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Enhanced Magnetic Interaction between Ga and Fe in Two-Dimensional van der Waals Ferromagnetic Crystal Fe_(3)GaTe_(2)

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Chinese Physics Letters 2023年第8期40卷 108-112页

作者：查鹤鸣李炜张高节刘文晶邓力玮姜琦叶茂武浩常海欣乔山 State Key Laboratory of Functional Materials for Informatics Center for Excellence in Superconducting ElectronicsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Physics and State Key Laboratory of Surfac Physics Fudan UniversityShanghai 200433China State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Fe_(3)GaTe_(2),a recently discovered van der Waals ferromagnetic crystal with the highest Curie temperature and strong perpendicular magnetic anisotropy among two-dimensional(2D)magnetic materials,has attracted significant attention and makes it a promising candidate for next-generation spintronic *** with Fe_(3)GeTe_(2),which has the similar crystal structure,the mechanism of the enhanced ferromagnetic properties in Fe_(3)GaTe_(2)is still unclear and needs to be ***,by using x-ray magnetic circular dichroism measurements,we find that both Ga and Te atoms contribute to the total magnetic moment of the system with antiferromagnetic coupling to Fe *** first-principles calculations reveal that Fe_(3)GaTe_(2)has van Hove singularities at the Fermi level in nonmagnetic state,resulting in the magnetic instability of the system and susceptibility to magnetic phase *** addition,the calculation results about the density of states in ferromagnetic states of two materials suggest that the exchange interaction between Fe atoms is strengthened by replacing Ge atoms with Ga *** findings indicate the increase of both the itinerate and local moments in Fe_(3)GaTe_(2)in view of Stoner and exchange interaction models,which results in the enhancement of the overall magnetism and a higher Curie *** work provides insight into the underlying mechanism of Fe_(3)GaTe_(2)’s remarkable magnetic properties and has important implications for searching 2D materials with expected magnetic properties in the future.

关键词： magnetic ferromagnetic mechanism

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Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang Fei Long Liyuan Han Qifeng Han Yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination

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Conductive ionic liquid/chitosan hydrogels for neuronal cell differentiation

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Engineered Regeneration 2022年第1期3卷 1-12页

作者： Wenwu Wang Likun Chang Yichun Shao Dan Yu Jayanti Parajuli Chao Xu Guoliang Ying Ali K.Yetisen Yixia Yin Nan Jiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China College of Life Science and Technology Huazhong University of Science and Technology Wuhan 430074 China West China School of Basic Medical Sciences&Forensic Medicine Sichuan UniversityChengdu 610041China Department of Chemical Engineering Imperial College LondonLondon SW72AZUK

To regulate cell behaviors and promote nerve function recovery,three-dimensional(3D)conductive hydrogel can transmit intercellular electrical signals,and effectively provide the cell survival ***,produc-ing hydrogels with simultaneous high conductivity,favorable biocompatibility,and tissue-matching properties remains a challenge for spinal cord injury(SCI)***,a conductive,multifunctional,and biocompati-ble VPImBF4 ionic liquid(IL)with photosensitive chitosan-based hydrogel(pCM@IL)is *** pCM@IL hydrogel exhibits a 3D microporous structure that could maintain cell viability and improve cell ***-tic modulus,conductivity,and biodegradability of the pCM@IL hydrogels are investigated with tissue-matching mechanical *** pCM@IL conductive hydrogels synergistically enhance neuronal cell proliferation and promote neuronal cells differentiation via upregulates synapse gene(Tubulin𝛽3,GAP43,Synaptophysin)***,in vivo studies of the pCM@IL conductive hydrogels as implants demonstrate low-inflammation and neovascularize promotion and appropriate biodegradable *** developed pCM@IL conductive hydrogel is a promising therapeutic scaffold biomaterial for SCI repair.

