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Unlocking of Schottky Barrier Near the Junction of MoS_(2)Heterostructure Under Electrochemical Potential

Energy & Environmental materials 2025年第1期8卷 323-329页

作者： Kubra Aydin Mansu Kim Hyunho Seok Chulwoo Bae Jinhyoung Lee Muyoung Kim Jonghwan Park Joseph T.Hupp Dongmok Whang Hyeong-U Kim Taesung Kim SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan UniversitySuwon 16419Korea Department of Nano Science and Technology Sungkyunkwan UniversitySuwon 16419Korea Department of Chemistry Northwestern UniversityEvanstonIllinois 60208USA School of Advanced Material Science and Engineering Sungkyunkwan UniversitySuwon 16419Korea Semiconductor Manufacturing Research Center Korea Institute of Machinery and Materials(KIMM)Daejeon 34103Korea School of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Korea Center for Quantum Nanoscience Institute for Basic Science(IBS)Seoul 03760Korea 不详 Nano-Mechatronics University of Science&Technology(UST)Daejeon 34113Korea Department of Nano Engineering Sungkyunkwan UniversitySuwon 16419Korea

The exploration of heterostructures composed of two-dimensional(2D)transition metal dichalcogenide(TMDc)materials has garnered significant research attention due to the distinctive properties of each individual component and their phase-dependent unique *** the plasma-enhanced chemical vapor deposition(PECVD)method,we analyze the fabrication of heterostructures consisting of two phases of molybdenum disulfide(MoS_(2))in four different *** initial hydrogen evolution reaction(HER)polarization curve indicates that the activity of the heterostructure MoS_(2)is consistent with that of the underlying MoS_(2),rather than the surface activity of the upper MoS_(2).This behavior can be attributed to the presence of Schottky barriers,which include contact resistance,which significantly hampers the efficient charge transfer at junctions between the two different phases of MoS_(2)layers and is mediated by van der Waals ***,the energy barrier at the junction dissipates upon reaching a certain electrochemical potential,indicating surface activation from the top phase of MoS_(2)in the ***,the 1T/2H MoS_(2)heterostructure demonstrates enhanced electrochemical stability compared to its metastable 1T-MoS_(2).This fundamental understanding paves the way for the creation of phase-controllable heterostructures through an experimentally viable PECVD,offering significant promise for a wide range of applications.

关键词： hydrogen evolution reaction(HER) molybdenum disulfide(MoS_(2)) plasmaenhanced chemical vapor deposition(PECVD) Schottky barrier van der Waals(vdW)heterostructure

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Effect of Various Microstructures Obtained from Heat Treatment on Machinability Behavior of Ti-6Al-4V Alloy

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International Journal of engineering, Transactions A: Basics 2022年第1期35卷 184-190页

作者： Nohgani, M.T. Bayat, O. Moghadam, O. Mehrizi, V.A. Qazvin Iran Department of Material Science and Engineering Hamedan University of technology Hamedan Iran Department of Materials Engineering Karaj Branch Islamic Azad University Karaj Iran

Drilling test on cylindrical work-pieces was carried out to analysis the effect of various microstructures resulting from heat treatment on the machinability of the Ti-6Al-4V alloy. Chip morphology plays a predominant role in determining machinability and wearing of a tool during the drilling of titanium alloys. For this purpose, Ti-6Al-4V was heat treated in three variant cycles then drilled by 2mm diameter drill at 18.8 m/s speed and 0.1 mm/rev feed rate. Results show that heat treatment can affect on hardness. The SEM results showed that by changing their phase and morphology obtained from different heat treatment cycle, the machining conditions change. Increasing hardness led to increases length of spiral chips that indicate easy drilling. At a lower depth of cutting, ribbon chips are more compacted in comparison with samples which have a lower hardness. Drilling temperature was increased by increasing deep hole. Samples with lower hardness had a higher temperature in drilling. © 2022 materials and Energy Research Center. All rights reserved.

关键词： Aluminum alloys

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Synthesis of Improved Soft Magnetic Composites (SMCs) for Applications in Transformer Core 21

Synthesis of Improved Soft Magnetic Composites (SMCs) for Ap...

