spinel cubic structure. The electrical properties were measured by using an LCR meter, and it was observed that smaller crystallite size exhibits higher dielectric constant. All the electrical properties were found to increase with increasing samarium concentration. In humid conditions, this material’s resistance to electricity and permittivity and permittivity changes with frequency, making it useful as a capacitive and resistive humidity sensor. The findings of this work pave the way for the use of metal-doped magnetic chromites in applications for humidity sensing. © 2023, The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature.

关键词： X ray photoelectron spectroscopy

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Pressure-Tunable Large Anomalous Hall Effect in Ferromagnetic Metal LiMn_(6)Sn_(6)

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Chinese physics Letters 2024年第5期41卷 69-76页

作者：高玲玲赖俊文陈栋裴翠颖王琦赵毅李昌华曹渭征吴珏霏陈宇林陈星秋孙岩 Claudia Felser 齐彦鹏 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany College of Physics Qingdao UniversityQingdao 266071China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Department of Physics Clarendon LaboratoryUniversity of OxfordParks RoadOxford OX13PUUK School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shanghai Key Laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China

Recently, giant intrinsic anomalous Hall effect(AHE) has been observed in the materials with kagome ***, we systematically investigate the influence of high pressure on the AHE in the ferromagnet LiMn_(6)Sn_(6) with clean Mn kagome lattice. Our in situ high-pressure Raman spectroscopy indicates that the crystal structure of LiMn_(6)Sn_(6) maintains a hexagonal phase under high pressures up to 8.51 GPa. The anomalous Hall conductivity(AHC) σ_(xy)^(A) remains around 150 Ω^(-1)·cm^(-1), dominated by the intrinsic mechanism. Combined with theoretical calculations, our results indicate that the stable AHE under pressure in Li Mn_(6)Sn_(6) originates from the robust electronic and magnetic structure.

关键词： structure mechanism intrinsic

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Control of the Molecular Orientation in EML Using Substrate Temperature for Improving the Electro-Optical Characteristics and Lifetime

Control of the Molecular Orientation in EML Using Substrate ...

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International Symposium, Seminar, and Exhibition, Display Week 2024

作者： Lee, Chang-Hee Kim, Shin-Han Yi, Yeonjin Lee, Jeong-Hwan Lee, Gi-Dong Department of Electronics Engineering Dong-A University Busan Korea Republic of Department of Physics Yonsei University Seoul Korea Republic of Department of Materials Science and Engineering Inha University Incheon Korea Republic of

In this paper, we controlled the molecular alignment property ofthe EML layer in horizontal direction by changing the substrate temperature (Tsub) during deposition at -4, 20, and 40 °C and observed the effect of molecular orientation characteristics of the EML on the electro-optical characteristics and the lifetime of OLED devices. The color property of the devices fabricated indifferent Tsub show same properties, but the optical performance of the cells fabricated at -4 °C was better than those fabricated at high temperatures as we expected due to the horizontal component of the molecular orientation. In particular, as for the life time of the cell, we observed over 4 times longer lifetime of the cell fabricated at -4 °C than the cell fabricated at 40 °C. To analyze the cause of the increase in lifetime, we also observed the surface roughness and grain boundary of the EML fabricated in each Tsub conditions. In addition, more detail data including binding energies between the molecule and deformation data using major molecule weight are also presented either. As a result, we confirm that the Tsub during deposition strongly affects to the molecular anisotropy factor and we can improve the electro-optical and lifetime performance of the OLED cell through low Tsub. © 2024, John Wiley and Sons Inc. All rights reserved.

关键词： Molecular orientation

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Blind Quantum Machine Learning with Quantum Bipartite Correlator

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Physical Review Letters 2024年第12期133卷 120602页

作者： Changhao Li Boning Li Omar Amer Ruslan Shaydulin Shouvanik Chakrabarti Guoqing Wang Haowei Xu Hao Tang Isidor Schoch Niraj Kumar Charles Lim Ju Li Paola Cappellaro Marco Pistoia Global Technology Applied Research Research Laboratory of Electronics Department of Nuclear Science and Engineering Department of Physics Department of Materials Science and Engineering

Distributed quantum computing is a promising computational paradigm for performing computations that are beyond the reach of individual quantum devices. Privacy in distributed quantum computing is critical for maintaining confidentiality and protecting the data in the presence of untrusted computing nodes. In this Letter, we introduce novel blind quantum machine learning protocols based on the quantum bipartite correlator algorithm. Our protocols have reduced communication overhead while preserving the privacy of data from untrusted parties. We introduce robust algorithm-specific privacy-preserving mechanisms with low computational overhead that do not require complex cryptographic techniques. We then validate the effectiveness of the proposed protocols through complexity and privacy analysis. Our findings pave the way for advancements in distributed quantum computing, opening up new possibilities for privacy-aware machine learning applications in the era of quantum technologies.

