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SSRN 2024年

作者： Ramakrishnan, Vishnuraj Unnathpadi, Rajesh Rangarajan, Murali Pullithadathil, Biji Nanosensors & Clean Energy Laboratory PSG Institute of Advanced Studies Peelamedu Coimbatore641004 India Center of Excellence in Advanced Materials and Green Technologies Amrita School of Engineering Coimbatore Amrita Vishwa Vidyapeetham 641112 India Department of Chemical Engineering and Materials Science Amrita School of Engineering Amrita Vishwa Vidyapeetham Coimbatore641112 India Gurukripa Electrolyzers Private Limited Coimbatore641046 India

Detection of toxic gases stands in foremost significance along with emerging needs of ecological concerns and welfare issues. Herein, solvothermal synthesis of 1D n-In2O3@n-WO3 heterojunction nanowires (HNWs) and their NO2 gas sensing characteristics have been reported. The n-In2O3@n-WO3 HNWs has been well-characterized using XRD, Raman spectroscopy, XPS, SEM and HRTEM. The NO2 sensing performance of n-In2O3@n-WO3 HNWs showed superior performance than pristine WO3 NWs. Due to the distinctive configuration of WO3-In2O3 heterojunctions, the n-In2O3@n-WO3 HNWs demonstrated remarkable sensitivity reaching 456% in response towards 500 ppb of NO2 gas at operating temperature of 200°C. This sensitivity is nearly 2.2 times greater than the response observed with pristine WO3 (204%). Moreover, the n-In2O3@n-WO3 HNWs also exhibited fast response (8-13s)/recovery(54-62s) time characteristics and a plausible sensing mechanism has been discussed. The enhancement in sensor characteristics results shows that n-In2O3@n-WO3 HNWs could serve as a promising material for high-performance NO2 gas sensors for real-time environmental applications. © 2024, The Authors. All rights reserved.

关键词： Nanowires

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Unified One-Parameter Scaling Function for Anderson Localization Transitions in Nonreciprocal Non-Hermitian Systems

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Physical Review Letters 2025年第17期134卷 176301-176301页

作者： C. Wang Wenxue He X. R. Wang Hechen Ren Center for Joint Quantum Studies and Department of Physics School of Science Tianjin University Tianjin 300350 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of Science Tianjin University Tianjin 300072 China Physics Department The Hong Kong University of Science and Technology (HKUST) Clear Water Bay Kowloon Hong Kong School of Science and Engineering Chinese University of Hong Kong (Shenzhen) Shenzhen 51817 China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin University Binhai New City Fuzhou 350207 China

Using dimensionless conductances as scaling variables, the conventional one-parameter scaling theory of localization fails for nonreciprocal non-Hermitian systems such as the Hatano-Nelson model. Here, we propose a one-parameter scaling function using the participation ratio as the scaling variable. Employing a highly accurate numerical procedure based on exact diagonalization, we demonstrate that this one-parameter scaling function can describe Anderson localization transitions of nonreciprocal non-Hermitian systems in one and two dimensions of symmetry classes AI and A. The critical exponents of correlation lengths depend on symmetries and dimensionality only, a typical feature of universality. Then, we derive a complex-gap equation based on the self-consistent Born approximation to determine the critical disorder at which the point gap closes. The obtained critical disorders perfectly match those given by the one-parameter scaling function. Moreover, we propose a one-parameter β function that can describe the critical properties of such Anderson localization transitions. Finally, we show that the one-parameter scaling function is also valid for Anderson localization transitions in reciprocal non-Hermitian systems such as the two-dimensional class AII† and can, thus, serve as a unified scaling function for disordered non-Hermitian systems.

