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Electrically variable interfaces in polymer nanocomposite dielectrics

Physical Review B 2024年第18期109卷 184205-184205页

作者： Wen-Zhi Luo Zhong-Hui Shen Yang Shen Long-Qing Chen Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan 430070 China School of Materials and Microelectronics Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802 United States

Polymer nanocomposites generally exhibit unexpected dielectric/electrical performance far beyond the sum of every component, which is mainly due to the interface effect induced by the differences in structures and properties between the nanofillers and the polymer matrix. However, understanding the capricious interface effect in different polymer nanocomposites remains a major challenge. Here, we perform density functional theory calculations to investigate the atomic/molecular configurations and local charge behaviors of heterogeneous interfaces between the fillers of perovskites, oxides, two-dimensional materials, and polar/nonpolar polymers. Our findings demonstrate that atomic reconfiguration takes place during the formation of the inorganic/organic interface in order to minimize the overall energy of the system. Significant charge accumulation occurs at heterogeneous interfaces due to electron redistribution, especially for the examples of HfO2 and negatively charged Ca2Nb3O10. When applying an electric field, local polarization, especially around the interface, will be distorted and enhanced as a result of interfacial interaction. Even for the nonpolar polymer with linear dielectric oxides such as TiO2, induced dipole moments also appear near the interface, leading to the improvement of overall polarizability. The outcomes of our study verify that the variable electrical behaviors at the interfaces are highly dependent on the feature of every component constituting the inorganic/organic interface, which offers valuable insights for optimizing the experimental design of heterogeneous interfaces in polymer nanocomposites.

关键词： Electric polarization Solid-solid interfaces Density functional calculations

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将硅纳米颗粒限域在多壳层空心球:一种提升循环稳定性的有效策略

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Science China materials 2023年第6期66卷 2199-2206页

作者：杜寰余若翰谭兴念吴劲松赵东元麦立强周亮 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Nanostructure Research Center(NRC) Wuhan University of TechnologyWuhan 430070China Hubei Longzhong Laboratory(LZL) Wuhan University of TechnoologyXiangyang 441106China

单质硅是一种有潜力的高容量锂离子电池负极材料.然而,受限于充放电过程中巨大的体积膨胀,其循环性能并不理想.在这个工作中,我们设计了一种独特的三组分复合负极材料(Si/Cr_(2)O_(3)/C),其中Si纳米颗粒被限域在碳包覆的氧化铬多层空心... 详细信息

单质硅是一种有潜力的高容量锂离子电池负极材料.然而,受限于充放电过程中巨大的体积膨胀,其循环性能并不理想.在这个工作中,我们设计了一种独特的三组分复合负极材料(Si/Cr_(2)O_(3)/C),其中Si纳米颗粒被限域在碳包覆的氧化铬多层空心球(MSHSs)中.得益于Cr_(2)O_(3)/C基体的体积变化缓冲能力与优异的结构稳定性,将Si纳米颗粒封装在MSHSs中可以有效地提高其电化学性能.合理的结构设计赋予了Si/Cr_(2)O_(3)/C三组分复合材料高的可逆容量(在100 mA g^(-1)的电流密度下,比容量为1351 mA h g^(-1))和稳定的循环性能(在500 mA g^(-1)的电流密度下,循环300次后比容量保持在716 mA h g^(-1)).这一工作提出了一种多壳层空心结构设计的新思路,以解决硅基负极材料循环性差的瓶颈.

