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Dominant p-wave pairing induced by nearest-neighbor attraction in the square-lattice extended Hubbard model

Physical Review B 2025年第2期111卷 024509-024509页

作者： Zhangkai Cao Jianyu Li Jiahao Su Tao Ying Ho-Kin Tang School of Science Harbin Institute of Technology Shenzhen 518055 China Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Shenzhen 518055 China School of Physics Harbin Institute of Technology Harbin 150001 China

The two-dimensional Hubbard model is widely believed to capture the key ingredients of high-temperature superconductivity in cuprate materials. Here we report a constrained path quantum Monte Carlo study of the square-lattice extended Hubbard model with on-site Coulomb repulsion U and nearest-neighbor (NN) electron attraction V. Upon doping δ = 0.125, we find that NN electron attraction V significantly promotes an exotic spin-triplet (p-wave) pairing, with the p-wave pairing correlations growing stronger as V increases. Meanwhile, the dx2−y2-wave (d-wave) pairing in the intermediate coupling regime shows an insignificant response to the increase of V. The spin density wave order, which is observed near half filling in the particle-hole channel, is also almost unaffected by the NN electron attraction V, reinforcing the established relationship between d-wave superconductivity (SC) and spin order. As the doping becomes heavier (i.e., δ increases), the dominant region of p-wave pairing expands, further suppressing the presence of d-wave pairing. Our paper suggests the p-wave pairing region can be induced and further broadened by the NN electron attraction V, offering a feasible mechanism to realize p-wave SC in realistic cuprate materials.

关键词： Hubbard model

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High-temperature long-term oxidation resistance of SiCf/SiC-TaB2 composites fabricated by organic-inorganic hybrid precursor infiltration and pyrolysis process

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Corrosion science 2025年 254卷

作者： Lv, Haozhong Zhu, Shipeng Tang, Yilin Zhang, Boya Sun, Wenting Yang, Yunhua Li, Junping Li, Junning Ge, Min Zhang, Weigang Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials & Processing Technology Beijing100076 China State Key Laboratory of Mesoscience and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

As an ideal material for high-performance aeroengines, silicon carbide ceramic matrix composites (SiC-CMCs) still face challenges such as degradation due to high-temperature oxidation and limitations of traditional processing methods. In this study, the SiCf/SiC-TaB2 composites were fabricated using an organic-inorganic hybrid process combining precursor infiltration and pyrolysis (PIP) and slurry infiltration (SI) techniques. Analysis of both non-isothermal and isothermal oxidation behaviors revealed that the incorporation of TaB2 particles substantially improves the oxidation resistance of SiC-CMCs over a wide temperature range. Moreover, a critical finding is the structural evolution of Ta2O5, formed from the oxidation of TaB2, which transitions from grainy to flaky and eventually to a layered structure, significantly contributing to the composites' long-term oxidation resistance. Compared with the conventional SiCf/SiC composites, the mass change of the SiCf/SiC-TaB2 composites decreased by 34.8 %, 52.0 %, and 86.2 % after oxidation at 1200°C, 1300°C, and 1400°C for 100 hours, respectively. Meanwhile, the strength retention of the composites increased by 6.61 %, 13.90 %, and 6.87 % at these temperatures. These findings underscore the efficacy of the organic-inorganic hybrid precursor infiltration and pyrolysis process in producing high-performance SiC-CMCs with enhanced oxidation resistance and mechanical durability. © 2025 Elsevier Ltd

关键词： Organic-inorganic materials

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Green Synthesis of High-Performance Conjugated Polymers through Optimizing Fused-Ring Structures and Molecular Weights for Organic Field-Effect Transistors

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ACS Applied Materials and Interfaces 2025年第21期17卷 31183-31191页

作者： Hua, Yu Kim, Hoimin Ruan, Zeng Kang, Boseok Zhang, Guobing Ding, Yunsheng School of Chemistry and Chemical Engineering Hefei University of Technology Key Laboratory of Advance Functional Materials and Devices Anhui Province National Engineering Lab of Special Technology Hefei 230009 China SKKU Advanced Institute of Nanotechnology (SAINT) Department of Nano Science and Technology Sungkyunkwan University (SKKU) Suwon 16419 South Korea Department of Nano Engineering Department of Semiconductor Convergence Engineering Sungkyunkwan University (SKKU) Suwon 16419 South Korea

Facile and ecofriendly syntheses are of vital importance to the development of organic semiconductors. Herein, we present a straightforward and green approach for preparing high-performance conjugated polymers. A series of conjugated polymers based on three commercially available multifused rings and benzodifuranedione were designed and synthesized for application in organic field-effect transistors (OFETs). The optical properties, molecular orbital energy levels, and microstructures were systematically investigated. Polymer-based field-effect devices were also fabricated and the electrical properties were optimized by extending the conjugation length, varying the multifused ring structures, and enhancing the molecular weight. The conjugated polymer featuring heptacyclic arenes (dithienothiophen[3,2-b]-pyrrolobenzothiadiazole) achieved a maximum mobility exceeding 1.4 cm² V^-1 s^-1 and an I_on/I_off ratio surpassing 10⁶. This work presents a green aldol synthesis strategy for the preparation of high-performance polymer semiconductor materials. © 2025 American Chemical Society.