关键词： Born approximation

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Exotic Magnetism in Perovskite KOsO3

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Physical Review Letters 2024年第15期132卷 156701-156701页

作者： Jie Chen Hongze Li Javier Gainza Angel Muñoz Jose A. Alonso Jue Liu Yu-Sheng Chen Alexei A. Belik Kazunari Yamaura Jiaming He Xinyu Li John B. Goodenough J.-S. Zhou Materials Science and Engineering program Mechanical Engineering University of Texas at Austin Austin Texas 78712 USA Instituto de Ciencia de Materiales de Madrid CSIC Cantoblanco E-28049 Madrid Spain Universidad Carlos III Avenida Universidad 30 E-28911 Leganés-Madrid Spain Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA NSF’s ChemMatCARS The University of Chicago Chicago Illinois 60437 USA Research Center for Materials Nanoarchitectonics (MANA) National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki 305-0044 Japan Graduate School of Chemical Sciences and Engineering Hokkaido University North 10 West 8 Kita-ku Sapporo Hokkaido 060-0810 Japan

A new perovskite KOsO3 has been stabilized under high-pressure and high-temperature conditions. It is cubic at 500 K (Pm−3m) and undergoes subsequent phase transitions to tetragonal at 320 K (P4/mmm) and rhombohedral (R−3m) at 230 K as shown from refining synchrotron x-ray powder diffraction (SXRD) data. The larger orbital overlap integral and the extended wave function of 5d electrons in the perovskite KOsO3 allow to explore physics from the regime where Mott and Hund’s rule couplings dominate to the state where the multiple interactions are on equal footing. We demonstrate an exotic magnetic ordering phase found by neutron powder diffraction along with physical properties via a suite of measurements including magnetic and transport properties, differential scanning calorimetry, and specific heat, which provide comprehensive information for a system at the crossover from localized to itinerant electronic behavior.

关键词： Magnetic interactions Magnetic order Antiferromagnets Density functional theory First-principles calculations Neutron diffraction Sintering

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Glucose-Assisted Hydrothermal Synthesis of Hierarchical Mos2/C Structures with Expanded Interlayer Spacing and 1t/2h Hybrid Phases for Enhanced Lithium and Sodium Storage

SSRN

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SSRN 2025年

作者： Yang, Yang Hu, Wenchao Liu, Fangfang Li, Aijun Huang, Dubin Zou, Ruqiang School of Materials Science and Engineering Academy for Advanced Interdisciplinary Studies Peking University Beijing100871 China School of Advanced Materials Shenzhen Graduate School Peking University Shenzhen518055 China School of Materials Science and Physics China University of Mining and Technology Xuzhou221116 China Golden Feather New Energy Technology Co. Ltd. Beijing100095 China Peking University China

Molybdenum disulfide (MoS2)-based lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) encounter significant challenges related to ion diffusion and electron transfer, largely due to limited interlayer spacing and poor conductivity. In this study, we successfully anchor 1T/2H-phase hybrid MoS2 nanosheets onto the surface of template carbon nanotubes using a simple glucose-assisted hydrothermal method, resulting in a hierarchical porous structure. The expansion of interlayer spacing occurred due to the formation of 1T-phase MoS2 and the alternate intercalation of carbon monolayers between the adjacent MoS2 monolayers. Electrochemical evaluations of the 1T/2H-MoS2/C3 sample as a LIB anode demonstrate a reversible discharge capacity of 926.7 mAh·g-1 after 100 cycles at 0.2 A·g-1, retaining 615.9 mAh·g-1 at 5 A·g-1. For SIBs, the material exhibits a reversible discharge capacity of 439.4 mAh·g-1 at 0.2 A·g-1 after 100 cycles, with a rate capacity of 275.9 mAh·g-1 at 5 A·g-1. The outstanding electrochemical performance is attributed to the incorporation of 1T-phase MoS2, expanded interlayer spacing, the MoS2/C intercalated structure, and the hierarchical porous architecture, which collectively reduce ion diffusion barriers, shorten ion diffusion pathways, and enhance conductivity. © 2025, The Authors. All rights reserved.

