检索结果-内蒙古大学图书馆

Tuning the strength of built-in electric field in 2D/2D g-C_(3)N_(4)/MS_(2) and g-C_(3)N_(4)/ZrS_(2) S-scheme heterojunctions by nonmetal doping

学校读者我要写书评

暂无评论

Journal of Materiomics 2021年第5期7卷 988-997页

作者： Bicheng Zhu Haiyan Tan Jiajie Fan Bei Cheng Jiaguo Yu Wingkei Ho State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology122 Luoshi RoadWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China Department of Science and Environmental Studies The Education University of Hong KongTai PoN.T.Hong Kong999077China

Single photocatalysts usually exhibit unsatisfactory performance due to the serious recombination of photogenerated electron‒hole *** two photocatalysts to construct S-scheme heterojunction could solve this *** S-scheme mechanism,the interfacial built-in electric field(IEF)provides a vital driving force for efficient charge *** the IEF is a feasible strategy to further improve the photocatalytic ***,a novel idea of tuning the strength of IEF in 2D/2D graphitic carbon nitride(g-C_(3)N_(4))/MS2(M=Sn,Zr)S-scheme heterojunctions by nonmetal doping was developed by employing density functional theory *** nonmetal elements(O,P,and S)were severally introduced into g-C_(3)N_(4)/MS_(2) *** density difference suggested that O and S doping led to increased interfacial electron transfer,while P doping had minimal *** expected,the calculated field strength of O-and S-doped g-C_(3)N_(4)/MS_(2) composites was significantly larger than that of pristine and P-doped g-C_(3)N_(4)/MS_(2) ***,O and S doping endowed g-C_(3)N_(4)/MS_(2) Sscheme heterojunctions with enhanced IEF and more thorough charge ***,the experimentally synthesized O-C_(3)N_(4)/ZrS_(2) composite exhibited better photocatalytic H2-production activity than g-C_(3)N_(4)/ZrS_(2) *** work proposed an original idea of employing proper nonmetal doping to magnify the advantage of S-scheme heterojunction in accelerating charge separation.

关键词： Graphitic carbon nitride Density functional theory Field strength Photocatalysis Van der Waals heterostructure

Cellulose Composite Kvo Films and Self-Healing Loc Gel Electrolyte for Multifunctional Flexible Electrochromic Device

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Sun, Shuokun Xia, Xiaoyan Gao, Mingrui Wei, Wei Cui, Shichuang Zhu, Quanyao School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Hubei Wuhan430070 China Department of Physics Changji University Xinjiang Changji831100 China

Electrochromic materials have attracted intensive attention due to friendly relationship to the environment, energy and user experience. Layered vanad-based compounds are considered as one kind of the most promising electrochromic materials. However, they are plagued by the appearance of ion channel collapse, capacity loss, and aqueous electrochromic materials exhibit poor cycling stability. Herein, we report on KV3O8·0.75H2O (KVO) and further complexed it into a network formed by linear methylcellulose, realizes a stand-alone cellulose composite KVO electrochromic film. K doping destroys the preferred orientation of V2O5 (002) crystal plane and expands the interplanar spacing to 6.9 Å. Cellulose significantly increases the viscosity of the sol (6 times) and acts as a "strengthener". Firstly, the electrochromic properties of methylcellulose composite KVO film (KVO/MC) were studied in 1 mol L-1 LiClO4 nonaqueous electrolyte. The film can freely switch between green-yellow and orange-red, and can retain more than 67% of the charge capacity after 2000 cycles. We further introduce flexible electrochromic devices assembled from KVO/MC films. Development of a self-healing LOC-based gel electrolyte composed of Ethene, 1-chloro-1,2,2-trifluoro-, polymer with 1,1- difluoroethene (P(CTFE-VDF)) and Li+ electrolyte, which is highly consistent with the device. It has a high colouring efficiency of 78.8 cm2 C -1 , achieving fast response (≤5.6 s) and long service life (>77% of the charge capacity and 70% of the optical contrast after 10000 cycles). This design shows great application potential in manufacturing large-area (20×30 cm2 ) flexible devices. © 2023, The Authors. All rights reserved.