关键词：硅基负极材料充放电过程硅纳米颗粒循环稳定性空心结构电化学性能有效策略空心球

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Laser stripping of Ag shell from Au@Ag nanoparticles

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Rare Metals 2021年第12期40卷 3454-3459页

作者： De-Zhi Zhu Jian-Feng Yan Zhen-Wei Liang Jia-Wang Xie Hai-Lin Bai Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaState Key Laboratory of TribologyDepartment of Mechanical EngineeringTsinghua UniversityBeijing 100084China

Metallic nanoparticles(NPs)are a class of important materials with widespread applications due to their chemical stability and high photothermal conversion *** is essential to post-control the morphology and structure of metallic NPs for practical *** processing of metallic NPs has been widely *** of previous studies on the reshaping process have been related to the single metallic NPs,and no attempt has been made to separate the components in bimetallic ***,the stripping of Ag shell from Au@Ag NPs based on ultrafast laser excitation was *** experimental work combined spectrum and microscopy analysis showed the structure transformation of Au@Ag *** the electric field simulation,the stripping of the Ag shell may arise from the electric field effect.

关键词： red image Laser stripping of Ag shell from Au@Ag nanoparticles

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Significant capacitance enhancement induced by cyclic voltammetry in pine needle-like Ni-Co-Cu multicomponent electrode

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Journal of materials Science & technology 2021年第19期78卷 100-109页

作者： Liqianyun Xu Liuyang Zhang Bei Cheng Jiaguo Yu Ahmed A.Al-Ghamdi S.Wageh State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou.450001China Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia

Poor conductivity and rate capability are the obstacles faced by nickel-cobalt composites as electrode materials for supercapacitor ***,simple electrochemical treatment conducted by cyclic voltammetry is applied and the overall performance of the active material is considerably *** discover that this treatment triggers the formation of Ni-Co-Cu ternary composite and optimizes the crystal structure of the untreated *** areal capacitance of the treated sample rockets up to 6.13 F cm^(-2)at 2 m A cm^(-2),almost 13 times higher than the untreated ***,the resistance is substantially reduced by cyclic voltammetry ***,the Coulombic efficiency and stability are concurrently *** reasons behind this treatment are mulled over and reasonable hypothesis is *** study provides a cheap and effortless way to reform the structures of as-obtained samples as well as vigorously raise the performance of current available materials.

关键词： Cyclic voltammetry Ni-Co-Cu ternary composite Ion exchange Supercapacitor

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Site-specific fabrication of gold nanocluster-based fluorescence photoswitch enabled by the dual roles of albumin proteins

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Aggregate 2023年第1期4卷 268-276页

作者： Wencheng Zhong Xiaojian Yan Shaohua Qu Li Shang State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’anChina Northwestern Polytechnical University Chongqing Technology Innovation Center ChongqingChina NPU-QMUL Joint Research Institute of Advanced Materials and Structures(JRI-AMAS) Northwestern Polytechnical UniversityXi’anChina

Fluorescence photoswitch is becoming increasingly desirable for many applications,but its controllable fabrication still remains challenging *** this paper,a new strategy is proposed to fabricate fluorescence photoswitch by harnessing dual roles of albumin proteins as both photochrome carriers and biotemplates of *** an example,we demonstrated the successful fabrication of a fluorescence photoswitch by incorporating both the photochromic diarylethene dye(CMTE)and red-emitting fluorescent gold nanoclusters(AuNCs)into the specific domains of bovine serum albumin(BSA)in a highly controllable *** spectral and photophysical characterisation showed that CMTE well-retains the photochromic properties within the CMTE–BSA–AuNC construct,although its photoconversion rate is slightly *** from previously reported photoswitches,the fluorescence of the present system is mainly modulated via the inner filter effect(IFE)mechanism,which exhibits high switching efficiency with an on-off ratio up to 90%,reversible fluorescence response and good antifatigue *** work provides a new,generable albumin protein-assisted strategy of fabricating advanced fluorescence photoswitch,which can find wide applications in biological,optical and information fields.

