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SSRN 2023年

作者： Xu, Jiahui Kang, Shujie Wang, Jian Xu, Feng Shi, Chao Zhang, Kewei Wang, Jiafu Chen, Zhengxiang He, Jun Sun, Zhigang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China China Shipbuilding Industry Corporation 710th Research Institute Yichang443003 China Division of Functional Material Research Central Iron and Steel Research Institute Beijing100081 China

As a key part of fluxgate, the properties of magnetic core determine the performance of fluxgate sensor. We studied the effects of zero magnetic field annealing (ZFA) and longitudinal magnetic field annealing (LFA) on soft magnetic properties, magnetic anisotropy and magnetic domain structure of the Co70Fe5Si15B10 amorphous ribbon and its fluxgate sensor performance. It is found that LFA can effectively modulate the magnetic domain from irregular shape and size to wide regular strip domains. As a result, pinning effect, magnetic anisotropy and coercivity decrease, while the initial permeability increases. And finally, the sensitivity of the fluxgate become higher, and noise become less. The results show that the optimal soft magnetic properties of the ribbons are obtained after LFA at 440 ℃, with the initial permeability of 21020 and the coercivity of 0.2 A/m. We applied a square wave excitation signal of size 30 mA and frequency 2.4 kHz to test the performance of the fluxgates. It is found that the flux gate sensitivity increases from the original 36.54 to 41.82 mV/μT after magnetic field annealing treatment, and the peak-to-peak noise (Noisep-p) value at 10Hz bandwidth in 250 s decreases from the original 5.22 to 2.14 nT. The results show that the LFA treatment of the core has a significant effect on its magnetic properties and fluxgate performance enhancement, and these results have good implications for the construction of high-performance fluxgate. © 2023, The Authors. All rights reserved.

关键词： Magnetic anisotropy

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Preparation and dielectric properties of high reliability Nano-BaTiO3 Co-doped with Tm2O3 and MgO for BME-MLCC application

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Ceramics International 2025年

作者： Liu, Haizhou Wang, Zhen Wu, Jianjian Guo, Qinghu Yao, Zhonghua Liu, Hanxing Hao, Hua State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan 528200 China

BaTiO3 has become the most widely used material in MLCC due to its excellent electrical properties. In this work, BaTiO3-x %Tm2O3 (x = 1, 3, 5, 7) and BaTiO3-5 %Tm2O3-y %MgO (y = 0.2, 0.4, 0.6, 0.8) ceramics were prepared by solid-state method in reducing atmosphere and reduction resistance mechanism and dielectric properties of them were investigated. It is confirmed that the Tm³⁺ ion substitutes the Ti⁴⁺ site and significantly improves the reduction resistance of BaTiO3 ceramics when x ≥ 3 with resistivity up to 10¹⁰ Ω•cm. The grain size of BaTiO3-5 %Tm2O3-y %MgO ceramics is reduced to 176 nm, which is beneficial to increase bias stability. The formation of the “core-shell” structure improves the dielectric temperature stability of BaTiO3-based ceramics and a series of X7R (−55 °C–125 °C, temperature coefficient of capacitance (TCC) ≤ ±15 %) ceramics were obtained when x = 5 and y = 0.2–0.6. When x = 5, y = 0.4, the dielectric constant at room temperature is 1610 with a low dielectric loss of 0.009. Combining XPS and TSDC analyses, the reduction resistance mechanism of BaTiO3-5 %Tm2O3-y%MgO ceramics is attributed to the formation of defect dipoles, [2TmTi^′−VO^··] and [MgTi^″−VO^··], due to the cooperation of acceptor ions.