关键词： aldol condensation conjugated polymers field-effect transistors green synthesis multifused rings

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High-temperature effects on the compressive behaviors of SiC-coated carbon-bonded carbon fiber composites: Insights into mechanical properties and cyclic deformation recovery

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Journal of Materials Research and technology 2025年 36卷 8264-8276页

作者： Zhinan Li Tongqi Li Tong Xia Yixing Qian Zhenyu Yang Zixing Lu National Key Laboratory of Strength and Structural Integrity School of Aeronautic Science and Engineering Beihang University (BUAA) Beijing 100191 PR China National Key Laboratory of Advanced Functional Composite Material Technology Beijing 100076 PR China Beijing Electro-Mechanical Engineering Institute Beijing 100079 PR China Aircraft & Propulsion Laboratory Ningbo Institute of Technology (NIT) Beihang University (BUAA) Ningbo 315832 PR China

Porous SiC-coated carbon-bonded carbon fiber composites (SiC-coated CBCFs) are fabricated via chemical vapor deposition (CVD) method, where silicon carbide coatings are uniformly applied to carbon fibers bonded by pyrolytic carbon while preserving their three-dimensional interconnected pore structure. The mechanical responses of SiC-coated CBCFs under elevated temperatures are systematically characterized through quasi-static compression testing coupled with multiscale microstructural analysis. The results demonstrate a monotonic decrease in elastic moduli as temperature increases to 2000 °C. In contrast, compressive strengths initially rise and then experience a slight fluctuation before the significant decrease. Under stepwise cyclic compressive loading, both the deformation recovery ability and load-bearing stiffness exhibit notable degradation at elevated temperatures, highlighting the need for larger safety margins in realistic thermal insulation scenarios. These findings establish quantitative correlations between thermomechanical degradation mechanisms and operational limits, offering valuable insights for their design and application in reusable high-performance systems.

关键词： Carbon-bonded carbon fiber composites (CBCFs) SiC coatings High temperature Compressive mechanical properties Deformation recovery ability

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Lead-Free Scintillator Based on a Luminescent Green-Emitting Material Derived from Manganese(II) Chloride for High-Resolution X-Ray Imaging

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Journal of Inorganic and Organometallic Polymers and Materials 2025年 1-8页

作者： Zheng, Xiaokang Tao, Peng Wang, Hua Zhang, Lijie Wong, Wai-Yeung MOE Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan030024 China Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University Hung Hom Hong Kong The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen518057 China College of Textile Engineering Taiyuan University of Technology Jinzhong030600 China Zhejiang International Joint Laboratory of Optical Functional Materials Wenzhou University Wenzhou325000 China

Manganese(II) halides have attracted significant research attention because of their unique zero-dimensional structures, low toxicity, structural diversity, and tunable photoluminescent properties. However, the development of neutral manganese(II) chlorides has lagged behind their manganese(II) bromide counterparts in X-ray imaging applications. Herein, we report a green-emitting neutral monodentate manganese(II) chloride complex (H-Cl) by introducing the cyclohexyldiphenylphosphine oxide as the ligand, which could be synthesized via a simple room-temperature solvent evaporation method. Complex H-Cl exhibits bright photoluminescence with an emission peak at 516 nm with a full-width at half-maximum (FWHM) of 61 nm, and achieves a photoluminescence quantum yield (PLQY) of 16.69%, surpassing most reported neutral monodentate manganese(II) chlorides. As an X-ray scintillator, complex H-Cl realizes a detection limit of 1.581 µGy/s, which is much lower than that of the standard for X-ray medical diagnostics. It also shows a high spatial resolution exceeding 9.6 lp/mm, highlighting its potential for advanced scintillator design and high-resolution X-ray imaging technology. © The Author(s) 2025.