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21st International Bhurban Conference on Applied sciences and Technology, IBCAST 2024

作者： Usama, Muhammad Zahoor, Aqib Kusar, Asifa Mohsin, Amena Ali, Fahad Ul Haq Tariq, Naeem Nawaz Shahid, Hafiz Rub Waqas, Hassan Pakistan Institute of Engineering and Applied Sciences Nilore Department of Metallurgy and Material Engineering Islamabad Pakistan Pakistan Institute of Nuclear Science and Technology Nilore Materials Division Islamabad Pakistan

ISBN: (纸本)9798331516680

This study investigates the synthesis of Ni-Zn ferrite (Ni0.5Zn0.5Fe2O4) and Ni-Zn-Co ferrite (Ni0.3 Zn0.5Co0.2 Fe2 O4) cores via ball milling method for the transformers operating in the frequency range of 0.1 kHz to 100 kHz. Ni-Zn ferrite cores were synthesized using Fe2O3 and Fe3O4 as primary raw materials and Ni-Zn-Co ferrite was prepared using Fe2 O3 as raw material. The magnetic, structural and morphological properties were characterized using vibrating sample magnetometry (VSM), X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. Results demonstrated that the Ni0Zn0.5Fe2O4 ferrite core synthesized with Fe2O3 exhibits superior magnetic properties, maintaining stability across a frequency range of 0.1 kHz to 100 kHz and a temperature range of 10°C to 40°C. Both Ni-Zn ferrite and Ni-Zn-Co ferrite cores showed promising stability, making them suitable for high-frequency transformer applications. © 2024 IEEE.

关键词： Milling (machining)

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Effects of Current Mode and Electrodes on the Properties of Electroplated Fe-Ni Invar Alloy

Effects of Current Mode and Electrodes on the Properties of ...

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International Conference on Electronics Packaging (ICEP)

作者： N.Y. Kang J. H. Lee Material Science and Engineering Department Hongik University Republic of Korea

ISBN: (数字)9784991191190

ISBN: (纸本)9798331514747

Fe-Ni alloy was electroplated at various conditions, varying current mode and anode type to investigate the effects of them on the deposits. In pulse plating, Ni contents of deposits was lowered with increasing peak current. In addition, the compositional uniformity in deposits along with their thickness was increased compared to when using direct current due to anomalous property of Fe-Ni electroplating. On the other hand, the deposits with Ni anode (soluble anode) showed high Ni content than with DSA (inert anode) because of the concentration of $\text{Ni}^{2+}$ in the bath was increased as the Ni anode was dissolved during electroplating. The potential monitoring and $\text{pH}$ analysis of bath exhibited that oxidation of $\text{Fe}^{2+}$ to $\text{Fe}^{3+}$ was only occurred on DSA.

关键词： Electrochemical deposition Hands Electric potential Plating Nickel Oxidation Anodes Monitoring Electronics packaging Cathodes

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Effects of CeO_(2)Content on the Microstructure and Mechanical Properties of ZK60 Mg Alloy

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Acta Metallurgica Sinica(English Letters) 2025年第2期38卷 287-298页

作者： Wei Qiu Shuang-Long Li Zhao-Yuan Lu Sen-Mao Zhang Jian Chen Wei Chen Lang Gan Wei Li Yan-Jie Ren Jun Luo Mao-Hai Yao Wen Xie School of Energy and Power Engineering Changsha University of Science and TechnologyChangsha 410114China Key Laboratory of Energy Efficiency and Clean Utilization The Education Department of Hunan ProvinceChangsha University of Science and TechnologyChangsha 410114China School of Mechanical&Energy Engineering Zhejiang University of Science and TechnologyHangzhou 310023China Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104China Hunan Rare Earth Metal Material Research Institute Institute of Rare Earth Light AlloysChangsha 410126China

This study primarily investigates the effect of CeO_(2)content on the microstructure and mechanical properties of ZK60 Mg *** results indicate that CeO_(2)can be reduced by Mg to elemental Ce,predominantly in the form of the Mg-Zn-Ce *** addition of CeO_(2)notably refines the grain size of as-cast ZK60 Mg alloy,with the Mg-Zn-Ce phase primarily distributed along grain *** extrusion,grain size increases and then decreases with increasing CeO_(2)content,while the dynamic recrystallization(DRX)fraction gradually *** behavior is chiefly attributed to the hindrance of the DRX process by a high density of second phases and the restriction of recrystallized grains growth by fine *** basal texture intensity increases progressively with the addition of CeO_(2).As the CeO_(2)content rises,the yield strength(YS)and elongation(EL)of the alloys show significant *** increase in YS is mainly due to the combined effects of grain refinement strengthening and dispersion *** contrast,the enhanced EL is closely related to the heterogeneous structure of the ***,the ZK60-1.2CeO_(2)alloy exhibits the ultimate tensile strength,YS and EL of 274 MPa,160 MPa and 17.3%,respectively.

