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Reactions between graphene oxide sheets cause irreversible agglomeration

科学通报（英文版） 2022年第19期67卷 1943-1945页

作者： Ying Dong Jing Li Xiao-Yu Yang Department of Forensic Medicine Huazhong University of Science and TechnologyWuhan 430030China Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials School of Chemistry and Chemical EngineeringWuhan University of Science and TechnologyWuhan 430081China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Joint Laboratory for Marine Advanced Materials in National Laboratory for Marine Science and Technology(Qingdao) Wuhan University of TechnologyWuhan 430070China School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA

Graphene has received increased attention recently owing to its wide range of significant *** is comprised of planar sheets of carbon atoms arranged in six-membered ring net-works(Fig.1a).An atomically thin sheet of this substance can be regarded as molecular entity,in which nanometer-scale corruga-tions and defects create different physical and chemical *** about how these sheets interact with solvent molecules and how the defects govern these interactions is a crit-ical component of understanding and predicting the liquid-phase chemistry of *** angle measurements have been typically utilized to gain macroscopic information about interfacial interactions occurring between water and *** to its one carbon atom thickness,the top single-layer of graphene is wet-ting transparent to the underlying substrates[1,2].The surface hydrophobicity of graphene can be induced by adsorption of air-borne pollutants(e.g.,hydrocarbons)[3].In addition,graphene-based interfacial materials having either superhydrophobicity or superhydrophilicity have been developed.

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Understanding the effect of rare-earth doping in ABO3 ferroelectrics on capacitive energy storage

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Journal of the European Ceramic Society 2025年第14期45卷

作者： Duan, Yu-Lin Wang, Jian Shen, Zhong-Hui Zhou, Meng-Jun Jiang, Jian-Yong Liu, Han-Xing Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan430070 China School of Materials and Microelectronics Wuhan University of Technology Wuhan430070 China Wuzhen Laboratory Tongxiang314500 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing100084 China

Rare-earth doping, even in trace amounts, can significantly regulate the energy storage performance of ferroelectric materials by synergistically adjusting microscopic behaviors such as crystal structure and energy bands. However, understanding the mechanisms by which different rare-earth elements influence the energy storage performance such as polarization and breakdown remains a major challenge. To address this, we use density functional theory to systematically investigate the effect of rare-earth doping on the microscopic ferroelectric behavior in three ABO3 perovskite ferroelectrics by substituting A-site or B-site ions with 15 types of rare-earth ions. The results show that when introducing rare-earth ions, lattice structure and electronic state distribution can be rebuilt due to strong volume effect and hybridization, thereby altering the ion displacement polarization, reversal energy barrier, and energy gap. Notably, their effects highly depend on the occupancy of rare-earth ions on the A-site or B-site. For A-site doping, a decrease in the ionic radius of rare-earth ions generally leads to increases in the c/a ratio, polarization strength, reversal energy barrier, and energy gap, whereas B-site doping shows the opposite trends. This work reveals the underlying mechanisms of rare-earth doping on affecting the energy storage performance and provides important theoretical guidance for engineering rare-earth doping in perovskite ferroelectrics. © 2025 Elsevier Ltd

关键词： Crystal lattices

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The influence of cooling rates on strain phase diagrams and domain structures of ferroelectric thin films: A case study of PbTiO 3

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Acta Materialia 2025年 296卷

作者： Meng-Jun Zhou Peng Zhang Bo Wang Di Yi Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Materials Science Division Lawrence Livermore National Laboratory Livermore CA 94550 USA School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Strain engineering has been established as an effective approach to control phase equilibria, domain configurations, and functional properties of ferroelectric thin films. Temperature-strain phase diagrams have been used as powerful tools for providing insights into strain engineering. However, almost all existing phase diagrams established using the phase-field approach assume quenching conditions without considering actual cooling rates during the post-deposition annealing process of ferroelectric thin films. Within this work, we systematically investigate the influence of cooling rates on domain structures and the strain-phase diagram of ferroelectric thin films using phase-field simulations, taking PbTiO 3 thin films as a model system. We found that both the position of phase boundaries in the strain phase diagrams and the domain morphology are significantly influenced by the cooling rates. It is revealed that while the paraelectric-ferroelectric phase boundary remains invariant, the phase boundaries between single-phase and multi-phase regions tend to shift toward the corresponding multi-phase region as the cool rate reduces. Slow cooling generally leads to more ordered domain structures with increased domain size. Using the obtained equilibrium domain structures, we calculated effective thermal conductivities and found significant variations that can be tuned by the cooling rates. This work reveals an underexplored yet critical impact of cooling rates on phase equilibria and domain structures in ferroelectric thin films, which may inspire further fine-tuning of domains and domain walls in low-dimensional ferroelectrics for multifunctional applications.