关键词： Scintillation counters

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Controlled synthesis of silicon carbide whiskers via nickel-based alloy catalyst-assisted carbothermal reduction unraveling vapor-liquid-solid growth and Ni3Si2 droplet dynamics

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Ceramics International 2025年

作者： Chen, Chen Li, Wenhao Zhen, Qiang Li, Rong Zhang, Shaowei Li, Xingchao Wang, Jinming Materials Science and Engineering Shanghai University Shanghai200444 China Nano-Science &Technology Research Center Shanghai University Shanghai200444 China College of Engineering Mathematics and Physical Sciences University of Exeter ExeterEX4 4QF United Kingdom Science and Technology of Advanced Functional Composite Materials Laboratory Aerospace Research Institute of Materials & Processing Technology Beijing100076 China

Silicon carbide whiskers (SiCw) are highly promising for ultra-high-temperature thermal protection systems due to their excellent mechanical properties and heat resistance. However, precisely controlling their size and shape during production remains challenging. This study achieved the controllable preparation of SiC whiskers (70–280 nm in diameter, aspect ratios of 50–300) via nickel-alloy-catalyzed carbothermal reduction. The vapor-liquid-solid (V-L-S) mechanism dominated the growth, with dynamically evolving Ni-Si alloy droplets playing a critical role. Combined experimental and thermodynamic analyses confirmed that Ni3Si2 alloy droplets stabilized above 1000 °C regulated whisker growth through a dual-pathway mechanism: adsorption of CO(g), Si(g), and SiO(g) to drive axial growth while synchronously precipitating amorphous SiO2 layers to suppress radial expansion. First-principles DFT calculations revealed strong adsorption of CO and SiO on the Ni3Si2(101) surface (adsorption energies: 1.459 eV and 2.677 eV), inducing 53.8 % and 49.2 % elongations of C-O and Si-O bonds, respectively. These findings elucidate alloy catalysts' atomic-scale "adsorption-activation-nucleation" mechanism in V-L-S growth and provide critical insights for designing SiCw-reinforced thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Aspect ratio

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Transparent and Extremely Stretchable Piezoelectric Device for Sensors and Energy Harvesters

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ACS Applied Materials and Interfaces 2025年第21期17卷 31499-31510页

作者： He, Jian Qian, Zihao Hu, Zhijun Guo, Mingyu State-Local Joint Engineering Laboratory for Novel Functional Polymer Materials Jiangsu Key Laboratory of Advanced Functional Polymer Materials Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province Key Laboratory of Modern Optical Technologies of Education Ministry of China School of Optoelectronic Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 China

Piezoelectric devices have garnered significant interests due to their dual functionality as both sensors and energy harvesters, as well as the rapid development in Internet of Things (IoT) and artificial intelligence (AI). However, the fabrication of stretchable and transparent piezoelectric devices remains a great challenge, largely due to the inherent crystalline nature of piezoelectric materials and electrodes. In this work, for the first time, we report the fabrication of a highly transparent and stretchable piezoelectric device based entirely on polyurethane-urea (PUU) elastomers/composites. Specifically, nano ZnO hybrid hydrophobic PUU serves as the elastic inner piezoelectric layer;conductive ionic liquid composite hydrophilic PUU forms the middle electrode layer;and hydrophobic PUU elastomer acts as the outer encapsulation layer. The obtained device exhibits exceptional stretchability (elongation at break >1000%) and excellent optical transparency (∼86%). It can generate distinct, stable, and reliable output signals for monitoring both small- and large-scale mechanical motions along with a mechanical energy output of 48 μW m^-2 at a pressure of 38.2 kPa, highlighting its outstanding sensing and energy harvesting capabilities. This work presents valuable new insights into the design and development of novel, reliable, transparent, and stretchable piezoelectric devices, paving the way for the new generation of flexible electronics. © 2025 American Chemical Society.

关键词： energy harvester nano ZnO piezoelectric device polyurethane urea transparent and stretchable sensor

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Tuning of -Phase in PVDF via nickel ferrite incorporation

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Journal of Materials science: Materials in Electronics 2025年第6期36卷 1-18页

作者： Bhoobash, S. B. Behera, C. Advanced Functional Materials Research Laboratory Department of Physics National Institute of Technology (NIT) Agartala India Physics Section Department of Education in Science and Mathematics Regional Institute of Education (NCERT) Bhopal India

