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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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Direct Laser Printing of 3d Optical Imaging Based on Full-Spectrum Solar-Absorption-Enhanced Perovskite-Type Oxides

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SSRN 2023年

作者： Luo, Xiaobo Hu, Songhan Duan, Qiudong Zhou, Dacheng Wang, Qi Yang, Yong Chen, Jialin Wen, Yugeng Qiu, Jianbei Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming650093 China Key Lab. of Advanced Materials of Yunnan Province Kunming650093 China Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang110819 China School of Materials Science and Engineering Northeastern University Shenyang110819 China Key Laboratory of Advanced Technologyies for Comprehensive Utihzatron of Platinum Metal China

The exploration of the solar light absorption by a material is of great use in photonics and optoelectronics. However, the fully exploiting of the solar spectrum of well-known wide-bandgap perovskite oxides (2.7–5 eV), remains very challenging. We show that the selective occupation of Bi3+ in the octahedrally coordinated Ba2+ is responsible for creating sub-bandgap states (as low as 0.6 eV), nearly 9 times lower than pristine bandgap (5.2 eV). We reveal that the role of the 6s6p excited state of Bi3+ is as a bridge to promote the dipole-allowed band-band transition for strong absorption. Furthermore, we demonstrate the double-sided laser printing of three-dimensional optical imaging based on the photothermal effect, enabling write-once-read-many information storage with ultrahigh stability and good data retention. Our results make Ba3–xGa2O6:xBi3+ a promising candidate for photovoltaics, ferroelectrics, photocatalysis, broadband photodetectors as well as other photonic and optoelectronic applications. © 2023, The Authors. All rights reserved.

关键词： Light absorption

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Effect of Magnetic Field Annealing on the Soft Magnetic Properties of Cofesib Ribbon and its Fluxgate Performance

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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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One-pot fabrication of FePt/reduced graphene oxide composites as highly active and stable electrocatalysts for the oxygen reduction reaction

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Carbon 2014年 68卷 755-762页

作者： Dan Chen Xin Zhao Shanshan Chen Huifeng Li Xinning Fu Qingzhi Wu Shipu Li Yu Li Bao-Lian Su Rodney S. Ruoff State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Biomedical Material and Engineering Center Wuhan University of Technology Wuhan 430070 China Department of Mechanical Engineering and the Materials Science and Engineering Program The University of Texas at Austin 1 University Station C2200 Austin TX 78712 USA Laboratory of Inorganic Materials Chemistry University of Namur 61 rue de Bruxelles B-5000 Namur Belgium Clare Hall College University of Cambridge Cambridge UK

FePt nanoparticles (NPs)/reduced graphene oxide (rG-O) composites have been synthesized using a one-pot strategy without surfactants. Monodisperse FePt NPs were homogenously loaded onto rG-O sheets. By controlling the concentration of dispersed graphene oxide (GO), uniform FePt flower-like nanoclusters can be obtained. FePt/rG-O composites exhibited exceptionally high electrocatalytic performance in the activity and durability for the oxygen reduction reaction (ORR), much superior to that of the commercial Pt/C (60%). The straightforward synthesis of FePt/rG-O composites provides a low-cost and high performance catalyst for the ORR, which is also a promising strategy for the synthesis of various Pt-based bimetallic alloy/rG-O composites for potential uses in catalysis and energy fields.

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Microstructural characterization of the Mg/Cu/Al diffusion bonded joint

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Journal of Physics: Conference Series 2013年第1期419卷

作者： Jian Zhang Qiang Shen Guoqiang Luo Yiyu Wang Meijuan Li Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A vacuum hot-pressed diffusion bonding method was used to prepare an Mg/Cu/Al laminated composite. Both the Mg/Cu and Al/Cu interfaces were investigated by means of scanning electron microscopy, electron probe microanalysis, X-ray diffraction spectrometer system and Vickers microhardness test. The results showed that two kinds of intermetallic compounds, Al4Cu9 adjacent to the Cu side and Al2Cu adjacent to the Al side, were formed in the interface of Al-Cu. Meanwhile, Mg2Cu was formed at the interface of Mg/Cu. The maximum value of shear strength is 13.1 MPa and the fracture of the joints had taken place at the Mg-Cu interface. The microhardness of the interface increased due to the formation of the intermetallic compounds, which is the main cause leading to poor bond properties.

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Ammonium [email protected] @manganese dioxide nanowire arrays with enhanced reversible lithium storage

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Applied Surface Science 2017年 416卷 402-410页

作者： Chang Wang Hui Liu Ming Jiang Yingde Wang Ruina Liu Zhiping Luo Xiaoqing Liu Weilin Xu Chuanxi Xiong Dong Fang College of Material Science and Engineering State Key Lab for New Textile Materials & Advanced Processing Technology Key Laboratory for New Textile Materials and Applications of Hubei Province Wuhan Textile University Wuhan 430070 PR China School of Metallurgy and Environment Central South University Changsha 410083 PR China Science and Technology on Advanced Ceramic Fiber and Composites Laboratory National University of Defense Technology Changsha 410073 PR China Department of Chemistry and Physics Fayetteville State University Fayetteville NC 28301 USA School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 PR China

Design and fabrication of novel optimized electrode materials are important for the development of new batteries for energy storage applications. Herein, we report on a hierarchical bulk electrode material with a tailored nanostructure that which consists of three components: a NH 4 V 4 O 10 nanowire as an active skeleton, an intermediate polymer layer (polypyrrole, PPy), and a metal oxide layer (MnO 2 ) as the outside shell. The NH 4 V 4 O 10 -PPy-MnO 2 nanowires exhibit present higher capacitance than that of the simple NH 4 V 4 O 10 -PPy [email protected] or NH 4 V 4 O 10 nanowires. The structure of double shells of combined PPy and MnO 2 is a key factor in enhancing their electrochemical performance including high specific capacitance and excellent cycling stability. Our V-based [email protected] @shell structure can serve as freestanding, compressible electrodes for various energy devices.