关键词： Domain structures Ferroelectric thin films Phase diagrams Phase-field simulation Thermal conductivity

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Highly sensitive strain sensor from topological-structure modulated dielectric elastic nanocomposites

arXiv

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arXiv 2021年

作者： Fan, Youjun Shen, Zhonghui Zhou, Xinchen Dan, Zhenkang Zhou, Le Ren, Weibin Tang, Tongxiang Bao, Shanyong Nan, Cewen Shen, Yang State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Center for Flexible Electronics Technology Tsinghua University Beijing100084 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan430070 China

Flexible strain sensors are critical to several potential intelligent applications, such as human-machine interfaces, soft robotics, human motion detection, and safety monitoring of components. Stretchable functional materials are important components of strain sensors, and they are still major challenges for high performance strain sensors. Herein, we demonstrate a novel strategy of designing and optimizing flexible strain sensor by developing topological structure modulated high permittivity elastic nanocomposite. The topological structure with three-phase percolative nano-nanonetworks produces synergistic effects of space charge enhancement and local electric field modulation, and it gives rise to an ultrahigh dielectric permittivity (113.4, at 1 kHz, over 1500% enhancement than that of commercial elastic polyurethane matrix) and excellent comprehensive electromechanical performance, and the optimal comprehensive electromechanical performance reaches to 542.91 MPa-1, which is over 9-fold than that of commercial polyurethane elastic film. An interdigital capacitive strain sensor is designed using the topological structured elastic dielectric nanocomposite. It possesses high initial capacitance density and positive capacitance response with stain, achieving high signal-to-noise ratio, high capacitance response sensitivity, and wide linear range, and it breaks through disadvantages of negative sensitivity and narrow linear range for conventional interdigital strain sensors. The prepared integrated strain sensor arrays are able to measure local strain of convoluted surfaces and monitor the motion of soft actuators in real time, and they would make conditions for intelligent control systems and the study of morphological intelligence. Copyright © 2021, The Authors. All rights reserved.

关键词： Nanocomposites

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Engineering Fe‑N_(4)Electronic Structure with Adjacent Co‑N_(2)C_(2)and Co Nanoclusters on Carbon Nanotubes for Efficient Oxygen Electrocatalysis

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Nano-Micro Letters 2023年第12期15卷 283-297页

作者： Mingjie Wu Xiaohua Yang Xun Cui Ning Chen Lei Du Mohamed Cherif Fu‑Kuo Chiang Yuren Wen Amir Hassanpour Francois Vidal Sasha Omanovic Yingkui Yang Shuhui Sun Gaixia Zhang State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200People’s Republic of China Institut National de la Recherche Scientifique(INRS) Center Energie Materiaux TelecommunicationsVarennesQC J3X 1P7Canada Department of Chemical Engineering McGill University3610 University StreetMontrealQC H3A 0C5Canada Department of Electrical Engineering Ecole de Technologie Superieure(ETS)MontrealQC H3C 1K3Canada Canadian Light Source(CLS) 44 Innovation BoulevardSaskatoonSK S7N 2V3Canada National Institute of Low-Carbon-and-Clean-Energy Beijing 102211People’s Republic of China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083People’s Republic of China

Regulating the local configuration of atomically dispersed transition-metal atom catalysts is the key to oxygen electrocatalysis performance *** the previously reported singleatom or dual-atom configurations,we designed a new type of binary-atom catalyst,through engineering Fe-N_(4)electronic structure with adjacent Co-N_(2)C_(2)and nitrogen-coordinated Co nanoclusters,as oxygen *** resultant optimized electronic structure of the Fe-N_(4)active center favors the binding capability of intermediates and enhances oxygen reduction reaction(ORR)activity in both alkaline and acid *** addition,anchoring M-N-C atomic sites on highly graphitized carbon supports guarantees of efficient charge-and mass-transports,and escorts the high bifunctional catalytic activity of the entire ***,through the combination of electrochemical studies and in-situ X-ray absorption spectroscopy analyses,the ORR degradation mechanisms under highly oxidative conditions during oxygen evolution reaction processes were *** work developed a new binary-atom catalyst and systematically investigates the effect of highly oxidative environments on ORR electrochemical *** demonstrates the strategy for facilitating oxygen electrocatalytic activity and stability of the atomically dispersed M-N-C catalysts.

