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A multifunctional stealthy material for wireless sensing and active camouflage driven by configurable polarization

Journal of materials science & Technology 2023年第1期132卷 42-49页

作者： Min Zhang Mao-Sheng Cao Qiang-Qiang Wang Xi-Xi Wang Wen-Qiang Cao Hui-Jing Yang Jie Yuan School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Physics Beijing Technology and Business UniversityBeijing 100048China School of Electrical and Electronic Engineering Nanyang Technological University639798Singapore Department of Physics Tangshan Normal UniversityTangshan 063000China School of Information Engineering Minzu University of ChinaBeijing 100081China

The dipole species transformation and polarization relaxation configuration are achieved by changing the cobalt ion stoichiometry,which precisely tailors the electromagnetic attenuation performance of bismuth iron cobalt *** the stoichiometric ratio of Fe:Co is 19:1,the optimal reflection loss reaches-60 *** high electromagnetic attenuation performance significantly improve the linear sensitivity of the strain response and active customized stealth capability of the designed multifunctional capacitor-like ***,the wireless multifunctional design integrates energy attenuaten of electromagnetic wave with the wireless sensing and active camouflage functions for the first *** work provides an important step for the realization of electromagnetical multifunctional applications including electromag-netic protection and electromagnetic sensing in artificial beings,medical health and even space travel.

关键词： Electromagnetic absorption Polarization relaxation Electromagnetic sensing Active camouflage

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Synergistic Effect of Nitrogen/Phosphorus Co-Doping and Molybdenum Carbide Induced Electron Redistribution of Carbon Layer to Boost Hydrogen Evolution Reaction

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Chinese Journal of Chemistry 2024年第1期42卷 55-60页

作者： Jiamin Xiao Peng Li Yanyan Sun Heng Liu Javid Khan Handong Zhang Han Zhou Yaqiong Su Shuangyin Wang Lei Han College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangshaHunan 410082China School of Chemistry Engineering Research Center of Energy Storage Materials and Devices Ministry of EducationXi'an Key Laboratory of Sustainable Energy Materials ChemistryState Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'anShaanxi 710049China School of Materials Science and Engineering Central South UniversityChangshaHunan 410083China state Key Laboratory of Chem/Bio-Sensingand Chemometrics College of Chemistry and Chemical EngineeringHunan University ChangshaHunan 410082China Laboratory of Inorganic Materials and Catalysis Department of Chemical Engineering and ChemistryEindhoven University of Technology P.O.Box5135600 MB EindhovenThe Netherlands

The development of highly efficient non-precious-metal-based electrocatalysts for the hydrogen evolution reaction is imperative for promoting the large-scale application of electrochemical water ***,nitrogen/phosphorus co-doped carbon nanorods encapsulated Mo_(2)C nanoparticles(Mo_(2)C@PNc)have been prepared by pre-phosphating treatment in combination of the coordination with polydopamine and the subsequent *** phosphating temperature has a significant effect on the content of phosphorus within the resultant Mo_(2)C@PNC,and the optimal catalyst delivers superior HER activity with the low overpotential of 104 mV at a current density of 10 mAcm^(-2) and good stability for 8 h,which has been theoretically demonstrated to originate from the synergistic effect between P doping and Mo_(2)C induced electron redistribution of nitrogen-doped carbon layer.

关键词： Molybdenum carbide N/P co-doped carbon Hydrogen evolution Synergistic effect Electron redistribution Comprehensive

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Change of electrical and Transport Properties of Nickel Oxide by Carrier Concentration and Temperature through First‑Principle Calculations

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Nanomanufacturing and Metrology 2023年第4期6卷 109-118页

作者： Nayem Md.Reza Shah Chang‑Dong Yeo Minyeong Choi Yang‑Ki Hong Jeong H.You Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA Department of Electrical and Computer Engineering and Material Science Ph.D.Program The University of AlabamaTuscaloosaAL 35487USA Department of Mechanical Engineering School of EngineeringUniversity of St.ThomasSt.PaulMN 55105USA

Nickel is typically used as one of the main components in electrical contact devices or *** oxide(NiO)is usually formed on the surfaces of electrodes and can negatively impact system performance by introducing electrical contact *** thermal,electrical,and transport properties of NiO,as a Mott insulator or a p-type semiconductor,can be altered by operating and environmental conditions such as temperature and stress/strain by *** this study,we inves-tigate the fundamental material properties of NiO through the first-principle ***,we obtain and compare the lattice parameter,magnetic moment,and electronic structure for NiO via the WIEN2K simulations with four different poten-tials(i.e.,GGA,GGA+U,LSDA,and LSDA+U).Then,using the WIEN2K simulation results with LSDA+U potential that produces a highly accurate bandgap for NiO,we calculate the electrical conductivity and electrical part of the thermal conductivity of nickel and NiO as a function of temperature and carrier concentration through the BoltzTraP *** simulation results revealed that the electrical conductivity relative to the relaxation time for NiO increases with the carrier concentration,while it shows a slightly decreasing trend with temperature under a fixed carrier *** contrast,the electrical part of the thermal conductivity shows an increasing trend considering carrier concentration and temperature.