关键词： Electrochromism

Approaching strain limit of two-dimensional MoS_(2) via chalcogenide substitution

学校读者我要写书评

暂无评论

Science Bulletin 2022年第1期67卷 45-53,M0004页

作者： Kailang Liu Xiang Chen Penglai Gong Ruohan Yu Jinsong Wu Liang Li Wei Han Sanjun Yang Chendong Zhang Jinghao Deng Aoju Li Qingfu Zhang Fuwei Zhuge Tianyou Zhai State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Department of Physics Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research CenterWuhan University of TechnologyWuhan 430070China Institutes of Physical Science and Information Technology Anhui UniversityHefei 231699China School of Physics and Technology Wuhan UniversityWuhan 430072China

Strain engineering is a promising method for tuning the electronic properties of two-dimensional(2 D)materials,which are capable of sustaining enormous strain thanks to their atomic ***,applying a large and homogeneous strain on these 2D materials,including the typical semiconductor MoS_(2),remains *** we report a facile strategy for the fabrication of highly strained MoS_(2) via chalcogenide substitution reaction(CSR)of MoTe_(2) with lattice *** MoS_(2)resulting from the sulfurized MoTe_(2) sustains ultra large in-plane strain(approaching its strength limit~10%)with great ***,the strain can be deterministically and continuously tuned to~1.5%by simply varying the processing *** to the fine control of our CSR process,we demonstrate a heterostructure of strained MoS_(2)/MoTe_(2)with abrupt ***,we verify that such a large strain potentially allows the modulation of MoS_(2) bandgap over an ultra-broad range(~1 e V).Our controllable CSR strategy paves the way for the fabrication of highly strained 2D materials for applications in devices.

关键词： Strain engineering 2D materials Chalcogenide substitution Controllable strain Lattice inheritance

Delayed Recrystallization Behavior and Deformation Mechanism of In738lc Alloy Prepared by Laser Powder Bed Fusion

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Hu, Yong Jia, Huibin Zhang, Xu Liu, Bo Xu, Jiayu Yang, Xiaokang Gao, Yubi Ding, Yutian Zhang, Dong School of Material Science and Engineering Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Gansu Lanzhou730050 China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Gansu Jinchang737100 China

Developing and designing heat treatment regimes suitable for L-PBF technology has become a research hot spot in the field of AM, based on the specific service conditions for preparing alloys. To achieve this goal, the present study selects the IN738LC alloy produced by L-PBF as the subject and then uses multiple characterization methods and quantitative analysis to meticulously examine the microstructure alterations of this alloy at 1250°C during various solution treatment duration (1 hour, 3 hours, 5 hours), examines the delayed re-crystallization behavior of the alloy, explores the selective precipitation pattern of M23C6 carbides on various types of grain boundaries during the recrystallization process, and clarifies the mechanism of tensile deformation of the alloy before and after heat treatment. It was showed that at 1250 °C/1 h, the nanoscale carbides at the boundaries of the cellular structure grew up, and the micro-segregation of Nb and Ti was removed. Due to carbide particle pinning and solute atom segregation dragging, grain boundary migration and transformation were hindered during the initial stage of solid solution treatment, resulting in delayed recrystallization and mainly recovery for the alloy. The alloy underwent recrystallization at 1250°C/5 h, resulting in the selective precipitation of M23C6 carbides at the twin boundaries. The mechanical property tests demonstrate that the samples made at 1250°C/1 h have the highest yield strength (σYS=1305±21 MPa) and tensile strength (σUTS=1462±11 MPa) due to the precipitation of the γ′ phase. Simultaneously, the presence of a considerable number of subgrain boundaries ensures a certain plasticity (ΕEL=5.4±0.7%). The tensile deformation mechanism indicates that the as-built IN738LC alloy mainly deforms through planar slip of dislocations, while the heat-treated samples deform through stacking faults shearing and anti-phase boundaries (APB) shearing at varying times. The APB cutting mechanism is more readily