关键词： Sodium-ion batteries

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Emergent Magnetic Phases and Piezomagnetic Effects in MnxNi1−xF2 Thin Film Alloys

arXiv

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arXiv 2023年

作者： Van Haren, Ryan Hald, Nessa Lederman, David Department of Physics University of California Santa Cruz Santa CruzCA95064 United States Materials Science and Engineering Program School for Engineering of Energy Matter and Transport Arizona State University TempeAZ85287 United States

The effect of random competing single-ion anisotropies in antiferromagnets was studied using epitaxial MnxNi1−xF2 antiferromagnetic thin film alloys grown via molecular beam epitaxy. The crystal structure of this material is tetragonal for all values of x, and the Mn sites have a magnetic easy axis single-ion anisotropy while the Ni sites have an easy plane anisotropy perpendicular to the Mn easy axis. Crystallographic and magnetization measurements demonstrated that the thin film alloys were homogeneously mixed and did not phase-separate into their constituent parts. Pure MnF2 thin films epitaxially grown on MgF2 exhibited compressive strain along all three crystallographic axes which resulted in piezomagnetic effects. The piezomagnetism disappeared if the film was grown on a (MnNi)F2 graded buffer layer. A mean-field theory fit to the transition temperature as a function of the Mn concentration x, which takes into account piezomagnetic effects, gave a magnetic exchange constant between Mn and Ni ions of JMnNi = 0.305±0.003 meV. Mean-field theory calculations also predicted the existence of an oblique antiferromagnetic phase in the MnxNi1−xF2 alloy which agreed with the experimental data. A magnetic phase diagram for MnxNi1−xF2 thin film alloys was constructed and showed evidence for the existence of two unique magnetic phases, in addition to the ordinary antiferromagnetic and paramagnetic phases: an oblique antiferromagnetic phase, and an emergent magnetic phase proposed to be either a magnetic glassy phase or a helical phase. The phase diagram is quantitatively different from that of FexNi1−xF2 because of the much larger single-ion anisotropy of Fe2+ compared to Mn2+ © 2023, CC BY.

关键词： Ions

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Systematic literature review on the design, efficiency and fabrication of wind turbine blades

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International Journal of Ambient Energy 2024年第1期45卷

作者： Almalki, Hussam Safaei, Babak Karimzadeh Kolamroudi, Mohammad Sahmani, Saeid Arman, Samaneh Shekoofa, Omid Eastern Mediterranean University Famagusta Turkey Department of Mechanical Engineering Eastern Mediterranean University Famagusta Turkey UNESCO-UNISA Africa Chair in Nanosciences and Nanotechnology College of Graduate Studies University of South Africa Pretoria South Africa Department of Mechanical Engineering Near East University Nicosia Turkey Near East University Nicosia Turkey Department of Civil Engineering School of Science and Technology The University of Georgia Tbilisi Georgia Center for Advanced Materials and Structures School of Science and Technology The University of Georgia Tbilisi Georgia

As one of the most prominent types of renewable energy, wind energy has become increasingly popular around the world. Investment in this sector is highly reasonable and sustainable since it can provide a continuous and stable energy source to produce limitless electricity with no air pollutants and greenhouse gas emissions. Wind turbines use an electromechanical mechanism based on generator rotation to convert wind kinetic energy to electricity. The current study investigated various wind turbine (WT) types, focusing on their blade materials, applications, characteristics and manufacturing processes. In addition, in this research, relevant literature were reviewed, and progresses in the blades of wind turbines in different sectors were comprehensively assessed through the classification of previous studies and combining numerical and analytical studies. This overview explores various types of WT blades and the factors that influence their efficiency, which can assist in enhancing WT design and performance. The findings of this review suggest that one developed turbine (which boasts the advantages of being lightweight, highly efficient and low-noise) with a greater capacity can replace several smaller turbines. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Fabrication

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Wavelength-Dependent Solar N_(2) Fixation into Ammonia and Nitrate in Pure Water

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Research 2020年第1期2020卷 581-592页

作者： Wenju Ren Zongwei Mei Shisheng Zheng Shunning Li Yuanmin Zhu Jiaxin Zheng Yuan Lin Haibiao Chen Meng Gu Feng Pan School of Advanced Materials Peking UniversityShenzhen Graduate SchoolChina School of Advance Manufacturing Engineering Chongqing University of Posts and TelecommunicationsChongqingChina Department of Materials Science and Engineering Southern University of Science and TechnologyChina SUSTech Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyChina Institute of Chemistry Chinese Academy of SciencesBeijingChina