关键词： Nickel oxide Magnetic moments Density of states Seebeck coefcient electrical conductivity

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Spectroscopic Studies on Sulfides and Selenides of Mo and W for Photoabsorbers 152nd

Spectroscopic Studies on Sulfides and Selenides of Mo and W ...

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152nd Annual Meeting and Exhibition of The Minerals, Metals and materials Society, TMS 2023

作者： Kaul, Anupama B. Department of Electrical Engineering Department of Materials Science and Engineering PACCAR Technology Institute University of North Texas DentonTX76207 United States

ISBN: (纸本)9783031225239

In this work, we present our findings on spectroscopic studies conducted on two transition metal sulfides and selenides formed with Mo and W. In the first part of the work, we present the temperature-dependent (~80 K to 573 K) frequency shifts of the Raman-active E2g1 and A1g modes of multilayer molybdenum disulfide (MoS2) formed using solution exfoliation, where a red-shift in the peak locations was observed with increasing temperature. After these spectroscopic studies, the semiconducting dispersion of MoS2 was then integrated with graphene ink, to create an integrated inkjet-printed heterostructure photodetector onto flexible substrates, that was responsive within the visible regime. In the second part of the work, Raman and photoluminescence spectroscopy was utilized to analyze the phononic and electronic parameters in suspended bulk WSe2 sheets, fabricated utilizing photolithography and wet chemical etching. The response of the PL spectra for WSe2 on supported and suspended regions showed the indirect I-peak and the excitonic A-peak to be red-shifted in the latter case, with an increase in the emission intensity as well. © 2023, The Minerals, Metals & materials Society.

关键词： Tungsten compounds

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Mechanically durable,super-repellent 3D printed microcell/nanoparticle surfaces

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Nano Research 2022年第6期15卷 5678-5686页

作者： Sajad Haghanifar Anthony J Galante Mehdi Zarei Jun Chen Susheng Tan Paul W Leu Department of Industrial Engineering University of PittsburghPittsburghPA 15261USA Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA Department of Electrical and Computer Engineering and Peterson Institute of NanoScience and Engineering University of PittsburghPittsburghPA 15261USA Department of Chemical Engineering University of PittsburghPittsburghPA 15261USA

Three-dimensional(3D)printed re-entrant micropillars have demonstrated high static contact angles for an unprecedented variety of liquids,but have yet to achieve this with low contact angle hysteresis and excellent abrasion *** report on the demonstration of 3D printed microcell/nanoparticle structures that exhibit high static contact angle,low contact angle hysteresis,and high mechanical *** and microcells both exhibit high static contact angles with water and ethylene glycol(EG),but suffer from high contact angle hysteresis,indicative of rose petal *** modeling results indicate that micropillars are able to achieve higher static contact angle and breakthrough pressure simultaneously compared with ***,simulations also indicate that micropillars have higher maximum equivalent stress at their bases,so that they are more prone to mechanical *** address contact angle hysteresis and mechanical durability issues by the creation of 3D printed microcell/nanoparticle arrays that demonstrate super-repellency and retain their super-repellency after 100 cycles of mechanical abrasion with a Scotch-Brite abrasive pad under a pressure of 1.2 *** use of interconnected microcell structures as opposed to micropillars addresses mechanical durability *** contact angle hysteresis is realized by coating 3D printed structures with low surface energy nanoparticles,which lowers the solid–liquid contact area *** results demonstrate new 3D printed structures with mechanical durability and super-repellency through the use of microcell structures integrated with fluorinated nanoparticles.

关键词： superomniphobicity three-dimensional(3D)printing surface evolver mechanical durability microcell re-entrant micropillar

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Improving PEM Hydrogen Electrolyser Efficiency using AC Excitation

Improving PEM Hydrogen Electrolyser Efficiency using AC Exci...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Larsen, Thea Kim, Seho Kennedy, John Liu, Jingjing University of Auckland Department of Electrical Computer and Software Engineering Auckland New Zealand Earth Resources and Materials Geological and Nuclear Science Wellington New Zealand The University of Auckland Department of Chemical and Materials Engineering Auckland New Zealand

ISBN: (纸本)9798350376067

Hydrogen is a potential clean energy source that minimises environmental impacts but is currently economically prohibitive due to the low energy conversion efficiency. In order to improve the economic viability, this paper investigates improving the efficiency of hydrogen electrolysis. The prototype power electronics presented in this paper provide low-frequency AC or pulsed current to a proton exchange membrane (PEM) electrolyser to improve the operational efficiency up to 4.2% in contrast to the typical constant current or voltage excitation. © 2024 IEEE.

