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Ultrastrong and ductile(CoCrNi)_(94)Ti_(3)Al_(3)medium-entropy alloys via introducing multi-scale heterogeneous structures

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Journal of materials Science & technology 2023年第4期135卷 241-249页

作者： Jianying Wang Jianpeng Zou Hailin Yang Xixi Dong Peng Cao Xiaozhou Liao Zhilin Liu Shouxun Ji State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Brunel Centre for Advanced Solidification Technology(BCAST) Brunel University LondonUxbridgeMiddlesex UB83PHUnited Kingdom Department of Chemical and Materials Engineering The University of Auckland1142New Zealand School of Aerospace Mechanical&Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia Light Alloy Research Institute College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China

The coarsening-grained single-phase face-centered cubic(fcc)medium-entropy alloys(MEAs)normally exhibit insufficient strength for some engineering ***,superior mechanical properties with ultimate tensile strength of 1.6 GPa and fracture strain of 13.1%at ambient temperature have been achieved in a(CoCrNi)_(94)Ti_(3)Al_(3)MEA by carefully architecting the multi-scale heterogeneous *** microscopy characterization indicates that the superior mechanical properties mainly originated from the favorable heterogeneous fcc matrix(1-40μm)and the coherent sphericalγ’precipitates(10-100 nm),together with a high number density of crystalline defects(2-10 nm),including dislocations,small stacking faults,Lomer-Cottrell locks,and ultrafine deformation twins.

关键词： Medium-entropy alloys Mechanical properties Heterogeneous structure γ’nanoprecipitates Crystalline defects

Ultrafine ordered L1_(2)-Pt-Co-Mn ternary intermetallic nanoparticles as high-performance oxygen-reduction electrocatalysts for practical fuel cells

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Journal of Energy Chemistry 2024年第6期93卷 157-165,I0005页

作者： Enping Wang Liuxuan Luo Yong Feng Aiming Wu Huiyuan Li Xiashuang Luo Yangge Guo Zehao Tan Fengjuan Zhu Xiaohui Yan Qi Kang Zechao Zhuang Daihui Yang Shuiyun Shen Junliang Zhang China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 201306China Institute of Fuel Cells Key Laboratory for Power Machinery and Engineering of MOESchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Tangfeng Energy Technology Co.Ltd. Shanghai 201306China State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003GuizhouChina School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China Department of Chemical Engineering Columbia UniversityNY 10027USA

The long-range periodically ordered atomic structures in intermetallic nanoparticles(INPs)can significantly enhance both the electrocatalytic activity and electrochemical stability toward the oxygen reduction reaction(ORR)compared to the disordered atomic structures in ordinary solid-solution alloy ***,through a facile and scalable synthetic method,a series of carbon-supported ultrafine Pt_3Co_(x)Mn_(1-x)ternary INPs are prepared in this work,which possess the"skin-like"ultrathin Pt shells,the ordered L1_(2) atomic structure,and the high-even dispersion on supports(L1_(2)-Pt_3Co_(x)Mn_(1-x)/~SPt INPs/C).Electrochemical results present that the composition-optimized L1_(2)-Pt_3Co_(0.7)Mn_(0.3)/~SPt INPs/C exhibits the highest electrocata lytic activity among the series,which are also much better than those of the pristine ultrafine Pt/***,it also has a greatly enhanced electrochemical *** addition,the effects of annealing temperature and time are further *** importantly,such superior ORR electrocatalytic performance of L1_(2)-Pt_3Co_(0.7)Mn_(0.3)/~SPt INPs/C are also well demonstrated in practical fuel *** characterization analyses further reveal the major origins of the greatly enhanced ORR electrocata lytic performance:the Pt-Co-Mn alloy-induced geometric and ligand effects as well as the extremely high L1_(2) atomic-ordering *** work not only successfully develops a highly active and stable ordered ternary intermetallic ORR electrocatalyst,but also elucidates the corresponding"structure-function"relationship,which can be further applied in designing other intermetallic(electro)catalysts.

关键词： Platinum Cobalt Manganese Oxygen reduction reaction Ordered intermetallic L1_(2)atomic structure Proton-exchange membrane fuel cell

Controlling Aluminum Oxidation in Cuinal Precursor Films: Significance for Achieving High-Performance Cu(Inal)Se2 Solar Cells

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SSRN 2023年

作者： Han, Junsu Zhao, Ming Zhuang, Daming Wang, Hanpeng Tong, Hao Tao, Shengye Dong, Liangzheng Jia, Mengyao Wang, Yafei School of Materials Science and Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Tsinghua University Beijing100084 China State Key Laboratory for New Ceramics and Fine Processing Tsinghua University Beijing100084 China College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan030024 China

In this work, we demonstrate the effects of aluminum and aluminum oxide within CuInAl precursor films on the formation process of Cu(InAl)Se2 (CIASe) thin films. We carried out a large number of experiments to optimize the conditions for obtaining CIASe thin films with excellent adhesion and electrical properties. Our findings suggest that the fabrication conditions of the precursor films, such as the vacuum level of sputtering chamber and the structure of the precursor films, significantly affect to the growth of the CIASe layer during selenization annealing. Through a series of experiments, we successfully obtained a 2.4 μm-thick CIAS thin film with strong adhesion to the Mo-coated substrate and fabricated a CIASe solar cell with an efficiency of 7.7%. Our study demonstrates the great potential of the two-step fabrication approach for CIASe thin film production, and further improvements are expected by optimizing the fabrication conditions. © 2023, The Authors. All rights reserved.