关键词： Recrystallization (metallurgy)

CdS nanosheets decorated with Ni@graphene core-shell cocatalyst for superior photocatalytic H_(2) production

学校读者我要写书评

暂无评论

Journal of materials Science & technology 2020年第21期56卷 170-178页

作者： Tingmin Di Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China

A novel cocatalyst,*** nickel nanoparticles encapsulated in few-layer graphene(Ni@C),is obtained by carbonization of metal–organic frameworks(MOF)and leaching treatment of hydrochloric *** is selected as the cocatalyst for CdS nanosheets,forming CdS-Ni@C *** remarkably improves the photocatalytic activities of CdS nanosheets due to the synergistic effect of Ni nanoparticles and graphene *** addition,the Ni nanoparticles encapsulated by graphene layers effectively isolate Ni from the ambient,which avoids contamination and curbs *** larger work function of Ni@C and outstanding conductivity of graphene promote the electron transfer from CdS to Ni@C,suppressing the recombination of photogenerated carriers and facilitating the separation of photogenerated electronhole *** strategy by adopting this novel cocatalyst provides a new solution to the improvement of the photocatalytic hydrogen production.

关键词： CdS nanosheets Photocatalytic hydrogen production Nickel Graphene Core-shell cocatalyst Metal-organic frameworks(MOF)

First-principles study on Pr-doped Bilayer Nickelate La3Ni2O7

学校读者我要写书评

暂无评论

arXiv

arXiv 2025年

作者： Huo, Zihao Zhang, Peng Shi, Haoliang Yan, Xiaochun Duan, Defang Cui, Tian Key Laboratory of Material Simulation Methods & Software of Ministry of Education State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun130012 China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi’an Jiaotong University Xi’an710049 China Institute of High Pressure Physics School of Physical Science and Technology Ningbo University Ningbo315211 China

Recently, the Pr-doped Ruddlesden-Popper phase of bilayer nickelate La3Ni2O7 has been reported to exhibit a superconducting transition temperature (Tc) of 82.5 K and superconducting volume fraction of about 57 % at high pressure. However, the effect of Pr-doping on La3Ni2O7 remains unclear. Here, we studied the crystal structures and electronic properties of Pr-doped La3Ni2O7 at 0 and 15 GPa based on the first-principles calculations to explore the doping effect of Pr. Our findings indicate that the praseodymium atoms prefer to occupy the outer La-O layers site. We then investigated the evolution of crystal structures in both the ambient pressure phase and high pressure phase of La3Ni2O7 as a function of doping concentration, revealing inconsistent trends in their evolution with increasing doping levels. Finally, by fitting the bilayer two-orbital model, we propose that doping Pr may benefit for superconductivity of La3Ni2O7. These results not only can help the further experimental search of RP phase nickelate at lower pressure, but also provide helpful guide for understanding the effect of chemical pressure in isovalent doped RP phase nickelate superconductor. Copyright © 2025, The Authors. All rights reserved.

关键词： Superconducting transition temperature

3D nonlinear photolithography of tin oxide ceramics via femtosecond laser

学校读者我要写书评

暂无评论

Science China materials 2021年第6期64卷 1477-1484页

作者： Nianyao Chai Yanan Liu Yunfan Yue Ping Wei Xuewen Wang Junjie Zhao Qi Zhang Fuzhi Huang Zhongle Zeng Zongsong Gan Liqiang Mai Yibing Cheng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryFoshan 528216China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