关键词： Anti-reduction BaTiO3 Dielectric temperature stability Resistivity

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Improved dielectric properties and anti-reducing mechanism of Er/Mg Co-doped BaTiO3-based ceramics produced in reducing atmosphere

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Ceramics International 2025年

作者： Zeng, Manting Liu, Xingzhong Hao, Hua Yao, Zhonghua Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

BaTiO3-1.6MnO2-xEr2O3 ceramics (abbreviated as BMT-xEr) and BaTiO3-1.6MnO2-3Er2O3-xMgO ceramics (abbreviated as BEMT-xMg) were prepared under a reducing atmosphere by solid-state synthesis method in this work. The effects of Er/Mg co-doping on phase transformation, microstructure, dielectric properties, and defect were systematically investigated. Research shows that Er-doping reduces the Curie temperature and increases the dielectric constant of BaTiO3 ceramics at low temperatures. Mg-doping refines the grain size and makes the grain size distribution more uniform, which is an important reason for the enhanced bias stability. The substitution of Mg at the B-site generates additional oxygen vacancies which capture free electrons and simultaneously forms defect dipoles. The anti-reducing properties are improved by reducing the carrier concentration. The synergistic effect of co-doping forms defect dipoles such as [MgTi″‐2ErBa∙], [MgTi″‐VO∙∙] and [2ErTi′‐VO∙∙] to enhance dielectric relaxation behavior which is considered to be the reason for the improved dielectric temperature stability. When x = 0.4, optimized dielectric ceramics are obtained with Ε25°C = 1820, tanδ = 0.009, resistivity of 1.0 × 1011 Ω·cm, which meets the EIA X7R standard (−55 °C - 125 °C, TCC ≤ ± 15 %). © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Dielectric properties of solids

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Improved ammonia sensing performance of Nd-modified nano-BaTiO3 at room temperature

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Journal of Alloys and Compounds 2025年 1033卷

作者： Hu, Ruize Hao, Hua Cheng, Jingsai Feng, Feiyang Guo, Qinghu Yao, Zhonghua Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

In this study, BaTiO3 doped with Nd ions (Ba1-xNdxTiO3, x = 0 ∼ 0.02) nanoparticles were prepared by hydrothermal method, and their gas sensitivity to NH3 at room temperature was investigated. Compared with BaTiO3, the particle size of Nd doped BaTiO3 powder decreases and the specific surface area increases. At the same time, the gas-sensitive performance on NH3 is enhanced, which is mostly due to that the increased concentration of oxygen vacancy and adsorbed oxygen promote the reaction between adsorbed oxygen and NH3. At room temperature, the response value of Ba0.996Nd0.004TiO3 to NH3 gas at 50 ppm is about 54 %, and the response time and recovery time are 11 s and 14 s, respectively. The results show that the excellent NH3 gas sensitive property is obtained for Ba1-xNdxTiO3 nanopowder. The adsorption energy, work function and charge density of Ba1-xNdxTiO3 toward NH3 is studied via density functional theory (DFT) based on first-principle. When doped with Nd ion at low concentration, BaTiO3 will be transformed into n-type semiconductor with the decreasing adsorption energy and increasing the electron transfer between NH3 and its surface, which result in the improved gas sensitivity to NH3 at room temperature. This study provides a new method for the preparation and the design of BaTiO3-based NH3 gas sensor. © 2025 Elsevier B.V.

关键词： Nanoparticles

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Sprayed and Mechanical-Modified Graphite Layer as Transferred Electrode for High-Efficiency Perovskite Solar Cells

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SSRN 2022年

作者： Chen, Lin Duan, Qiuyue Dong, Wei Zhu, Aodong Zhang, Ao Zhang, Xinxin Zhong, Jie Huang, Fuzhi Cheng, Yi-Bing Xiao, Junyan School of Materials Science and Engineering Wuhan University of Technology 122 Luoshi Road Hubei Wuhan China State Key Laboratory of Advanced Technologies for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Hubei Wuhan China Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology 1037 Luoyu Road Hubei Wuhan China Research Centre for Advanced Thin Film Photovoltaics Wuhan University of Technology 122 Luoshi Road Hubei Wuhan China

As an alternative of evaporated metal top electrode in perovskite solar cells, the transferred top electrode technique has the outstanding advantage of simple process. And in the case of carbon based transferred top electrode, the efficiency of corresponding perovskite devices can be higher than 20%. During the solid-to-solid electrode transferring process, it is essential to achieve effective contact and to avoid damage of bottom functional layers for an improved device performance. In this work, a sprayed graphite layer on conductive substrate is employed as transferred top electrode for perovskite solar cells. A simple mechanical polishing treatment is further adopted to modify the surface status of graphite layer. Compared with as sprayed graphite electrode, polished electrode shows better electrical property and optimized interface contact with hole-transporting layer. Thus, the average efficiency of perovskite device with mechanical modified electrode can significantly increase from 16.3% to 19.2%. © 2022, The Authors. All rights reserved.