关键词： Thin films

Broadband achromatic metalens design based on artificial neural network

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Broadband achromatic metalens design based on artificial neu...

CLEO: QELS_Fundamental Science, QELS 2022

作者： Wang, Feilou Geng, Guangzhou Wang, Xueqian Li, Junjie Bai, Yang Li, Jianqiang Wen, Yongzheng Li, Bo Sun, Jingbo Zhou, Ji State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China CAS Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China Tsinghua Shenzhen International Graduate School Shenzhen518055 China

We used the backpropagation neural network to design a high performance achromatic metalens at visible range. Experimental demonstration showed that the fabricated achromatic metalens can operate from 420 to 640 nm wi... 详细信息

ISBN: (纸本)9781557528209

关键词： Neural networks

Construction of a Sustainably No-Releasing Rgdc Grafted Chitosan Oriented Peripheral Nerve Scaffold

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SSRN 2025年

作者： Zhao, Wenxuan Chen, Yuzhe Wu, Xiaopei Dong, Xianzheng Dai, Honglian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City Zhongshan528400 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan430200 China

Peripheral nerve regeneration is impeded by an imbalanced microenvironment involving inflammation, oxidative stress, and inadequate vascularization. Traditional drug therapies are limited by poor blood-nerve barrier penetration and lack of multifunctional efficacy. Nitric oxide (NO), a critical gasotransmitter, promotes nerve repair by enhancing axonal growth, synaptic plasticity, and cell survival, while exerting anti-inflammatory, antioxidant, and pro-angiogenic effects. However, uncontrolled NO release risks cytotoxicity. To address this, we engineered a multifunctional hydrogel by grafting RGDC peptides onto chitosan to create an oriented microstructure, incorporating glutathione as a precursor for S-nitrosoglutathione (GSNO), a sustained NO donor. This design combines structural guidance with controlled NO delivery and antioxidant activity. The hydrogel demonstrated excellent biocompatibility and sustained NO release, avoiding cytotoxic levels. The RGDC peptide enhanced cell adhesion and migration, while GSNO effectively reduced intracellular reactive oxygen species (ROS) and promoted human umbilical vein endothelial cell (HUVEC) angiogenesis. The integrated system synergistically modulates the regenerative microenvironment by mitigating oxidative stress, supporting vascularization, and guiding cellular behavior. This strategy overcomes limitations of conventional treatments by combining structural alignment, controlled gasotransmitter release, and multifunctional bioactivity, offering a promising translational solution for peripheral nerve repair. © 2025, The Authors. All rights reserved.

关键词： Scaffolds

One-Step Preparation of Feconicral Nanoparticle/Graphene Nanosheet Composites Via Electrical Explosion for Efficient Electromagnetic Wave Absorption

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SSRN 2024年

作者： Wei, Yupeng Zhang, Meng Wu, Jiawei Yu, Yanhong Zhou, Hui Wang, Xudong Chen, Shan Xiao, Rongzhen Zhu, Liang School of Materials Science and Engineering State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology Lanzhou730050 China State Key Laboratory of Special Rare Metal Materials Northwest Rare Metal Materials Research Institute Ningxia Co.Ltd. Ningxia Shizuishan753000 China School of Materials Engineering Lanzhou Institute of Technology Lanzhou730050 China

Magnetic metal/graphene composites are highly attractive for lightweight electromagnetic wave absorbing materials. FeCoNiCrAl nanoparticle/graphene nanosheet composites were successfully synthesized via a one-step physical electrical explosion. The graphite was transformed into graphene nanosheets and a few flocculent nanocarbon during the electrical explosion, and FeCoNiCrAl nanoparticles with bcc structure were dispersed on graphene nanosheets. The electromagnetic characteristics and microwave absorption performance of FeCoNiCrAl nanoparticle/graphene nanosheet composites with different FeCoNiCrAl contents were systematically analyzed. The reflection loss (RL) of FeCoNiCrAl nanoparticle/graphene nanosheet composites with 15 wt.% FeCoNiCrAl was -44.2 dB at 17.5 GHz. FeCoNiCrAl nanoparticle/graphene nanosheet composites with 15 wt.% FeCoNiCrAl had the strongest radar cross section (RCS) reduction value of up to 34.74 dB m2 with a scattering angle of 0°. This study provided new insights into the design of lightweight electromagnetic wave absorbing materials. © 2024, The Authors. All rights reserved.