关键词： Magnesium alloy Rare earth oxides Microstructure Mechanical property

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A cross-scale characterization of porous rocks altered by flow and dissolution 58

A cross-scale characterization of porous rocks altered by fl...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Xu, Z. Li, W. Kolanti, A. Sprouster, D. Department of Civil Engineering Stony Brook University Stony BrookNY United States Department of Material Science and Chemical Engineering Stony Brook University Stony BrookNY United States

ISBN: (纸本)9798331305086

Flow and dissolution induce wormholes in porous rocks, which lead to a substantial increase in both permeability and flow heterogeneity of the rock formation. Wormholes originate from the initial micron-scale pore networks, and gradually transition to more prominent millimeter-scale holes. Wormholes have a crucial impact on the flow and reactions in subsurface technologies, such as critical mineral leaching, CO2 storage and reservoir stimulation. Understanding how wormholes form from pore networks is crucial for the effectiveness of these subsurface technologies. However, current studies are limited to two separate scales of characterizations: millimeter-scale wormholes and micron-scale pore networks. The transitional region, which bridges these features at the two scales, remains largely unexplored and inadequately characterized. This knowledge gap obscures our understanding of the underpinning physics that governs wormhole formation in porous rocks. In this study, we aim to bridge these two scales of study with multiscale characterization. We create wormholes in porous gypsum specimens through core flood tests. The wormholes are then scanned with low-resolution (26.70 µm) and high-resolution (3.43 µm) X-ray computed tomography (CT). We quantitatively characterize the geometry of the wormholes leading to pore networks regarding their diameters, and quantities. This 3D cross-scale characterization allows for an accurate depiction of the interactions between wormholes and pore networks and provides physical insights into the initiation of wormholes. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Rock mechanics

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Constitutive model of viscoelastic dynamic damage for the material of gas obturator in modular-charge howitzer

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Defence Technology（防务技术） 2024年第9期39卷 203-216页

作者： Zhonggang Li Longmiao Chen Yifan Li Yufeng Jia Quan Zhang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China Technology Center Shanxi North Machine-building Co.Ltd.Taiyuan 030009China Research and Development Department Kelong New Material Technology Co.Ltd.Xianyang 712000China

In order to investigate the mechanical response behavior of the gas obturator of the breech mechanism,made of polychloroprene rubber(PCR), uniaxial compression experiments were carried out by using a universal testing machine and a split Hopkinson pressure bar(SHPB), obtaining stress-strain responses at different temperatures and strain rates. The results revealed that, in comparison to other polymers, the gas obturator material exhibited inconspicuous strain softening and hardening effects;meanwhile, the mechanical response was more affected by the strain rate than by temperature. Subsequently, a succinct viscoelastic damage constitutive model was developed based on the ZWT model, including ten undetermined parameters, formulated with incorporating three parallel components to capture the viscoelastic response at high strain rate and further enhanced by integrating a three-parameter Weibull function to describe the damage. Compared to the ZWT model, the modified model could effectively describe the mechanical response behavior of the gas obturator material at high strain rates. This research laid a theoretical foundation for further investigation into the influence of chamber sealing issues on artillery firing.

关键词： Breech mechanism Gas obturator Polychloroprene rubber Constitutive model Strain rate Damage

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Mechanically robust antifouling coating with dual-functional antifouling strategy by infiltrating PDMS into plasma-sprayed porous Al_(2)O_(3)-Cu coating

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Journal of materials science & Technology 2023年第28期159卷 125-137页

作者： Shuaiqiang Bi Kangwei Xu Guosheng Shao Ke Yang Jiajia Tian State Centre for International Cooperation on Designer Low-Carbon and Environmental Material(SCICDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou450001China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou450001China Special Functional Materials Department Luoyang Ship Material Research InstituteLuoyang471023China Institute of Metal Research Chinese Academy of SciencesShenyang110016China

Marine biofouling is a worldwide challenge that needs to be solved ***(dimethylsiloxane)(PDMS)-based fouling release coatings with low surface free energy(SFE)could effectively inhibit ***,their poor mechanical durability,adhesive strength,and antifouling performance under static conditions significantly limit their ***,a novel mechanically robust Al_(2)O_(3)-PDMS-Cu composite coating with strong adhesive strength and remarkable antifouling performance was *** Al_(2)O_(3)-PDMS-Cu coating loaded with a small amount of Cu was fabricated by infiltrating PDMS into plasma-sprayed micro/nano-scaled porous Al_(2)O_(3)-Cu *** showed that the fabri-cation of this Al_(2)O_(3)-PDMS-Cu coating did not alter the surface hydrophobicity and SFE of PDMS signif-icantly,thus presenting little influence on its inherent fouling release *** rigorous abrasion test,the Al_(2)O_(3)-PDMS-Cu coating presented remarkably improved surface hydrophobicity due to the ex-posure of micro/nano structure,rather than falling offas that of PDMS *** combination of excel-lent abrasion resistance and one order of magnitude higher adhesive strength and hardness than PDMS coating contributed to the outstanding mechanical robustness of Al_(2)O_(3)-PDMS-Cu ***,the antifouling assays against marine bacteria adhesion(95%reduction rate for Escherichia coli.(***))and algae attachment(96%and 94%reduction rates for Chlorella and Phaeodactylum tricornutum(***-nutum),respectively after 21 days of incubation)demonstrated the superior antifouling performance of the Al_(2)O_(3)-PDMS-Cu ***,a high-performance Al_(2)O_(3)-PDMS-Cu antifouling coating with excellent mechanical robustness and long-term antifouling performance was achieved via the combination of me-chanical durability of Al_(2)O_(3)skeleton and the dual-functional antifouling strategy,i.e.,the fouling release property of PDMS and fouling r