关键词： Atomically dispersed Fe-N-C catalysts ORR/OER Rechargeable zinc-air battery Fuel cells

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Transient surface microdissolution properties of meta-aramid fiber

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Surfaces and Interfaces 2025年 70卷

作者： Jing Chai Yuhe Liu Dan Sheng Jianquan Li Weilin Xu State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 PR China Winner Medical Co. Ltd. Shenzhen 518109 PR China Jiangsu New Horizon Advanced Functional Fiber Innovation Center Co. Ltd. Suzhou 215000 PR China

Meta-aramid possesses good stability and excellent mechanical properties. However, their lack of reactive chemical groups results in low surface activity, limiting the ability to construct structural composites. The method provided in this paper utilizes the rapid volatilization of DMAc under high-temperature conditions to microsolvate the surface of meta-aramid fibers, efficiently achieving surface modification of meta-aramid. The effects of various processing conditions on the molecular aggregate structure, surface microstructure, and fabric mechanical properties of the modified meta-aramid were systematically studied to determine the optimal process for surface microdissolution via the transient high-temperature method and to construct a relevant mechanistic model. The results indicate that the DMAc/LiCl system can achieve superior microdissolution on the surface of meta-aramid in only 4 s at 175 °C, with a minimal effect on its mechanical properties. Transient modulation of the meta-aramid surface structure using the DMAc/LiCl system provides a new approach for the efficient preparation of meta-aramid structural composites.

关键词： DMAc/LiCl System Meta-aramid Microdissolution Structural regulation

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Mechanically reprogrammable Pancharatnam-Berry metasurface for microwaves

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advanced Photonics 2022年第1期4卷 69-79页

作者： Quan Xu Xiaoqiang Su Xueqian Zhang Lijuan Dong Lifeng Liu Yunlong Shi Qiu Wang Ming Kang Andrea Alù Shuang Zhang Jiaguang Han Weili Zhang Tianjin University Center for Terahertz Waves and College of Precision Instrument and Optoelectronics EngineeringKey Laboratory of Optoelectronic Information Technology(Ministry of Education of China)TianjinChina Shanxi Datong University Institute of Solid State Physics and College of Physics and Electronic ScienceShanxi Province Key Laboratory of Microstructure Electromagnetic Functional MaterialsDatongChina Wuhan University of Technology School of Information EngineeringWuhanChina Tianjin Normal University College of Physics and Materials ScienceTianjinChina City University of New York Advanced Science Research CenterPhotonics InitiativeNew YorkUnited States City University of New York Graduate CenterPhysics ProgramNew YorkUnited States University of Hong Kong Faculty of ScienceDepartment of PhysicsHong KongChina University of Hong Kong Department of Electrical and Electronic EngineeringHong KongChina Guilin University of Electronic Technology Guangxi Key Laboratory of Optoelectronic Information ProcessingSchool of Optoelectronic EngineeringGuilinChina Oklahoma State University School of Electrical and Computer EngineeringStillwaterOklahomaUnited States

Metasurfaces have enabled the realization of several optical functionalities over an ultrathin platform,fostering the exciting field of flat *** metasurfaces are achieved by arranging a layout of static meta-atoms to imprint a desired operation on the impinging wavefront,but their functionality cannot be *** and programmability of metasurfaces are the next important step to broaden their impact,adding customized on-demand functionality in which each meta-atom can be individually *** demonstrate a mechanical metasurface platform with controllable rotation at the meta-atom level,which can implement continuous Pancharatnam–Berry phase control of circularly polarized *** the proof-of-concept experiments,we demonstrate metalensing,focused vortex beam generation,and holographic imaging in the same metasurface template,exhibiting versatility and superior *** dynamic control of electromagnetic waves using a single,low-cost metasurface paves an avenue towards practical applications,driving the field of reprogrammable intelligent metasurfaces for a variety of applications.