Solar-driven N_(2) fixation using a photocatalyst in water presents a promising alternative to the traditional Haber-Bosch process in terms of both energy efficiency and environmental *** present,the product of solar N_(2) fixation is either NH_(4)^(+)or NO_(3)^(-).Few reports described the simultaneous formation of ammonia(NH_(4)^(+))and nitrate(NO_(3)^(-))by a photocatalytic reaction and the related *** this work,we report a strategy to photocatalytically fix nitrogen through simultaneous reduction and oxidation to produce NH_(4)^(+)and NO_(3)^(-)byW18O49 nanowires in pure *** underlying mechanism of wavelength-dependent N_(2) fixation in the presence of surface defects is proposed,with an emphasis on oxygen vacancies that not only facilitate the activation and dissociation of N_(2) but also improve light absorption and the separation of the photoexcited *** NH_(4)^(+)and NO_(3)^(-)can be produced in pure water under a simulated solar light and even till the wavelength reaching 730 *** maximum quantum efficiency reaches 9%at 365 *** calculation reveals that disproportionation reaction of the N_(2) molecule is more energetically favorable than either reduction or oxidation *** is worth noting that the molar fraction of NH_(4)^(+)in the total product(NH_(4)^(+)plus NO_(3)^(-))shows an inverted volcano shape from 365nm to 730 *** increased fraction of NO_(3)^(-)from 365 nm to around 427 nm results from the competition between the oxygen evolution reaction(OER)at W sites without oxygen vacancies and the N_(2) oxidation reaction(NOR)at oxygen vacancy sites,which is driven by the intrinsically delocalized photoexcited *** 427nm to 730 nm,NOR is energetically restricted due to its higher equilibrium potential than that of OER,accompanied by the localized photoexcited holes on oxygen *** disproportionation of N_(2) is achieved within a range of wavelength from~427nm to~515 *** work presents a rati

关键词： mechanism excited catalyst

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A novel strategy towards the fabrication of highly stable and sensitive non-enzymatic glucose sensor based on Ni3N thin films using high power impulse magnetron sputtering

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Applied Surface science 2024年 669卷

作者： Pardhi, Nishchal Cheng, Wei-Chun Chen, Sheng-Chi Akshay Joshi, Shikha Govindasamy, Mani Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Materials Engineering and Center for Plasma and Thin Film Technologies Ming Chi University of Technology New Taipei City243303 Taiwan College of Engineering and Center for Green Technology Chang Gung University Taoyuan333 Taiwan Department of Materials Engineering Indian Institute of Science Bangalore560012 India International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan Tamil Nadu Chennai602105 India Research Center for Intelligence Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan

Glucose level surveillance in mankind is considered the greatest need of recent times to achieve healthy lifestyle goals due to its health-related concern for humans. To fulfill the need, Nickel-based compounds emerge with excellent bio-mimic properties. However, due to the poor electrical properties of oxides and hydroxides of Ni, developing a supporting base that can enhance electron transportation is mandatory. The present work is dedicated to non-enzymatic glucose detection by electrochemical means on the Ni3N thin film on an Indium-doped Tin Oxide (ITO) substrate as a working electrode in an alkaline medium. The Ni3N films use HiPIMS as a deposition technique due to its high ionization rate of sputtered species and dense plasma which helps the Ni ions to react with nitrogen in the formation of a perfect Ni3N phase, and it is a green process that can contribute to sustainable manufacturing. Ni3N thin film deposited at a 60 % N2 flow ratio shows the largest crystallinity and catalytic properties, which helps this modified electrode to have significant potential for glucose detection. The Ni3N modified electrode acquires a lower linear range of 0.001–1.25 mM with sensitivity and Limit of Detection (LOD) of 337.46 µAmM–1cm−2, and 0.78 µM, respectively, and a higher linear range of 1.25–7.3161 mM with a sensitivity of 158.58 µAmM–1cm−2. The amperometric measurements reveal the fast response of the electrode towards glucose detection at 2.46 secs. The key measures of the electrode according to the corresponding measurements are satisfactory selectivity, reproducibility, repeatability, and operational stability. The modified electrode shows a significant response for real samples such as commercially available honey, apple juice, and biological fluids. © 2024 Elsevier B.V.