关键词： Ionic liquid Chitosan conductive hydrogels Neural differentiation Spinal cord injury

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Bending and Vibration Analysis of Multi-Directional Functionally Graded Thick Plates Described by Trigonometric Functions Via a Novel Third-Order Shear Deformation Theory and Isogeometric Analysis

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SSRN 2023年

作者： Chen, Fei Zhao, Xiaofei Huang, Zhifeng Lei, Jun Zhang, Chi Wen, Pin Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Wuhan430070 China Department of Engineering Mechanics Faculty of Materials and Manufacturing Beijing University of Technology Beijing100124 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

This paper introduces a material model for a multi-directional functionally graded plate described by trigonometric functions, equipped with four parameters to control diverse material distributions effectively. The bending and vibration analysis of multi-directional functionally graded plates is carried out utilizing the Isogeometric Analysis, which is based on a novel third-order shear deformation theory (TSDT) to account for transverse shear deformation. The present TSDT, founded on a rigorous kinematic of displacements, is demonstrated to surpass other preceding theories. It is derived from an elasticity formulation, rather than relying on the hypothesis of displacements. The effectiveness of the proposed method is verified by comparing its numerical results with those of other methods reported in the relevant literature. Numerical examples are presented and discussed, in which the effects of gradient parameters, periodic parameter, length-to-thickness ratio, and boundary conditions on deflection, stress, and natural frequencies are investigated. © 2023, The Authors. All rights reserved.

关键词： Vibration analysis

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Double crosslinked biomimetic composite hydrogels containing topographical cues and WAY-316606 induce neural tissue regeneration and functional recovery after spinal cord injury

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Bioactive materials 2023年第6期24卷 331-345页

作者： Xingchang Zhao Xianzhe Lu Kai Li Shiqiang Song Zhaohui Luo Chuanchuan Zheng Chengliang Yang Xiumei Wang Liqiang Wang Yujin Tang Chong Wang Jia Liu Department of Orthopaedics Affiliated Hospital of Youjiang Medical University for NationalitiesBaiseGuangxiChina Guangxi Key Laboratory of Basic and Translational Research of Bone and Joint Degenerative Diseases Guangxi Biomedical Materials Engineering Research Center for Bone and Joint Degenerative DiseasesBaiseGuangxiChina Academy of Orthopedics Guangdong ProvinceGuangdong Provincial Key Laboratory of Bone and Joint Degeneration DiseasesThe Third Affiliated Hospital of Southern Medical UniversityGuangzhouChina Youjiang Medical University for Nationalities BaiseGuangxiChina School of Mechanical Engineering Dongguan University of TechnologySongshan LakeDongguanGuangdongChina State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijingChina State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

Spinal cord injury(SCI)is an overwhelming and incurable disabling condition,for which increasing forms of multifunctional biomaterials are being tested,but with limited *** promising material should be able to fill SCI-induced cavities and direct the growth of new neurons,with effective drug loading to improve the local micro-organism environment and promote neural tissue *** this study,a double crosslinked biomimetic composite hydrogel comprised of acellularized spinal cord matrix(ASCM)and gelatin-acrylated-β-cyclodextrin-polyethene glycol diacrylate(designated G-CD-PEGDA)hydrogel,loaded with WAY-316606 to activate canonical Wnt/β-catenin signaling,and reinforced by a bundle of three-dimensionally printed aligned polycaprolactone(PCL)microfibers,was *** G-CD-PEGDA component endowed the composite hydrogel with a dynamic structure with a self-healing capability which enabled cell migration,while the ASCM component promoted neural cell affinity and *** diffusion of WAY-316606 could recruit endogenous neural stem cells and improve neuronal *** aligned PCL microfibers guided neurite elongation in the longitudinal *** behavior studies further showed that the composite hydrogel could significantly recover the motor function of rats after *** study provides a proficient approach to produce a multifunctional system with desirable physiological,chemical,and topographical cues for treating patients with SCI.