关键词： Machine learning Quantum algorithms Quantum protocols

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Realizing High-Quality Interfaces in Two-Dimensional Material Spin Valves

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ACS materials Letters 2024年第1期6卷 94-99页

作者： Huang, Ting-Chun Wu, Wen-Hua Wu, Meng-Ting Chuang, Chiashain Pai, Chi-Feng Hsieh, Ya-Ping Hofmann, Mario Department of Physics National Taiwan University Taipei106 Taiwan Department of Electronic Engineering Chung Yuan Christian University Taoyuan320 Taiwan Department of Materials Science and Engineering National Taiwan University Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei115 Taiwan

Two-dimensional (2D) materials are considered enabling components in magnetic spin valves that could increase the performance and robustness of spintronic devices. However, experimental results have been below expectations due to challenges in achieving contamination-free interfaces between the 2D material barrier and its ferromagnetic contacts. We demonstrate an approach to realize interfaces with unprecedented quality using a single-step fabrication approach. By simultaneously depositing two asymmetric contacts on a suspended 2D material, the effect of oxidation and voiding can be avoided. Graphene-based spin valves show a strong interaction at the interface that leads to exceptional magnetoresistance values. This advance permits the characterization of the intrinsic spin properties at the Co/graphene interface, and we establish the limitations of traditional Hanle-based spin-lifetime measurements. Finally, we investigate the differences in spin transport for multilayer graphene-based spin valves. An increased level of spin-scattering is observed that limits the achievable performance and provides guidelines for the future integration of 2D materials in spintronic devices. © 2023 American Chemical Society

关键词： Interfaces (materials)

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Asymmetric scattering behaviors of spin wave dependent on magnetic vortex chirality

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Chinese physics B 2023年第10期32卷 635-640页

作者：张雪枫沈帝虎马晓萍宋成于海明朴红光 Hubei Engineering Research Center of Weak Magnetic-Field Detection China Three Gorges UniversityYichang 443002China Department of Physics College of ScienceYanbian UniversityYanji 133002China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Fert Beijing Institute School of Integrated Circuit Science and EngineeringBeijing Advanced Innovation Center for Big Data and Brain ComputingBeihang UniversityBeijing 100191China

We investigate asymmetric spin wave scattering behaviors caused by vortex chirality in a cross-shaped ferromagnetic system by using the micromagnetic *** the system,four scattering behaviors are found:(i)asymmetric skew scattering,depending on the polarity of vortex core,(ii)back scattering(reflection),depending on the vortex core stiffness,(iii)side deflection scattering,depending on structural symmetry of the vortex circulation,and(iv)geometrical scattering,depending on waveguide *** first and second scattering behaviors are attributed to nonlinear topological magnon spin Hall effect related to magnon spin-transfer torque effect,which has value for magnonic exploration and application.

关键词： magnonics magnetic vortex spin wave magnetic chirality

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Facile synthesis of accordion-like porous carbon from waste PET bottles-based MIL-53(Al)and its application for high-performance Zn-ion capacitor

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Green Energy & Environment 2024年第7期9卷 1138-1150页

作者： Jiaxin Li Shuai Zhang Yumeng Hua Yichao Lin Xin Wen Ewa Mijowska Tao Tang Xuecheng Chen Rodney S.Ruoff Faculty of Chemical Technology and Engineering West Pomeranian University of TechnologyPiastow Ave.4271-065SzczecinPoland Key State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China School of Safety Engineering China University of Mining and TechnologyXuzhou221116China Institute of Advanced Electrical Materials Qingdao University of Science and TechnologyQingdao266042China Institute for Basic Science Center for Multiple Dimensional Carbon Materials Ulsan44919Republic of Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea Department of Materials Science and Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan44919Republic of Korea

It is of great scientific and economic value to recycle waste poly(ethylene terephthalate)(PET)into high-value PET-based metal organic frameworks(MOFs)and further convert it into porous carbon for green energy storage *** the present study,a facile and costeffective hydrothermal process was developed to direct recycle waste PET bottles into MIL-53(Al)with a 100% conversation,then the MOFderived porous carbon was assembled into electrodes for high-performance *** results indicated that the as-synthesized carbon exhibited high SSA of 1712 m^(2)g^(-1)and unique accordion-like structure with hierarchical *** to these advantageous characters,the assembled three-electrode supercapacitor displayed high specific capacitances of 391 F g^(-1)at the current density of 0.5 A g^(-1)and good rate capability of 73.6% capacitance retention at 20 A g^(-1)in 6 mol L^(-1)KOH ***,the assembled zinc ion capacitor still revealed outstanding capacitance of 335 F g^(-1)at 0.1 A g^(-1),excellent cycling stability of 92.2% capacitance retention after 10000 cycles and ultra-high energy density of 150.3 Wh kg^(-1)at power density of 90 W kg^(-1)in 3 mol L^(-1)ZnSO_(4)*** is believed that the current work provides a facile and effective strategy to recycle PET waste into high-valuable MOF,and further expands the applications of MOF-derived carbons for high-performance energy storage devices,so it is conducive to both pollution alleviation and sustainable economic development.