关键词： albumin protein fluorescence switch gold nanoclusters inner filter effect photochrome

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Locally Off-Centered Ge Atoms Contribute to High Thermoelectric Performance of Globally Averaged Cubic MnGeTe2 Alloys

SSRN

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SSRN 2024年

作者： Mei, Qicai Xie, Chenghao Cui, Jingjing Liao, Chengyun Li, Songlin Tang, Xinfeng Tan, Gangjian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science & Engineering Wuhan University of Technology Wuhan430070 China

Exploring high-performance and environment-benign thermoelectric materials free of phase change during their service is a long-standing challenge. Herein a maximum ZT of 1.4 at 878 K is reported for non-toxic Sb-doped MnGeTe2 alloys with a consistent cubic rock salt structure above room temperature. Pristine MnGeTe2 is a heavily self-doped p-type semiconductor with its hole density (pH) exceeding 1021 cm-3. Due to the strong contribution of localized 3d orbitals from Mn to the valence band maxima lying along the Γ–K direction with a high valley degeneracy of 4 , MnGeTe2 features a superb density of states (DOS) effective mass (m* ~ 10 me), endowing it a large Seebeck coefficient of ~105 μV K-1 at 300 K despite its over high pH. Moreover, Ge atoms are locally discordant in MnGeTe2 and displaced ∼0.33 Å off the octahedron center, inducing soft polar phonons that effectively scatter the heat carrying acoustic phonons and enable a low lattice thermal conductivity (κlat ~0.57 W m-1 K-1 at 871 K). Sb doping not only efficiently neutralizes the excess pH of MnGeTe2 leading to high Seebeck coefficient (> 250 μV K-1), but further drops κlat to ~0.49 W m-1 K-1 by reinforced point defect scattering. Our work highlights the significance of local off-centering atoms in developing high-performance bulk thermoelectric materials. © 2024, The Authors. All rights reserved.

关键词： Germanium alloys

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Corrosion resistance and antimicrobial properties of ZnO-Ce2O3 coatings by magnetron sputtering

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Journal of Vacuum Science and technology A: Vacuum, Surfaces and Films 2025年第4期43卷

作者： Tu, Rong Qin, Zixiong Wu, Wei Zheng, Long Xu, Qingfang Gao, Tenghua Zhang, Song Dai, Honglian Goto, Takashi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Wuhan430070 China

The ZnO-Ce2O3 composite coating developed in this study significantly enhances the medical applicability of 316L stainless steel by synergistically improving corrosion resistance and antibacterial performance. Through magnetron sputtering, the ZnO-Ce2O3 composite coating reduces the corrosion current density of 316L stainless steel by an order of magnitude (from 2.935 × 10−7 to 1.278 × 10−8 A/cm2), outperforming individual ZnO or CeO2 coatings. Biological experiments demonstrated that the composite coating achieved over 98% antibacterial efficiency against Staphylococcus aureus while exhibiting low cytotoxicity toward mesenchymal stem cells, thereby addressing critical limitations of traditional stainless steel in medical devices. Additionally, the increased water contact angle (from 80° to 114°) correlated with inhibited bacterial adhesion, suggesting a dual antibacterial mechanism. This multifunctional coating strategy offers a promising solution for improving implant safety and patient outcomes. © 2025 Author(s).

关键词： Corrosion resistant coatings

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Achieving enhanced thermoelectric and mechanical performance in p-type bismuth telluride through constrained hot deformation

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Ceramics International 2025年第18期51卷 26475-26482页

作者： Chen, Quansheng Ji, Chen Yu, Jian Hua, Lin Zhao, Wenyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Automotive Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Jiujiang University Jiujiang332005 China Hubei Key Laboratory of Advanced Technology for Automobile Components Wuhan University of Technology Wuhan430070 China