关键词： Ammonium vanadate Nanowire array [email protected] @shell structure Lithium ion battery

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Corrosion Behavior of SnO2-based Electrode Ceramics in Soda-lime Glass Liquid

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IOP Conference Series: materials Science and Engineering 2011年第20期18卷

作者： Guoqiang Luo Qiang Shen Qizhong Li Dongming Zhang Chuanbin Wang Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Dense SnO2-based electrode ceramics have extensive application prospect in glass electric-melting industry due to the excellent electrically-conductive and chemical property in high temperatures and oxidation environment. In this paper, dense SnO2-based electrode ceramics doped with MnO2 and Sb2O3 were prepared by pressureless sintering method and the corrosion rate in soda-lime glass liquid as well as the microstructure evolution was mainly investigated. The results suggested that SnO2-based ceramics had good corrosion resistance, and the minimum value was only 2.54×10−4 mm/h when MnO2 content is 1.0% and Sb2O3 content is 0.1%. Composition Elements of Glass liquid were detected in the grain boundary and some intergranular pores. It was found that SnO2 grains remained unchanged, whereas MnO2 was easily dissolved into molten glass liquid. SnO2-based electrode ceramics with dense structure and few amounts of additives had excellent corrosion resistance to the molten glass.

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Fabrication of ATO/Graphene Multi-layered Transparent Conducting Thin Films

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Journal of Physics: Conference Series 2013年第1期419卷

作者： Na Li Fei Chen Qiang Shen Chuanbin Wang Lianmeng Zhang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A novel transparent conducting oxide based on the ATO/graphene multi-layered thin films has been developed to satisfy the application of transparent conductive electrode in solar cells. The ATO thin films are prepared by pulsed laser deposition method with high quality, namely the sheet resistance of 49.5 Ω/sq and average transmittance of 81.9 %. The prepared graphene sheet is well reduced and shows atomically thin, spotty distributed appearance on the top of the ATO thin films. The XRD and optical micrographs are used to confirm the successfully preparation of the ATO/graphene multi-layered thin films. The Hall measurements and UV-Vis spectrophotometer are conducted to evaluate the sheet resistance and optical transmittance of the innovative structure. It is found that graphene can improve the electrical properties of the ATO thin films with little influence on the optical transmittance.

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Amino-Functionalized and Na+ Pre-Intercalated Three Dimensional Ti3c2tx Film Aerogel with Excellent Electrochemical Performances for Supercapacitor

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SSRN 2024年

作者： Guo, Xiaohui Jin, Xinhui Mo, Dejie Feng, Lirong Wang, Dong Su, Baolian Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education The College of Chemistry and Materials Science Northwest University Xi’an710069 China Department of inorganic chemistry University of Namur 61 rue de Bruxelles NamurB-5000 Belgium Xinjiang University China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Precise modulation of the pore structure and modification of the surface groups (-NH2) of MXene aerogels by the solid foaming method in combination with Na+ pre-intercalation can significantly increase the layer spacing and change the electronic structure of MXene, thereby significantly optimizing its electrochemical performance. The three dimensional (3D) network structure provides numerous active sites on the surface of MXene and provides more ion transfer pathways, and the large layer spacing allows electrolyte ions fast transport, and the surface groups provide more active sites for the pseudocapacitive reaction. As a result, the prepared Na-Ti3C2Tx film aerogel delivers a high mass specific capacity of 560 F g-1 and excellent cycling performance of 94.5% capacity retention after 12,000 cycles in 0.5 M H2SO4. In addition, the flexible all-solid-state supercapacitor (ASC) composed of MXene film electrodes has excellent specific capacitance ~ 277 F g-1 and high energy density ~ 52.8 Wh kg-1 at 1600 W kg-1. Therefore, this work not only proposes a feasible synthetic method that can precisely regulate the pore structure and surface features of film aerogels, but also demonstrates the broad application prospects of aerogel materials in wearable power devices. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

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Transient thermochemical analysis of liquefied petroleum gas vessel under pool fire surrounding

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/...

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2005年第2期29卷 190-193页

作者： Yin, Qizhi Xiao, Jinsheng Zhao, Zaili Yang, Bo Sch. of Energy and Power Engineering Wuhan Univ. of Technol. Wuhan 430063 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan Univ. of Technol. Wuhan 430072 China

The transient temperature field analysis aims at the thermal response of LPG vessel under pool fire surrounding environment. The finite element analysis method is used to calculate the temperature field. The thermal boundary conditions of LPG vessel are determined according to heat transfer theory and calculated by the software PLGS99. The results show that the maximum temperature gradient of vessel appears near the highest surface where the liquid can reach, and fluctuation of liquid surface is the main reason of high temperature gradient.

关键词： Finite element analysis Liquefied petroleum gas Pressure vessel Temperature field

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