As a wide band gap semiconductor material,tin oxide(SnO_(2))has been widely used in gas sensing,optoelectronics and *** complex micro and nanoscale threedimensional(3D)geometric structures endow the conventional SnO_(2)ceramics with novel properties and ***,ceramics cannot be cast or machined easily due to their high mechanical toughness and *** additive manufacturing opens a great opportunity for flexibly geometrical shaping,while the arbitrary shaping of SnO_(2)ceramics at micro and nanoscale is always a ***,preceramic monomers which can be polymerized under ultrafast laser irradiation,were utilized to form complex and arbitrary 3D preceramic polymer *** calcination treatment,these green-body structures could be converted into pure high-dense SnO_(2)ceramics with uniform shrinkage,and the feature size was down to *** electron microscopy(TEM)analysis displays that the printed SnO_(2)ceramic nanostructures can be nanocrystallized with grain sizes of 2.5±0.4 *** work provides the possibility of manufacturing 3D SnO_(2)ceramic nanostructures arbitrarily with sub-100 nm resolution,thus making it promising for the applications of SnO_(2)in different fields.

关键词： tin oxide ceramics nonlinear photolithography femtosecond laser

Achieving Enhanced Strength Retention in Ultrafine-Fibrous Interconnected Al-Based Ternary Eutectic Alloy at Elevated Temperatures

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Gan, Zhanghua Li, Yingyu Zhang, Penghui Wu, Chuandong Shen, Shuai Huang, Yuanyuan Zhong, Songqiang Yang, Tian Luo, Guoqiang Liu, Jing State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Hubei Wuhan430081 China 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 College of Materials Science and Engineering Shenzhen University Shenzhen518000 China

Certain two-phase regions with coarse structure could be usually detected concurrently along with three-phase eutectics in ternary eutectic alloy, leading to the formation of heterogeneous structure with limited ductility. In this study, Al-Ce-Ni eutectic alloy was chosen as modal system, which was firstly reported to be solidified under super-gravity field with high volume fraction of three-phase eutectics. Meanwhile, the formation of ultrafine-fibrous interconnected Al11Ce3-Al3Ni eutectic clusters with more "chains" and higher spatial connectivity was detected mainly due to the relatively higher nucleation rate. The high volume fraction and refinement of interconnected Al11Ce3-Al3Ni eutectic clusters with excellent thermal stability could contribute to enhancement of ductility and tensile strength at elevated-temperature. Interestingly, the strength retention at 300 oC and 400 oC were able to reach up to ~68.1 % and ~33.2 %, respectively. © 2023, The Authors. All rights reserved.

关键词： Solidification

Achieving Wideband Electromagnetic Wave Absorbing Performance for Pmma-Based Composites Foam by Designing the Alternating Directional (Ad) Microporous Structure

学校读者我要写书评

暂无评论

SSRN 2023年

作者： Zhou, Danfeng Yu, Zirui Yuan, Huan Luo, Guoqiang Hu, Ruofei Jiang, Xueliang Shen, Qiang Hubei Key Laboratory of Plasma Chemistry and New Materials School of Material Science and Engineering Wuhan Institute of Technology Hubei Wuhan430205 China 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 Department of Food Science & Chemical Engineering Hubei University of Arts and Science Xiangyang441053 China

Good impedance matching and attenuation ability of electromagnetic wave absorbing (EMA) materials are required to broaden the effective absorbing bandwidth (EAB) and lower minimum reflection loss (RLmin), achieving high EMA performance. Here we report a PMMA- based composite foam with alternating and directional (AD) microporous structure with broadened EAB of 3.53 GHz (8.49-12.02 GHz) and lowers RLmin of -19.35 dB, was manufactured via the one-step physical constraint foaming technology. Structural studies reveal that the AD microporous structure can induce the CNTs oriented distribution to improve effective concentration of CNTs, achieving excellent impedance matching. Meanwhile, it can also generate a large number of parallel-plate capacitors among the multiple interfaces to promote interfacial polarization, including enhancement of multiple reflection and scattering of electromagnetic wave at the multiple interfaces, endowing composites foam with high attenuation ability. This study lays the foundation for rational design and synthesis of EMA materials for broadband EMA performance. © 2023, The Authors. All rights reserved.

关键词： Electromagnetic wave absorption