关键词： Marine antifouling Al_(2)O_(3)-PDMS-Cu composite coating Plasma spraying Mechanical robustness Dual-functional strategy Long-lasting antifouling

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Investigation of the Thermal and Mechanical Properties of Hydrolyzed-Collagen-Reinforced Poly(lactic acid) Composite Blown Films

ACS Sustainable Resource Management

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ACS Sustainable Resource Management 2024年第1期2卷 62-71页

作者： Radhika Panickar Vijay K. Rangari Department of Material Science and Engineering Tuskegee University Tuskegee Alabama 36088 United States

Poly(lactic acid) (PLA) is a biodegradable polyester polymer that is a promising material for replacing petroleum-based polymers in various applications. The present study investigates the mechanical and thermal properties of hydrolyzed collagen (HC) powder-reinforced biopolymer composite blown films. The biodegradable polymer PLA was reinforced with HC at different weight percentages (0.5%, 0.75%, 1%, and 1.25%) using the solution blending method in chloroform, followed by blown-film extrusion. Among different weight percentages of HC in the PLA matrix, 1 wt % HC reinforced with PLA blown films exhibited significant changes and improvements in the FTIR, XRD, TGA, and DSC analyses. A polymer blend formation from PLA and 1% HC was observed in XRD, FTIR, and Raman analyses, exhibiting chemical bonding of the amide group to the PLA backbone. It was understood that intermolecular interaction of the PLA and HC molecules was due to the inter-H bonds of the −NH, −OH, and −CH functional groups. The thermal behavior and crystallinity of the PLA/HC composite films were investigated using TGA and DSC. Compared with other film samples, PLA/1% HC exhibited a higher thermal stability of 360.29 °C. The tensile studies show significant enhancement in the flexibility with a high elongation strength of PLA/HC composite films compared to neat PLA films. The fracture analysis of PLA/1% HC confirms the interfacial compatibility and transformation to plastic deformation due to the chemical bonding of HC in the PLA matrix. The PLA/HC composite films exhibit UV barrier properties that are recommended for food packing applications.

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Improving the Accuracy of Animal Species Classification in Camera Trap Images Using Transfer Learning

Improving the Accuracy of Animal Species Classification in C...

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2024 International Conference on Artificial Intelligence, Computer, Data sciences, and Applications, ACDSA 2024

作者： Boukar, Moussa Mahamat Mahamat, Assia Aboubakar Djibrine, Oumar Hassan Abubakar, Usman Bello Nile University of Nigeria Department of Computer Science Abuja Nigeria Université Virtuelle du Tchad Department of Computer Science Abuja Nigeria African University of Science and Technology Department of Material Science & Engineering Abuja Nigeria Université Virtuelle du Tchad Department of Computer Science N'Djamena Chad Baze University Department of Computer Science Abuja Nigeria

ISBN: (纸本)9798350394528

Understanding biodiversity, monitoring endangered species, and estimating the possible effect of climate change on particular regions all rely on animal species identification. Closed-circuit television (CCTV) cameras, which can collect huge volumes of video data, are an excellent environmental monitoring tool. However, manually evaluating these massive datasets is time-consuming, difficult, and expensive, emphasizing the need for automated ecological *** learning models have transformed computer vision, handling problems such as object and species detection. Their cutting-edge performance qualifies them for this application. The purpose of this work was to create and test machine learning models for distinguishing diverse animal species using camera trap images. On VGG19, GoogLeNet (InceptionV3), ResNet50, and DenseNet121, we used transfer learning. The best multi-classification accuracy was attained by GoogLeNet (87%), followed by ResNet50 (83%), DenseNet (81%), and VGG19 (53%). This evidence suggests that transfer learning outperforms training models from scratch for this task. © 2024 IEEE.

关键词： Image classification

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