关键词： Perovskite

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One-Step Anti-Solvent Associated Method for High Performance Two-Dimensional Perovskite Photodetectors Fabrication at Low Temperature

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SSRN 2022年

作者： Yue, Yunfan Li, Ming-Yu Li, Hao Chai, Nianyao Dong, Yifan Li, Zeping Chen, Xiangyu Wang, Xuewen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory The Advanced Energy Science and Technology Guangdong Laboratory Foshan528216 China School of Science Wuhan University of Technology Hubei Wuhan430070 China Engineering Research Center of Nano-Geomaterials Ministry of Education Faculty of Material Science and Chemistry China University of Geosciences Wuhan430074 China

The two-dimensional (2D) organic-inorganic perovskite of unique optical properties and improved stability holds great potential in high-performance perovskite optoelectronic applications. However, a huge challenge to manufacture continuous thin films at large scale and low cost is still unresolved. Here, a facile method to fabricate high quality (PEA) 2 PbI 4 thin films at low temperature in the air condition by one-step anti-solvent associated method was firstly proposed. The mechanism of nucleation sites formation and grain growth rates governed by the polarity and saturated vapor pressure of anti-solvents and annealing temperature was disclosed. By comparing different anti-solvents at various annealing temperatures, high quality thin films with the lowest annealing temperature of 80 °C were achieved by using toluene. A simple planar photodetector was configured, with the Responsivity (R s ) and Detectivity (D*) of 752 μA/W and 2.76×10 8 Jones with active area of 150 μm × 8000 μm, respectively, and the stability keeping 92% after 90 cycles under continuous light illumination in the air. This method offers a simple and low cost approach for manufacturing high quality 2D perovskite films and high-performance photodetectors at low temperature for industrial applications. © 2022, The Authors. All rights reserved.

关键词： Perovskite

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Scalable polydopamine@ZrO2/PVDF composite ink for corrosion protection of magnesium alloy

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 721卷

作者： Li, Zhenyang Yang, Kai Zhang, Pengxiang Wang, Yunfan Peng, Jian Li, Bao-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices and Center of Biomedical Material and Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China

Two-dimensional (2D) materials have exhibited significant potential in the field of metal anticorrosion coatings. However, nanosheets with high electrical conductivity may promote "corrosion-enhancing activity," thereby compromising the protective efficacy of the coating. In contrast, metal oxide nanosheets derived from layered compounds present a promising alternative due to their favorable properties. In this study, a composite ink for AZ31 magnesium alloy anticorrosion with blade coating method is fabricated by polydopamine (PDA)-coated ZrO2 nanosheets/polyvinylidene fluoride (PVDF). The surface composition and microstructure of the resulting coating are systematically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). The anticorrosion properties of the composite coating are evaluated through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The electrochemical results demonstrate that the ZrO2@PDA/PVDF coating achieves a corrosion protection efficiency of 99.93 %, with a corrosion current density of 9.48 × 10−8 A·cm−2, which is three orders of magnitude lower than that of bare AZ31. This study provides a new insight into the scalable application of metal oxide nanosheets in metal anticorrosion coatings. © 2025 Elsevier B.V.