关键词： PET Recycling Porous carbon Supercapacitor Energy storage

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Magnetic field enhanced thermal conductivity and origin of large thermopower in layered cobaltates

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Journal of Materiomics 2023年第6期9卷 1048-1055页

作者： Yinong Yin Fanfan Shi Guo-Qiang Liu Ashutosh Tiwari Jiazheng Hao Lunhua He Dan Liu Jianfeng Cai Xiaojian Tan Jun Jiang Baogen Shen Department of Physics Beijing Technology and Business UniversityBeijing100048China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesZhejiang315201China Department of Materials Science and Engineering University of UtahSalt Lake CityUT84112USA Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Spallation Neutron Source Science Center(SNSSC) Dongguan523803China State Key Laboratory of Magnetism Institute of PhysicsChinese Academy of SciencesBeijing100190China

Cobalt oxide,as one of the most fascinating examples of correlated electronic system,exhibits several exotic transport characteristics,such as superconductivity,charge ordering,and topological *** this study,we are reporting the observation of another intriguing transport phenomenon in calcium ***,under a large magnetic field of 7 T,we observed an anomalously enhanced thermal conductivity that was accompanied with a largely suppressed *** observation reveals a hitherto undiscovered correlation between the two transport *** the premise of Heisenberg model,we have shown that the observed experimental results can be explained consistently only if the magnon excitation is taken into *** study offers an insight into the puzzling origin of large thermopower observed in layered cobaltates and provides a specific strategy for further optimization of thermopower.

关键词： Calcium cobaltates Thermal conductivity Spin-wave Spin entropy

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Investigation of mechanical properties, viscoelastic properties and free vibration analysis of natural fibre reinforced composite materials

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Interactions 2024年第1期245卷 1-21页

作者： SathishKumar, G. Prashanth, K.S. Khatoon, Umme Thahira Selvarani, A. Geetha Sridhar, R. Sivabalan, S. Chakravarthy, P. R. Kalyana V.Vijayan Baskar, S. School of Engineering Vels Institute of Science Technology & Advanced Studies Chennai600117 India Department of Physics New Horizon College of Engineering Bengaluru India Department of Metallurgical and Materials Engineering National Institute of Technology Warangal Hanamkonda India Department of Civil Engineering Vel Tech Rangarajan Dr. Sagunthala R & ampD Institute of Science and Technology Avadi India Department of Mechanical Engineering K.Ramakrishnan College of Technology Tamil Nadu Tiruchirappalli India

This study aims to assess the mechanical properties and damping characteristics of polyester composites reinforced with flax and kenaf fibers, incorporating 5 wt.% each of rice husk and wood dust. The research will employ mechanical testing, dynamic mechanical analysis across various temperatures and frequencies, and Scanning Electron Microscopy (SEM). Experiments will measure tensile strength, flexural strength, impact strength, hardness, natural frequency, and damping coefficient (tan δ). SEM imaging will examine the fractured surfaces of tensile samples. Composites will be fabricated using a manual layup technique, combining mat fiber with 5 wt.% each of rice husk and wood dust. Initial findings suggest that fiber incorporation decreases damping curves (tan δ), while the addition of rice husk and wood dust positively correlates with the composite's natural frequency and damping factor. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Tensile strength

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Specific Ion Effects on the Enzymatic Degradation of Polyester Films

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Chinese Journal of Polymer science 2023年第4期41卷 476-482,I0005页

作者： Jian Zhang Jie Zhu Zan Hua Guang-Ming Liu Department of Chemical Physics Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei230026China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province College of Material and Textile EngineeringJiaxing UniversityJiaxing314001China Biomass Molecular Engineering Center and Department of Materials Science and Engineering School of Forestry and Landscape ArchitectureAnhui Agricultural UniversityHefei230036China

Soil environment on earth contains a variety of ions,which are expected to play a vital role in the biodegradation of plastics discarded in the *** this work,poly(butyleneadipate-co-terephthalate)(PBAT)is employed as a model biodegradable plastic to study the specific ion effects on the enzymatic degradation of polyester *** results show that the specific ion effects on the enzymatic degradation rate of the PBAT films and on the catalytic rate constant for the enzymatic hydrolysis of the ester bonds are strongly dependent on temperature and ionic *** the enzymatic degradation rate and catalytic rate constant decrease following the trends Na^(+)>K^(+)>Ca^(2+)and Cl^(-)>SO_(4)^(2-)>NO_(3)^(-)for cations and anions,respectively,indicating that the ion-specific enzymatic degradation of the PBAT films is closely correlated with the specific ion effects on enzymatic hydrolysis of the ester *** study shows that the specific ion effects on the enzyme activity can be understood by taking into account the ion-specific cation-anion interaction,ionic dispersion force,salting-out effect and salting-in *** study of specific ion effects on the enzymatic hydrolysis of the ester bonds and the resultant enzymatic degradation of the PBAT films would offer us a new clue to develop new biodegradable,environmentally friendly synthetic plastics.

关键词： Specific ion effects Biodegradable films Ion-enzyme interactions Enzyme activity

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