关键词： Iron alloys

Simulations of monolayer SiC transistors with metallic 1T-phase MoS_(2) contact for high performance application

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Chinese Physics B 2021年第11期30卷 495-500页

作者： Hai-Qing Xie Dan Wu Xiao-Qing Deng Zhi-Qiang Fan Wu-Xing Zhou Chang-Qing Xiang Yue-Yang Liu Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering School of Physics and Electronic ScienceChangsha University of Science and TechnologyChangsha 410114China School of Materials Science and Engineering&Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion Hunan University of Science and TechnologyXiangtan 411201China College of Information Science and Engineering Jishou UniversityJishou 416000China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

We preform a first-principles study of performance of 5 nm double-gated(DG)Schottky-barrier field effect transistors(SBFETs)based on two-dimensional SiC with monolayer or bilayer metallic 1T-phase MoS_(2) *** of the wide bandgap of SiC,the corresponding DG SBFETs can weaken the short channel *** calculated transfer characteristics also meet the standard of the high performance transistor summarized by international technology road-map for ***,the bilayer metallic 1T-phase MoS_(2) contacts in three stacking structures all can further raise the ON-state currents of DG SiC SBFETs in varying *** above results are helpful and instructive for design of short channel transistors in the future.

关键词： Schottky-barrier field effect transistor SiC band structure short channel effect

In Situ Induced Asymmetric Schottky Contacts Via Localized Ultrafast Laser Irradiation for Ultrasensitive, Self-Powered, 2d Photodetectors

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SSRN 2023年

作者： Peng, Jin Zou, Guisheng Huo, Jinpeng Xiao, Yu Sun, Tianming Li, Zehua Feng, Bin Liu, Lei Department of Mechanical Engineering State Key Laboratory of Tribology Key Laboratory for Advanced Manufacturing by Materials Processing Technology Ministry of Education of PR China Tsinghua University Beijing100084 China Taiyuan University of Technology Taiyuan030024 China

Self-powered photodetectors hold great promise for addressing power-related challenges in the "Internet of Things (IoT)"era. However, the self-powered performances of a metal-semiconductor-metal (MSM) structure photodetector are inherently limited due to the presence of the symmetric Schottky contacts, leading to canceling photocurrents in opposite directions, while constructing an asymmetric MSM structure demands complicated design or sustained external fields. Herein, we propose a novel in situ contact engineering strategy based on localized femtosecond (fs) laser irradiation, achieving an asymmetric band structure in an MSM-structure photodetector with pristine symmetric Schottky contacts. As a result, a MoS2 photodetector that exhibits exceptional photoresponse and self-powered performances is successfully fabricated. The device type transitions from a photoconductor to a photodetector, exhibiting a significant improvement in the rectification ratio from 1 to >104. A comprehensive study on fs laser-based contact engineering is conducted by investigating atom diffusion, element variation, and Schottky barrier height variation. Notably, the photodetector demonstrates an exceptional zero-bias responsivity of 1.72A/W, with a short circuit current of 37.2nA and maximum output electric power of 1.67nW. Our work provides a new strategy for modifying the energy band structure and facilitates the fabrication of high-performance self-powered photodetectors. © 2023, The Authors. All rights reserved.

关键词： Femtosecond lasers

From Nanorods to Nanoparticles: Morphological Engineering Enables Remarkable Hydrogen Storage by Lithium Borohydride

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SSRN 2024年

作者： Zhang, Wenxuan Zhou, Linming Zhang, Xin Zhang, Lingchao Lou, Zichen Guo, Baochun Hong, Zijian Gao, Mingxia Sun, Wenping Pan, Hongge Liu, Yongfeng State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China Zhejiang Key Laboratory of Advanced Solid State Energy Storage Technology and Applications Taizhou Institute Zhejiang University Taizhou318000 China Institute of Science and Technology for New Energy Xi’an Technological University Xi’an710021 China

Nanostructured LiBH4 with greatly improved de-/hydrogenation thermodynamics and kinetics has been attracting the ever-growing interest for on-board hydrogen storage applications. However, it is challenging to controllably fabricate various nanostructures of LiBH4 due to its strong reducibility, high chemical activity and sensitivity to water and oxygen. Here, we demonstrate the very first success in tailoring the nanoscaled LiBH4 morphology from nanorods to nanoparticles by using few-layer graphenes (FL-Grs) as supporters. The presence of 30 wt% FL-Grs is optimal because it contributes not only substantial nucleation sites for LiBH4 nanoparticles but also sufficient catalytic activity for hydrogen storage in LiBH4. The resultant LiBH4-30 wt% FL-Grs displays 20-50 nm-sized particles in morphology, which enables the complete reversible storage of 7.2 wt% H2 starting from 230 ºC for desorption and 190 ºC for absorption along with a highly stable cyclability, greatly superior to pristine sample and even the nano-LiBH4/FL-Grs mixture. The somewhat particle growth as well as the segregation and isolation of B and LiH with cycling is reasonably responsible for the gradually slowed desorption/absorption kinetics. This important insight guides the design and development of nanostrctured LiBH4-based composites featured high capacity and long life by combining nanometer size effect and catalytic effect. © 2024, The Authors. All rights reserved.

关键词： Nanoparticles