Bi2Te3-based alloys remain the only commercially available thermoelectric (TE) materials. However, their practical applications are severely constrained by the inferior mechanical performance of the zone melting (ZM) ingot. Herein, a simple constrained hot deformation (CHD) technology was developed to prepare the p-type Bi0.5Sb1.5Te3 polycrystalline materials derived from ZM ingots. It was discovered that the deformation process has negligible impact on the phase composition, but can efficiently refine the grains to approximately 5 μm through the dynamic recrystallization and simultaneously introduce high-density dislocations. Although the donor-like effect induced by deformation would obviously deteriorate the electrical conductivity, the recovery effect triggered by high deformation temperature can effectively optimize the carrier concentration and thus alleviate the degradation of power factor. The material deformed at 773 K maintains a relatively high power factor ∼3.33 mW K−2 m−1 at 300 K, together with a significantly decreased lattice thermal conductivity ∼0.59 W m−1 K−1, and an improved zT ∼1.1 was obtained ultimately. More importantly, the deformed materials show a significant improvement in mechanical performance due to the grain refinement. A maximum average Vickers hardness of 0.67 GPa was achieved for the material deformed at 723 K, which is ∼40 % higher than that of the ZM ingot. Our work indicates the simple CHD is an efficient technology to synergistically enhance both TE and mechanical properties of Bi2Te3-based ZM ingot. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Polycrystalline materials

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A facile approach to fabricating graphene/waterborne epoxy coatings with dual functionalities of barrier and corrosion inhibitor

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Journal of materials Science & technology 2022年第17期112卷 263-276页

作者： Suyun Liu Xuewan Wang Qi Yin Xiongzhi Xiang Xian-Zhu Fu Xian-Zong Wang Jing-Li Luo Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China

A facile and environmentally-friendly method is developed to prepare graphene/waterborne epoxy(WEP)composite *** graphene nanosheets are produced with electrochemical-exfoliation in the solution containing surfactants,cetyl trimethyl ammonium bromide(CTAB)and sodium dodecyl sulfate(SDS).The nanosheets containing solution thus formed are subjected to a quick dialysis and then directly used as a diluent for WEP without any further *** preparation method overcomes the commonly identified problems of aggregations and‘corrosion promotion’effect associated with graphene,and increases the impedance of the composite coatings by more than two orders of *** analysis of anticorrosion performance suggested that the presence of surfactants not only improves the dispersibility of graphene nanosheets but also endows the composite coatings with both barrier and corrosion inhibition *** strategy reported herein may pave the path to the large-scale production of graphene anticorrosion coatings.

关键词： Electrochemical-exfoliation graphene Waterborne epoxy coatings Anticorrosion Inhibition

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Effects of TMAH dispersant on rheological behavior of Nd: YAG slurries and optical properties of transparent ceramics 17

Effects of TMAH dispersant on rheological behavior of Nd: YA...

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17th National Conference on Laser technology and Optoelectronics

作者： Luo, Peng Guo, Ruisong Xin, Yu Wang, Yaozhi Zhao, Wenhai Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering Tianjin University Tianjin300350 China The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430079 China School of Material Science and Engineering Shanghai University Shanghai200444 China

ISBN: (纸本)9781510661097

In this study, transparent Nd: YAG ceramic was fabricated by gel casting of iso bam system using a dispersant composed of tetramethylammonium hydroxide (TMAH) to modify the rheological properties of slurry. The effects of dispersant content on the dispersibility and viscosity of slurry were studied, as well as the microstructure and light transmittance of the obtained transparent ceramics were also analyzed through the introduction of 0 − 1.5 wt.% TMAH. The results showed that the dispersion mechanism of TMAH is mainly to control the electrostatic property and the alkaline Zeta potential value of the slurry. The electrostatic repulsion of ceramic particles in the slurry could be effectively increased through the dispersing action of the additive, thereby reducing the viscosity of the slurry and improving the fluidity of the slurries. Under the TMAH content of 1 wt.%, a high-fluidity and good dispersion of Nd: YAG slurry with a solid load of 78.8 wt.% was obtained. A low viscosity of 72.89 mPa·s was achieved under shearing of 100 s-1, and a dense uniform body was obtained by self-gelling reaction. Highly transparent Nd: YAG ceramics were obtained after vacuum reaction sintering at 1780°C for 10 h, with a transmittance of 75.12% at 1064 nm. In all, the TMAH dispersant could effectively improve the molding properties of PIBM single system gel injection molding transparent ceramics. © 2022 SPIE.

关键词： Optical properties

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