关键词： Spinal cord injury 3D printing PCL oriented fibers WAY-316606 Wnt/β-catenin signaling

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Structural Evolution and Thermoelectric Performance in (Gete)M(Sb2te3)N Compounds

SSRN

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SSRN 2024年

作者： Chen, Shuo Liu, Keke Luo, Tingting Liao, Lin Yang, Zhen Zhong, Shenlong Wu, Jinsong Su, Xianli Poudeu, Pierre Ferdinand Poudeu Zhang, Qingjie Tang, Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States

Exploring the relationship between crystal structure and thermoelectric performance is a pivotal topic in the thermoelectric field. In this study, we have conducted a comprehensive investigation on the correlation between the structural evolution of (GeTe)m(Sb2Te3)n pseudo-binary system and the thermoelectric properties. The proportion of van der Waals bonds increase with the rising Sb2Te3 content, resulting in an increase in the anisotropy of the electrical conductivity and a decrease in the average sound velocity. Additionally, the cation sites in the crystal lattice of these compounds exhibit a mixed occupancy of Ge/Sb atoms, although the cation sites adjacent to the van der Waals gaps are predominantly occupied by Sb atoms. The ultra-low lattice thermal conductivity of the GST124 and GST147 compounds is mainly attributed to the high concentration of van der Waals bonds and enhanced phonon scattering arising from Ge/Sb mixed cation occupancy and high density of defect structures. The high electrical conductivity combined with the low lattice thermal conductivity enables GST124 and GST147 compounds to achieve a maximum ZT value of 0.56 and 0.57, respectively. Higher thermoelectric performance can be achieved through optimization of the microstructure as well as the carrier concentration. © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Regulation of Dynamic Recrystallization in p-Type Bi2Te3-Based Compounds Leads to High Thermoelectric Performance and Robust Mechanical Properties

SSRN

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SSRN 2024年

作者： Chen, Shuo Luo, Tingting Yang, Zhen Zhong, Shenlong Su, Xianli Yan, Yonggao Wu, Jinsong Poudeu, Pierre Ferdinand Poudeu Zhang, Qingjie Tang, Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States

Bi2Te3-based bulk materials are the best commercially available thermoelectric materials for near room temperature applications. However, the poor mechanical properties of zone melting material and inferior thermoelectric performance of powder metallurgical material restrict their large scale deployment. In this study, p-type Bi₂Te₃-based materials were prepared using the hot extrusion technique, and the underlying mechanisms for microstructure evolution were revealed. The hot extrusion speed significantly impacts the strain rate, an indicator to modulate the dynamic recrystallization (DRX) and grain growth, thereby effectively regulating the microstructures of samples. For the sample extruded at a speed of 1.0 mm min-1, the refined grain with an average grain size of 1.53 μm and an orientation factor F(110) of 0.28 is achieved. This highly textured structure and high-density low-angle boundaries (LAGBs) maintain the high carrier mobility of 264 cm2 V-1 s-1, comparable with the zone melting sample. In contrast, increasing grain boundaries, dislocations, and inherent point defects intensifies the phonon scattering and suppresses the lattice thermal conductivity to 0.73 W m-1 K-1. All these contribute to a practical high ZT value of 1.1 at room temperature. Moreover, the fine grains and high-density dislocations ensure robust mechanic properties with a compressive strength of 189 MPa and a bending strength of 139 MPa, which is a guarantee for the successful cutting of microparticles with dimensions of 100 × 100 × 200 μm3. The fabrication of high-quality materials with both high thermoelectric performance and strong mechanical properties paves the way for the miniaturization of thermoelectric modules. © 2024, The Authors. All rights reserved.

关键词： Textures

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Fabrication and Characterization of Pressure Sensors Based on Xanthan Gum and Pullulan

Fabrication and Characterization of Pressure Sensors Based o...

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作者： Ya-Qi Zhang Shi-Yao Liu Yong-Zhen Tao State Key Laboratory for Textile Materials and Advanced Processing Technology Wuhan Textile University College of Material Science and Engineering Wuhan Textile University

Conductive hydrogels based on biopolymers have potential applications in the field of wearable devices,implantable devices, and human-machine interfaces due to their biocompatibility as well as ***, hydrogels are prone to water loss under dry atmospheres. In this paper, a biopolymer-based pressure sensor with water retention was designed. Xanthan gum(XG) and pullulan(P) were cross-linked with sodium trimetaphosphate(STMP) to prepare XG5-P-STMP, and polyethylene glycol with a molecular weight of 200(PEG200) was added into hydrogels to improve moisture retention. The mechanical properties of the hydrogels were investigated by rheologic measurements such as time sweep, frequency sweep, and strain sweep. The results showed that the addition of PEG200 enhanced strength and moisture retention of the hydrogels, and high PEG200 content hindered the recovery property of the hydrogels. Furthermore, the XG5-P-PEG-STMP hydrogel with ionic conductivity and recoverability was explored as a pressure sensor, and the resistance change ratio exhibited repeatable profile. This work provides some valuable information for further applications of natural polysaccharides as intelligent flexible elections.

