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Electronic properties of 2D materials and their junctions

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Nano materials Science 2024年第1期6卷 1-23页

作者： Taposhree Dutta Neha Yadav Yongling Wu Gary J.Cheng Xiu Liang Seeram Ramakrishna Aoussaj Sbai Rajeev Gupta Aniruddha Mondal Zheng Hongyu Ashish Yadav Department of Chemistry Indian Institute of Engineering Science and TechnologyShibpurWest Bengal711103India Center for Advanced Laser Manufacturing(CALM) Shandong University of TechnologyZibo255000PR China school of Industrial Engineering Purdue University315 N.Grant St.West LafayetteIN47907United States Birck Nanotechnology Center Purdue University1205 W State St.West LafayetteIN47907United States Advanced materials Institute Qilu University of TechnologyShandong Academy of SciencesJinan250014PR China Nanoscience and Nanotechnology Initiative National University of Singapore10 Kent Ridge Crescent119260Singapore Faculty of Applied Phsyics and Mathematics Gdansk University of Technology Narutowicza 11/1280233GdanskPoland Department of Physics School of EngineeringUniversity of Petroleum&Energy StudiesDehradun248007UttarakhandIndia Department of Physics National Institute of Technology DurgapurDurgapur713209West BengalIndia

With an extensive range of distinctive features at nano meter-scale thicknesses,two-dimensional(2D)materials drawn the attention of the scientific *** tremendous advancements in exploratory research on 2D materials,knowledge of 2D electrical transport and carrier dynamics still in its ***,here we highlighted the electrical characteristics of 2D materials with electronic band structure,electronic transport,dielectric constant,carriers *** atomic thinness of 2D materials makes substantially scaled field-effect transistors(FETs)with reduced short-channel effects conceivable,even though strong carrier mobility required for high performance,low-voltage device *** also discussed here about factors affecting 2D materials which easily enhanced the activity of those materials for various ***,Those 2D materials used in state-of-the-art electrical and optoelectronic devices because of the extensive nature of their electronic band structure.2D materials offer unprecedented freedom for the design of novel p-n junction device topologies in contrast to conventional bulk *** also,describe the numerous 2D p-n junctions,such as homo junction and hetero junction including mixed dimensional ***,we talked about the problems and potential for the future.

关键词： 2D materials Electrical properties p-n junctions Mixed hereto junctions Homo junctions Electrical transport

Effects of electrolyte components on properties of Al alloy anode

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中国有色金属学会会刊：英文版 2009年第1期19卷 160-165页

作者：马正青左列庞旭曾苏民 school of materials Science and Engineering Central South University

The effects of Na2SnO3, In(OH)3 and Na2SnO3+In(OH)3 on the properties of Al alloy anode were studied in alkaline medium at 25 ℃. The self-corrosion rate of Al alloy anode was studied by method of H2 immersed in aqueous medium, and the electrochemical properties of Al alloy anode were tested via galvanostatic discharge and dynamic potential methods. The results show that the self-corrosion rate of Al alloy anode in 4 mol/L NaOH+3 mol/L NaAlO2 medium can be minimized by adding Na2SnO3, In(OH)3 and Na2SnO3+ In(OH)3. Na2SnO3, In(OH)3 and Na2SnO3+In(OH)3 make Al anodic potential shift positively in galvanostatic discharging. The most effective additive of Al alloy anode in 4 mol/L NaOH+3 mol/L NaAlO2 medium is 0.075 mol/L Na2SnO3+0.005 mol/L In(OH)3, integrating self-corrosion rate and electrochemical properties.

关键词：铝合金热处理缓蚀剂金属学

Effect of minor Sc and Zr addition on microstructures and mechanical properties of Al-Zn-Mg-Cu alloys

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中国有色金属学会会刊：英文版 2007年第2期17卷 340-345页

作者：邹亮潘清林何运斌王昌臻梁文杰 school of materials Science and Engineering Central South University

Three kinds of Al-Zn-Mg-Cu based alloys with 0.22%, 0.36%(Sc+Zr) (mass fraction, %), and without Sc, Zr addition were prepared by ingot metallurgy. By using optical microscopy, transmission electronic microscopy and scanning electron microscopy, the effects of microalloying elements of Sc, Zr on the microstructure of super-high-strength Al-Zn-Mg-Cu alloys related to mechanical properties were investigated. The tensile properties and microstructures of the studied alloys under different heat treatment conditions were studied. The addition of minor Sc, Zr results in the formation of Al3(Sc,Zr) particles. These particles are highly effective in refining the microstructures, retarding recrystallization, pinning dislocations and subboundaries. The strength of Al-Zn-Mg-Cu alloys was greatly improved by simultaneously adding minor Sc, Zr, meanwhile the ductility of the studied alloys remains at a higher level. The 0.36%(Sc+Zr) alloys gain the optimal properties after 465 ℃/h solution and 120 ℃/24 h aging. The increment of strength is mainly due to strengthening of fine grain and substructure and precipitation of Al3(Sc, Zr) particles.