关键词： reprogrammable metasurfaces Pancharatnam-Berry phase mechanical metasurfaces microwaves

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Cr2O3/RuO2Heterojunction Catalysts for Enhanced Oxygen Evolution Reaction in Acidic media

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ChemistrySelect 2025年第21期10卷

作者： Jiayi Zhao Na Yao Wei Luo College of Chemistry and Molecular Sciences Wuhan University Wuhan Hubei 430072 P. R. China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan Hubei 430200 P. R. China

Ruthenium-based catalysts are currently considered as the promising alternatives to high-cost iridium-based catalysts employed for acidic oxygen evolution reaction (OER) but they still faces the bottlenecks of limited durability and slow kinetics. In this study, we synthesized Cr 2 O 3 /RuO 2 heterojunction catalysts via hydrothermal and annealing techniques to address this issue. The synthesized Cr 2 O 3 /RuO 2 catalysts demonstrated a low overpotential of 220 mV in an acidic environment to reach a current density of 10 mA cm −2 as well as stable operation for 100 h. Experimental results show that the introduction of Cr 2 O 3 into the RuO 2 can modulate the electronic structure of RuO 2 , thereby optimizing the adsorption behavior of key intermediates on the Cr 2 O 3 /RuO 2 heterojunction and enhancing its acidic OER performance. These findings provide valuable insights for future efficient acidic OER electrocatalyst design.

关键词： Acidic OER Cr2O3/RuO2 heterojunction Electronic structure Intermediates

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Heteroepitaxy of large-area, monocrystalline lead halide perovskite films on gallium arsenide

arXiv

引用

arXiv 2022年

作者： Kong, Deying Zhang, Yu Cheng, Dali Wang, Enze Zhang, Kaiyuan Wang, Huachun Liu, Kai Yin, Lan Sheng, Xing School Of Materials Science And Engineering The Key Laboratory Of Advanced Materials Of Ministry Of Education State Key Laboratory Of New Ceramics And Fine Processing Center For Flexible Electronics Technology Tsinghua University Beijing China Department Of Physics Tsinghua University Beijing China Department Of Electronic Engineering Beijing National Research Center For Information Science And Technology Center For Flexible Electronics Technology IDG/McGovern Institute For Brain Research Tsinghua University Beijing China

Lead halide perovskite materials have been emerging as promising candidates for highperformance optoelectronic devices. Significant efforts have sought to realize monocrystalline perovskite films at a large scale. Here, we epitaxially grow monocrystalline methylammonium lead tribromide (MAPbBr3) films on lattice-matched gallium arsenide (GaAs) substrates at a centimeter scale. In particular, a solutionprocessed lead(II) sulfide (PbS) layer provides a lattice-matched and chemical protective interface for the solid-gas reaction to form MAPbBr3films on GaAs. Structure characterizations identify the crystal orientations in the trilayer MAPbBr3/PbS/GaAs epi-structure and confirm the monocrystalline nature of MAPbBr3on PbS/GaAs. The dynamic evolution of surface morphologies during the growth indicates a two-step epitaxial process. These fundamental understandings and practical growth techniques offer a viable guideline to approach high-quality perovskite films for previously inaccessible applications. © 2022, CC BY-NC-ND.

关键词： Lead compounds

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Relationship of Electrical Properties and Partical Size of Piezoelectric Ceramics Fabricated by Digital Light processing 3D Printing

Research Square

引用

Research Square 2021年

作者： Liu, Kai Hu, Jiaming Shi, Yusheng Zhou, Chenyang Sun, Yunfei Zhang, Song Tu, Rong Zhang, Qingqing Zhang, Yuzhen Yin, Changxia Huang, Shangyu Sun, Huajun State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Hubei Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Hubei Wuhan430074 China Advanced Ceramics Institute of Zibo New & High-Tech Industrial Development Zone Shandong Zibo255000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

To improve electrical properties of BaTiO3 piezoelectric ceramics fabricated by 3D printing, effects of particle sizes was investigated on rheological and curing properties of ceramic slurries, electrical properties of BaTiO3 fabricated by Digital Light processing 3D printing method. It was found that the curing ability of ceramic slurries decreased first and then increased with the increase of particle size from 136 nm to 1486 nm, while the viscosity of the slurries kept decreasing. When the particle size in a range of submicron, the grain size of sintered ceramics decreased from 13.27 μm to 6.84 μm as particle size increasing. Immediately, the relative density, piezoelectric constant, relative permittivity and remanent polarization of sintered ceramics were measured and it turns out to reach 95.32%, 161.4 pC/N, 1512 and 7.59 uC/cm2 respectively while using the BaTiO3 powder with particle sizes of 993 nm. Finally, a cellular structural BaTiO3 ceramics was fabricated by using optimized powder and process parameters and packaged as a piezoelectric sensor, showing a good function of force-electricity conversion. These results demonstrated the feasibility of fabricating high-quality functional ceramics with designed geometry by Digital Light processing. © 2021, CC BY.

关键词： Particle size

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