关键词： Clean energy

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Boosting overall water splitting by incorporating sulfur into NiFe(oxy)hydroxide

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Journal of Energy Chemistry 2022年第1期31卷 364-371,I0010页

作者： Chiho Kim Seong Hyun Kim Seunghun Lee Ilyeong Kwon Seong Hyun Kim Shinho kim Changgyu Seok Yoo Sei Park Yangdo Kim Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea BK21 Four Innovative Graduate Education Program for Global High-tech Materials&PartsPusan National UniversityBusan 46241Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH).Pohang 37673Republic of Korea

Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water ***-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal *** incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH *** enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of *** performance for overall water splitting was achieved with an alkaline water *** was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural *** study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and *** addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.

关键词： Overall water splitting Hydrogen production Sulfur incorporated NiFe(oxy)hydroxide Electrocatalysts Solar-driven water splitting

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Machine learning electron-phonon interactions in two-dimensional semiconducting materials: The case of zero-point renormalization

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Physical Review materials 2024年第10期8卷 L101001页

作者： Anubhab Haldar Quentin Clark Marios Zacharias Feliciano Giustino Sahar Sharifzadeh Department of Electrical and Computer Engineering Department of Philosophy Oden Institute for Computational Engineering and Sciences Department of Physics Division of Materials Science and Engineering

We utilize first-principles theory to investigate the role of electron-phonon interactions within a dataset of monolayer materials. Using density functional theory to describe excited-state transitions and the special displacement method to describe the role of phonons, we analyze the relationship between simple physical observables and electron-phonon coupling strength. For over 100 materials, we compute the band gap renormalization due to zero-point vibrational (ZPR) motion as a measure of electron-phonon interactions and train a machine learning model based on physical parameters. We demonstrate that the strength of electron-phonon interactions is highly dependent on the band gap, dielectric constant, and degree of ionicity, all of which can be physically justified. We then apply this model to 1302 2D materials, predicting the ZPR, which for five randomly selected materials tested agree well with the first-principles predictions. This work provides an approach for quantitatively predicting the ZPR as a measure of electron-phonon interactions in 2D materials.

关键词： Electron-phonon coupling Electronic structure 2-dimensional systems Machine learning

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Guest Editorial Special Issue on Flexible Electronics for Emerging Markets and Developing Economies

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2023年第5期2卷 333-335页

作者： Iyer, S. Sundar Kumar Badhulika, Sushmee Bandyapadhyay, Dipankar Dhawan, Anuj Kim, Deok-Kee Narayan, K.S. Ramamurthy, Praveen Indian Institute of Technology Kanpur Department of Electrical Engineering Kanpur208016 India Indian Institute of Technology Hyderabad Department of Electrical Engineering Hyderabad502285 India Indian Institute of Technology Guwahati Department of Chemical Engineering Guwahati781039 India Indian Institute of Technology Delhi Department of Electrical Engineering New Delhi110016 India Sejong University Department of Electrical Engineering Seoul05006 Korea Republic of Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore560064 India Indian Institute of Science Department of Materials Engineering Bangalore560012 India

Necessity is the mother of invention and any technology gets shaped by the socioeconomic conditions of the environment where it is developed. Flexible electronics technology is a fledgling, but rapidly growing field which will have a significant impact on human societies around the world in the coming years. As this technology takes shape, it will benefit if future users of the technology get involved at the initial stages—to improve the efficacy of the technology and help target its future growth. The emerging markets and developing economies (EMDE) currently have roughly 85% of the world’s population, represent about 80% of the countries, and contribute close to 40% of the gross domestic product and purchasing power—and these numbers are expected to increase in the coming years. Moreover, many of the EMDEs are already increasing investments (both governments and private sector) in generating trained manpower, research, development, and innovation for science and technology. Thus, it will be immensely beneficial if EMDE researchers can get involved in promising newer flexible electronics at the early stages. With its larger population base and increased purchasing powers in the coming years and decades, researchers familiar with EMDE should be able to flag opportunities much earlier, the innovations and ideas that are likely to have large-scale applications. Through this Special Issue (SI), IEEE Journal on Flexible Electronics (J-FLEX) hopes to tap into this potential.

关键词： Special issues and sections Flexible electronics Market research Market opportunities Product development Social implications of technology Economics

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Automated Phase and Orientation Mapping of Multiphase, Polycrystalline Hafnia-Zirconia Thin Films Using 4D-STEM

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 300-302页

作者： Baucom, Garrett Hershkovitz, Eitan Sondhi, Kartik Nishida, Toshikazu Kim, Honggyu Department of Materials Science & Engineering University of Florida Gainesville FL United States Department of Electrical & Computer Engineering University of Florida Gainesville FL United States

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