Fluoropolymers are fascinating in the high-tech industry due to their widespread applications, including fabricating actuators and sensors, controlling and monitoring storage, and energy generation. In this paper, we have communicated the development of an electroactive β-phase in flexible, lightweight, and thermally stable polymer nanocomposite in the configuration of 93% PVDF-7% NiFe2O4 by weight percentage fabricated via a cost-effective solution-casting technique. XRD, FTIR, and TGA were performed to check the structural and thermal stability of the system. Low loading of nano-nickel ferrite in the PVDF, the composite developed a substantial electroactive β-phase of 85.85% confirmed from FTIR analysis with enhanced thermal stability of 60.2 °C with respect to PVDF, as evident from the TGA study. FESEM, HRTEM, AFM, EDAX, and elemental mapping have been performed to study the microstructural and surface topology of the developed composite quantitatively and qualitatively. AFM study confirms the size of the spherulitics modulated to 7.4 μm as compared to 2.9 μm of PVDF referred to enhance thermal and mechanical stability along with increased β-phase. UV–visible spectroscopy study reveals the composite’s optical band gap to be 3.46 eV. The ambient condition’s capacitive, resistive, conductive, switching, and magnetic characteristics have been studied to exploit their properties for suitable device inclusion, including flexible electronics. The composite possesses a saturation polarisation of 1.5790 µC/cm2, remnant polarisation of 0.3725 µC/cm2, and a coercive field of 60.45 kV/cm at room temperature, which is useful for energy storage devices. The room-temperature ferrimagnetism suggests the composite’s application in multifunctional devices with a first-order magneto-electric (αME) coefficient of 11 mV/***.

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Densification, microstructure, and mechanical properties of WMo–Al2O3 alloy fabricated by spark plasma sintering

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Ceramics International 2025年

作者： Cui, Liya Wang, Changji Wei, Shizhong Dou, Caihong Zhao, Ziwen Chen, Chong Dong, Di Pan, Kunming School of Materials Science and Engineering Henan University of Science and Technology Luoyang471000 China Longmen Laboratory Luoyang471000 China Henan Key Laboratory of High-temperature Structural and Functional Materials Henan University of Science and Technology Luoyang471003 China Advanced Technology & Materials Co. Ltd Beijing100081 China

In the spark plasma sintering process, different sintering temperatures (1500–1900 °C) and sintering times (6–20 min) were used for the consolidation of WMo–Al2O3 powder. The results show that the highest relative density of the WMo–Al2O3 alloy was stable at 96 % when the sintering temperature was 1600 °C and the holding time was 10 min;under these conditions, the alloy had no obvious change in phases and a grain size of 0.73 μm. The stress exponent (n) of the diffusion process was less than 0.5, indicating that the densification mechanism of WMo–Al2O3 alloy is atomic diffusion between grain boundaries and particle rearrangement caused by grain boundary slip. The microhardness of the WMo–Al2O3 alloy first increased and then decreased with increasing temperature, which was attributed to the low density, resulting in low microhardness at low sintering temperatures. In addition, the microhardness increased with increasing relative density. When the temperature was further increased and the relative density remained unchanged, the WMo–Al2O3 alloy grain size increased and the hardness decreased. Under holding at 1600 °C for 10 min, the grain size was 0.73 μm, the hardness reached 721.3 HV, and the relative density reached 96.45 %. A transition layer existed in the interface region between the WMo solid solution and the Al2O3 particles, formed by mutual diffusion and reaction between the Al2O3 particles and the WMo matrix. The phase boundary indicated a good combination of Al2O3 particles with the WMo matrix, and the width of the interface bonding region was approximately 5 nm. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Densification

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Strain-enhanced dynamic regulation of chiroptical responses in 3D suspended nested metamaterials

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Optics Express 2025年第11期33卷 23440-23451页

作者： Bo Li ShiLong Duan QiuShun Zou RuanSheng Guo YiMin Chen ChenJie Gu PeiQing Zhang Xiang Shen Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo 315211 China Laboratory of Infrared Material and Devices Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices Advanced Technology Research Institute Ningbo University Zhejiang 315211 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei Anhui 230027 China

Three-dimensional (3D) chiral metamaterials, which exhibit strong chiroptical responses, have attracted tremendous attention in the broad fields of next-generation photonic devices and chiroptical spectroscopy techniques. There is an urgent need for a novel fabrication approach that enables the rapid and straightforward preparation of 3D chiral nanostructures, along with a robust strategy for achieving dynamic regulation. Here, we proposed a strain-enhanced strategy for dynamically regulating the chiroptical responses of 3D suspended nested metamaterials from the transformation of a 2D precursor. The local strain enhancement could effectively resolve the bottleneck of insufficient strain and low precision for the buckling strain self-assembly. The changing morphology and circular dichroism (CD) of 3D suspended chiral metamaterials were analyzed under the impact of a strain-enhanced effect. Then, the uplifted heights of these 3D nanostructures increased with the substrate's pre-strain ( ɛ pre ). Its CD reached up to 0.79, mainly resulting from ring electric dipoles. Interestingly, the chiroptical responses of 3D nanopyramids were regulated dynamically by controlling the substrate's pre-strain. Such a strategy provides a new pathway for achieving high-performance chiral metamaterials and offers promising applications in circularly polarized light detection, super-chiral light sources, optical communication, and advanced nanophotonic systems.

关键词： Holographic displays Luminescent materials Negative index materials Optical properties Photonic devices Refractive index

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