关键词： Fourier transform infrared spectroscopy

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Strongly enhancing the energy storage properties and stability of amorphous BaTiO3 thin films via ions doping

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Scripta materialia 2025年 265卷

作者： Chang, Ruiling Yao, Zhonghua Xing, Yutong Wang, Jun Hao, Hua Cao, Minghe Liu, Hanxing State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China

Amorphous thin films with high power density and breakdown strength satisfy the needs of advanced power electronic systems. Nonetheless, improving the energy storage density of amorphous films is critical for addressing the growing demand for electricity. We apply high spontaneous polarization BaTiO3 as the main component to make (1-x)Ba(Ti0.99Mn0.02)O3-xBiFeO3((1-x)BTM-xBF) thin films. Doping BiFeO3 (BF) synergistically boosts polarization. The introduction of amorphous phases and Mn ions enhances the breakdown strength. The results demonstrate that, at x = 0.10, the film can achieve both a high efficiency of 80.3 % and an excellent energy storage density of 111.3 J cm-3. Moreover, the film has a strong thermal stability within a broad range of 20 to 160 °C, as well as the cycling reliability is as high as 105 times. The present study offers a practical approach to develop film capacitors with outstanding energy storage capabilities. © 2025 Acta materialia Inc.

关键词： Amorphous films

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PTCDA/CuS cathode enabling stable sulfide-based all-solid-state batteries

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Journal of Materiomics 2025年

作者： Zhixing Wan Shuo Wang Yahao Mu Ruihua Zhou Hang Liu Tingwu Jin Di Wu Jianlong Xia Ce-Wen Nan Center of Smart Materials and Devices State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan 430070 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Organic cathode materials have garnered significant attention for their potential application in lithium-ion batteries due to their lightweight nature, tunable structures, high energy density, and environmental friendliness. However, the dissolution of organic cathodes in liquid electrolytes often leads to poor cycling stability, which limits their practical application. In this study, a composite cathode was prepared by ball milling the PTCDA/CuS (perylene-3,4,9,10-tetracarboxylic dianhydride, PTCDA) with a sulfide-based electrolyte and carbon nanotubes. By optimizing the component ratios, the assembled all-solid-state batteries (ASSBs) show a high discharge capacity of 210 mA⸱h/g after 200 cycles without any capacity degradation at a current density of 33.0 mA/g. Through comprehensive characterization techniques including X-ray diffraction (XRD), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), the coordination of Cu 2+ and the formation of sulfur-linked polymers during the charge-discharge processes are elucidated, and the reversibility of the electrochemical reactions has been confirmed. This work highlights the excellent compatibility between organic cathodes and sulfide-based electrolytes, providing a new way for the development of high-performance ASSBs with high energy density and extended lifespan.

关键词： PTCDA/CuS lithium argyrodite organic cathode all-solid-state battery

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Triethanolamine-mediated photodeposition formation of amorphous Ni-P alloy for improved H2-evolution activity of g-C3N4

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Science China materials 2020年第11期63卷 2215-2227页

作者： Huogen Yu Jiachao Xu Duoduo Gao Jiajie Fan Jiaguo Yu Department of Chemistry School of ChemistryChemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Developing efficient,stable,and low-cost novel electron-cocatalysts is crucial for photocatalytic hydrogen evolution ***,amorphous Ni-P alloy particles were successfully modified onto g-C3N4 to construct the Ni-P/g-C3N4 photocatalyst through a simple and green triethanolamine(TEOA)-mediated photodeposition *** was found that the TEOA could serve as an excellent complexing agent to coordinate with Ni2+to form[Ni(TEOA)]^2+complex,which can promote the rapid and effective deposition of amorphous Ni-P alloy on the g-C3N4 *** tests suggest that the hydrogen-evolution performance of gC3N4 can be greatly promoted through integrating amorphous Ni-P ***,the Ni-P/g-C3N4(5 wt%)exhibits the superior H2-generation activity(118.2μmol h^-1g^-1),which is almost 35.8 times that of bare ***,the amorphous Ni-P alloy cocatalyst can also serve as the general hydrogen-production cocatalyst to greatly enhance the photocatalytic performance of traditional semiconductor materials such as Ti O2 and Cd *** on the present results,the mechanism of the amorphous Ni-P alloy as the high-efficiency electron transfer medium was proposed for the boosted H2-generation *** present facile route may broaden the horizons for the efficient development of highly active cocatalysts in photocatalytic field.

关键词： photocatalysis H2evolution g-C3N4 amorphous NiP alloy photodeposition

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