关键词： Al-Zn-Mg-Cu合金次要添加剂钪锆显微结构机械性能

Effects of zonal heat treatment on residual stresses and mechanical properties of electron beam welded TC4 alloy plates

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中国有色金属学会会刊：英文版 2009年第2期19卷 324-329页

作者：胡美娟刘金合 school of materials Science and Engineering Northwestern Polytechnical University

Zonal heat treatment(ZHT) was conducted in situ to 14.5 mm-thick TC4 alloy plates by means of defocused electron beam after welding. The effects of ZHT on residual stresses,microstructures and mechanical properties of electron beam welded joints were investigated. Experimental results show residual stresses after welding are mostly relieved through ZHT,and the maximum values of longitudinal tensile stress and transverse compressive stress reduce by 76% and 65%,respectively. The tensile strength and ductility of welded joint after ZHT at slow scanning velocity are improved because of the reduction of residual stress and the microstructural changes of the base and weld metal. ZHT at fast scanning velocity is detrimental to the ductility of welded joint,which is resulted from insufficiently coarsened alpha phase in the fusion zone and the appearance of martensite in the base metal.

关键词：电子束焊接残余应力力学性能应力和 TC4 热处理金板纬向

Microstructure Evolution of in situ (Ti3AlC+Ti5Si3 )/Ti3Al Composite Sheet with a Novel Quasi-continuous Chain Reinforcement Distribution Architecture Prepared by Using Roll Bonding and Reaction Annealing

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Journal of materials Science & Technology 2013年第12期29卷 1191-1196页

作者： J.C.Pang G.H.Fan X.P.Cui A.B.Li L.Geng Z.Z.Zheng Q.W.Wang school of materials Science and Engineering Harbin Institute of Technology

The Ti3Al matrix composite sheet with a novel quasi-continuous chain reinforcement distribution was prepared by using roll bonding and subsequent reaction annealing with pure Ti and SiCp/Al *** (Ti3AlC t Ti5Si3) reinforcements were produced by in situ reaction of the as-rolled Tie(SiC p/Al) laminated composite sheet after a two-stage annealing treatment including first annealing at 660 C and second annealing at 1250 *** microstructure evolution during the reaction annealing was *** the first reaction annealing,TiAl3was formed,and the SiC particles were pushed together due to the Kirkendall effect,and after the second reaction annealing,Ti3Al,Ti3AlC and Ti5Si3were *** addition,the reinforcement distribution presents a quasi-continuous chain microstructure in Ti3Al matrix composite sheet.

关键词： Composite Intermetallic Fabrication Reaction synthesis

Fabrication and thermal decomposition of glycidyl azide polymer modified nitrocellulose double base propellants

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Science China Chemistry 2016年第4期59卷 472-477页

作者： Benbo Zhao Tianfu Zhang Zhen Ge Yunjun Luo school of materials Science and Engineering Beijing Institute of Technology

Glycidyl azide polymer （GAP） with the advantages of non-volatility and excellent thermal stability is a candidate as a re- placement for nitroglycerine （NG） in a double base propellant. The GAP-NC double base propellants were formulated with GAP and nitrocellulose （NC） fibers. Tensile test and SEM characterization indicated that GAP-NC propellants had a homoge- neous structure. Thermogravimetric analysis of GAP-NC propellants revealed that the onset decomposition temperature reached a high level ranging from 192.9 to 194.6 ℃, which indicated that the substitution of NG with GAP contributed to the safe storage and process operations for double base propellant. The result analysis of decomposition products of GAP-NC propellants showed that the main gas decomposition products of the propellants were NO, NO〉 CO, CO2, NH3, CH4, HCN, N2 CH20 and C2H40. The thermal decomposition process of the specimens was proposed.