关键词： Thin films

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A metallated graphene oxide foam with a carbon nanotube shell for an enhanced capacitance device †

RSC Applied Interfaces

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RSC Applied Interfaces 2024年第3期1卷 483-491页

作者： Rahul Patil Lingaraj Pradhan Electrochemical Energy & Sensor Research Laboratory Amity Institute of Click Chemistry Research & Studies Amity University Noida India Materials Chemistry Department CSIR-Institute of Minerals and Materials Technology Bhubaneswar India Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan Materials Research Laboratory Department of Physics Indian Institute of Technology Jammu Jammu India Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taoyuan Taiwan

Single and multimetallic interfacial sites are promising for enhancing current density, power density, and capacitance. Graphene-based composites with a three-dimensional (3D) foam architecture and metal incorporation are prospective materials to investigate the migration of electrons along the interfaces of nanotube architecture. We present a fabrication strategy for metallated reduced graphene oxide foam (M-rGO foam) grown as a single piece using a graphene suspension and multi-walled carbon nanotube (MWCNT)-like tubular structure-containing trimetallic (Ni, Co, and Zn) zeolitic imidazolate framework derived NC at 700 °C (C-ZIF-700-NC) as the parent material with rich metal-doped interfaces. During the formation of the composite between graphene oxide and M-ZIF-700 NC, l -ascorbic acid acts as a reducing agent in an aqueous medium at 75 °C for 8 h. The M-rGO foam architecture incorporates metal nanoparticles, such as cobalt, nickel, and zinc, for capacitance enhancement because of possible ionic conductivity in the hierarchical metallated interface architecture. The M-rGO foam delivers an outstanding gravimetric capacitance of 1013.47 F g −1 at a scan rate of 5 mV s −1 and retains an extraordinary gravimetric capacitance of 450.81 F g −1 even at a higher scan rate of 100 mV s −1 with high-rate capability. It has a prolonged capacitance retention of 94% at 10 000 cycles. The symmetric supercapacitor device (SSD) of the M-rGO foam achieved an ultrahigh energy density of 44.93 Wh kg −1 at a power density of 749.9 W kg −1 .

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Simulation of Gap Structure Optical Waveguide with Phase Change materials

Simulation of Gap Structure Optical Waveguide with Phase Cha...

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Jinxuan Liang Zhuoxuan Zhu Yida Dong Lei Lei Yida Li Mei Shen X.-D. Xiang Department of Materials Science and Engineering Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology Shenzhen China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen China School of Microelectronics Southern University of Science and Technology Shenzhen China

Optical phase change material (O-PCM) have attracted extensive attention due to its large change in optical properties between phase transitions. Its application in rewritable non-volatile photonic devices is extremely interesting except the drawback of moderate loss induced by the O-PCM. In this work, a “gap” structure waveguide device with an O-PCM layer is proposed to simulate the optical propagation in both amorphous and crystalline state. The effective refractive indices $(\mathbf{n}_{\text{eff}})$ , losses $(\alpha)$ and figure-of-merits (FOMs) are obtained by simulations for Ge 2 Sb 2 Te 5 (GST), GeS, Sb 2 S 3 , Sb 2 Se 3 and Ge 2 Sb 2 Se 4 Te (GSST). The results indicate the “gap” structure have effectively mitigated the propagation loss induced by the O-PCM. By comparing the results for different materials, we find that GeS and Sb 2 S 3 are the most effective modulation candidates in the propagation of TM-polarized and TE-polarized light, respectively.

关键词： Phase change materials Optical losses Optical variables control Optical materials Optical refraction Optical modulation Integrated circuit modeling

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