关键词：

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Flexible high-performance microcapacitors enabled by all-printed two-dimensional nanosheets

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Science Bulletin 2022年第24期67卷 2541-2549,M0004页

作者： Pengxiang Zhang Yushui Fu Xin Zhang Xihua Zhang Bao-Wen Li Ce-Wen Nan Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Chemically exfoliated nanosheets have exhibited great potential for applications in various electronic ***-based processing strategies such as inkjet printing provide a low-cost,environmentally friendly,and scalable route for the fabrication of flexible devices based on functional inks of twodimensional *** this study,chemically exfoliated high-k perovskite nanosheets(i.e.,Ca_(2)Nb_(3)O_(10)and Ca_(2)NaNb_(4)O_(13))are well dispersed in appropriate solvents to prepare printable inks,and then,a series of microcapacitors with Ag and graphene electrodes are *** resulting microcapacitors,Ag/Ca_(2)Nb_(3)O_(10)/Ag,graphene/Ca_(2)Nb_(3)O_(10)/graphene,and graphene/Ca_(2)NaNb_(4)O_(13)/graphene,demonstrate high capacitance densities of 20,80,and 150 nF/cm^(2) and high dielectric constants of 26,*** 200,*** dielectric enhancement in the microcapacitors with graphene electrodes is possibly attributed to the dielectric/graphene *** addition,these microcapacitors also exhibit good insulating performance with a moderate electrical breakdown strength of approximately 1 MV/cm,excellent flexibility,and thermal stability up to 200℃.This work demonstrates the potential of high-k perovskite nanosheets for additive manufacturing of flexible high-performance dielectric capacitors.

关键词： High-k perovskite nanosheets Inkjet printing Microcapacitors Dielectric enhancement Interface effect

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Phosphate-Based Ionic Liquids for advanced Interface Modification in Perovskite Photovoltaics: Novel Insights for Ionic Liquid Molecule Design

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SSRN 2024年

作者： Yang, Guo Wang, Fei Zhou, Chao Sun, Yonggui Wang, Taomiao Li, Qiannan Li, Yongjun Liang, Xiao Zhou, Xianfang Zhu, Quanyao Lin, Haoran Hu, Hanlin Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University 7098 Liuxian Boulevard Shenzhen518055 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan China

Interface modification stands out as a crucial method to enhance the performance of perovskite solar cells. This study explores the utilization of the ionic liquid 1-Methyl-3-propylimidazolium phosphate (MPIMPH), containing phosphate (PO43-) groups, as a modifier for SnO2/perovskite interfaces. Detailed investigations delve into the specific impact of IL MPIMPH on defects in tin dioxide, perovskite defects, perovskite crystallization, morphology, and overall device performance. Initially, Density Functional Theory (DFT) is employed to evaluate the defect passivation potential of different anions on tin vacancies within the SnO2 matrix, revealing the exceptional defect passivation ability of the PO43- group. Chemical interactions between ILs MPIMPH and SnO2, as well as perovskite, are confirmed, establishing a fundamental basis for interface defect passivation. ILs-based interface modification enhances interface contact, influencing the lead iodide conversion into perovskite and perovskite crystallization, ultimately leading to the formation of high-quality perovskite thin films. ILs also effectively suppress interfacial charge recombination and optimize the energy alignment of the SnO2/perovskite interface to enhance carrier extraction. Benefiting from the interface modification with ILs, the optimized device achieved an impressive device efficiency of 24.24% with remarkable durability. This work provides an novel aspect for designing ionic liquids to enhance interface modification, contributing to upscaling and application of perovskite photovoltaics. © 2024, The Authors. All rights reserved.

关键词： Perovskite

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