关键词： glycidyl azide polymers (GAP) nitrocellulose double base propellant nitroglycerine thermal decomposition

Understanding the oxidation chemistry of Ti_(3)C_(2)T_(x)(MXene)sheets and their catalytic performances

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Journal of Energy Chemistry 2024年第1期88卷 437-445,I0010页

作者： Suvdanchimeg Sunderiya Selengesuren Suragtkhuu Solongo Purevdorj Tumentsereg Ochirkhuyag Munkhjargal Bat-Erdene Purevlkham Myagmarsereejid Ashley DSlattery Abdulaziz SRBati Joseph GShapter Dorj Odkhuu Sarangerel Davaasambuu Munkhbayar Batmunkh Department of Chemistry Division of Natural SciencesSchool of Arts and SciencesNational University of MongoliaUlaanbaatar 14200Mongolia Queensland Micro-and Nanotechnology Centre School of Environment and ScienceGriffith UniversityNathan campusBrisbaneQueensland 4111Australia Department of Physics Incheon National UniversityIncheon 22012Republic of Korea Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaBrisbaneQueensland 4072Australia Adelaide Microscopy The University of AdelaideAdelaideSouth Australia 5005Australia Centre for Organic Photonics&Electronics School of Chemistry and Molecular BiosciencesThe University of QueenslandSt LuciaBrisbaneQueensland 4072Australia

Transition metal carbides and nitrides(MXenes)nanosheets are attractive two-dimensional(2D)materials,but they suffer from oxidation/degradation issues during storage and/or applications due to their sensitivity to water and *** the great research progress,the exact oxidation kinetics of Ti_(3)C_(2)T_(x)(MXene)and their final products after oxidation are not fully ***,we systematically tracked the oxidation process of few-layer Ti_(3)C_(2)T_(x) nanosheets in an aqueous solution at room temperature over several *** also studied the oxidation effects on the electrocatalytic properties of Ti_(3)C_(2)T_(x) for hydrogen evolution reaction and found that the overpotential to achieve a current density of 10 mA cm^(-2)increases from 0.435 to 0.877 V after three weeks of degradation,followed by improvement to stabilized values of around 0.40 V after eight *** results suggest that severely oxidized MXene could be a promising candidate for designing efficient *** to our detailed experimental characterization and theoretical calculations,unlike previous studies,black titanium oxide is formed as the final product in addition to white Ti(IV)oxide and disordered carbons after the complete oxidation of Ti_(3)C_(2)T_(x).This work presents significant advancements in better understanding of 2D Ti_(3)C_(2)T_(x)(MXene)oxidation and enhances the prospects of this material for various applications.

关键词： 2D materials MXene Chemical degradation Catalysis Hydrogen evolution reaction

Ceria-based catalysts for soot oxidation: a review

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Journal of Rare Earths 2015年第6期33卷 567-590页

作者：刘爽吴晓东翁端冉锐 The Key Laboratory of Advanced materials of Ministry of Education School of Materials Science and Engineering Tsinghua University State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University

Developments in ceria-based soot oxidation catalysts, especially during the last decade, are reviewed. Based on the com- parisons of the activity, durability and cost-efficiency of different soot oxidation catalysts, four kinds of applicable ceria-based cata- lysts have been screened out, which are：（1） CexZrl-xO2 catalyst with high cerium content （x〉0.76）, （2） rare-earth metals （especially Pr） modified ceria, （3） transition metals （especially Mn and Cu） modified ceria, and （4） Ag/CeO2. Moreover, a general review of recent developments on the morphology-controlled ceria-based catalysts, as well as that on the soot oxidation mechanisms over different ceria-based catalysts, is also presented.

关键词： soot oxidation ceria material modification morphology reaction mechanism durability rare earths

Effects of precipitates on grain size and mechanical properties of AZ31-x% Nd magnesium alloy

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Journal of Rare Earths 2014年第5期32卷 451-457页

作者：张爱民郝海刘晓滕张兴国 school of materials Science and Engineering Dalian University of Technology

The effects of precipitates on grain size and mechanical properties of as-cast AZ3 1-x%Nd magnesium alloy were investi- gated, and the affecting mechanism was also discussed. The results indicated that Al2Nd phase, AlllNd3 phase and a few AI-Mn-Nd-Fe phase were furmed when adding 0.38 wt.%-1.46 wt.% Nd into AZ31 melt, coarse AI2Nd transformed into Al11Nd3 gradually with the increasing of Nd content. Due to structure and size transformation and content increasing of AI-Nd phase, the grain size of AZ31-x% Nd alloy increased firstly, and then decreased with the increment of Nd content. After reaching a minimum value, once again it rose up, provided that Nd content was further increased. The tensile property reached its optimal value when the adding amount of Nd content was 1.05 wl.%, however, adding excessive amount of Nd deteriorated both ultimate strength and elongation ofAZ31 alloy.

关键词： AZ31 magnesium alloy Nd microstructure mechanical properties rare earths