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A monolithically sculpted van der Waals nano-opto-electro-mechanical coupler

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Light(Science & Applications) 2022年第3期11卷 76-85页

作者： Tongyao Zhang Hanwen Wang Xiuxin Xia Ning Yan Xuanzhe Sha Jinqiang Huang Kenji Watanabe Takashi Taniguchi Mengjian Zhu Lei Wang Jiantou Gao Xilong Liang Chengbing Qin Liantuan Xiao Dongming Sun Jing Zhang Zheng Han Xiaoxi Li State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of extreme Optics Shanxi UniversityTaiyuan 030006China Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Material Science and Engineering University of Science and Technology of ChinaAnhui 230026China Research Center for Functional materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China The Key Laboratory of Science and Technology on Silicon Devices Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China The University of Chinese Academy of Sciences Beijing 100029China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China

The nano-opto-electro-mechanical systems(NOEMS)are a class of hybrid solid devices that hold promises in both classical and quantum manipulations of the interplay between one or more degrees of freedom in optical,electrical and mechanical *** date,studies of NOEMS using van der Waals(vdW)heterostructures are very limited,although vdW materials are known for emerging phenomena such as spin,valley,and topological ***,we devise a universal method to easily and robustly fabricate vdW heterostructures into an architecture that hosts opto-electro-mechanical couplings in one single *** demonstrated several functionalities,including nano-mechanical resonator,vacuum channel diodes,and ultrafast thermo-radiator,using monolithically sculpted graphene NOEMS as a *** readout of electric and magnetic field tuning of mechanical resonance in a CrOCl/graphene vdW NOEMS is further *** results suggest that the introduction of the vdW heterostructure into the NOEMS family will be of particular potential for the development of novel lab-on-a-chip systems.

关键词： monolithic tuning resonator

Thermionic electron emission in the 1D edge-to-edge limit

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Chinese Physics B 2022年第5期31卷 733-737页

作者： Tongyao Zhang Hanwen Wang Xiuxin Xia Chengbing Qin Xiaoxi Li State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of extreme Optics Shanxi UniversityTaiyuan 030006China Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China

Thermionic emission is a tunneling phenomenon,which depicts that electrons on the surface of a conductor can be pulled out into the vacuum when they are subjected to high electrical tensions while being heated hot enough to overtake their work *** principle has led to the great success of the so-called vacuum tubes in the early 20 th *** date,major challenges still remain in the miniaturization of a vacuum channel transistor for on-chip integration in modern solid-state integrated ***,by introducing nano-sized vacuum gaps(~200 nm)in a van der Waals heterostructure,we successfully fabricated a one-dimensional(1 D)edge-to-edge thermionic emission vacuum tube using graphene as the *** the increasing collector voltage,the emitted current exhibits a typical rectifying behavior,with the maximum emission current reaching 200 p A and an ON-OFF ratio of 10;.In addition,it is found that the maximum emission current is proportional to the number of the layers of *** results expand the research of nano-sized vacuum tubes to an unexplored physical limit of 1 D edge-to-edge emission,and hold great promise for future nano-electronic systems based on it.

关键词： vacuum microelectronics thermionic emission graphene electronic transport in nanoscale materials and structures

Elimination of extraordinarily high cracking susceptibility of aluminum alloy fabricated by laser powder bed fusion

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Journal of materials Science & Technology 2022年第8期103卷 50-58页

作者： Holden Hyer Le Zhou Sharon Park Thinh Huynh Abhishek Mehta Saket Thapliyal Rajiv S.Mishra Yongho Sohn Department of materials Science and Engineering University of Central FloridaOrlandoFLUSA Center for Friction Stir Processing Department of Materials Science and EngineeringAdvanced Materials and Manufacturing Processes InstituteUniversity of North TexasDentonTXUSA Now Research Scientist Oak Ridge National LaboratoryOak RidgeTNUSA Now Assistant Professor Marquette UniversityMilwaukeeWIUSA Now PhD Candidate Johns Hopkins UniversityBaltimoreMDUSA

Using the calculation of phase diagrams approach and Scheil solidification modeling,the Al-2.5Mg-1.0Ni-0.4Sc-0.1Zr alloy was designed,intentionally with an extraordinarily high cracking susceptibility,making it prime for solidification cracking during laser powder bed *** study demonstrates the ability to mitigate even the most extreme solidification cracking tendencies in aluminum alloys with only minor alloying additions of Sc and Zr,0.5 wt.%***,by employing a simple direct ageing heat treatment,good tensile mechanical properties were observed with a yield strength of 308 MPa,an ultimate tensile strength of 390 MPa,and a total elongation of 11%.

关键词： Additive manufacturing Cracking susceptibility Aluminum alloy CALPHAD Mechanical properties

Synthesis of Polycrystalline Diamond Compact with Selenium:Discovery of a New Se–C Compound

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Chinese Physics Letters 2020年第5期37卷 102-105页

作者： Wen-Dan Wang Ao Li Guo-Heng Xu Pei Wang Yue-Gao Liu Li-Ping Wang School of Physical Science and Technology Southwest Jiaotong UniversitChengdu 610031 materials Research Center Institute of Modern PhysicsChinese Acadermy of SciencesLanzhou 730000 Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology(SUSTech)Shenzhen 518055 CAS Key Laboratory for Experimental Study under Deep-Sea extreme Conditions Institute of Deep-Sea Science and EngineeringChinese Academy of SciencesSanya 572000

Sintering of polycrystalline diamond with selenium was investigated under pressure of 6.5-10.5 GPa at a constant temperature of 1850℃.A new carbon-selenium compound with a most plausible chemical formula of SeC and a WC-type hexagonal structure(space group P6m2)has been discovered in the recovered samples sintered at 10.5 GPa and 1850℃.Refined lattice parameters are as follows:a=2.9277(4)A,c=2.8620(4)A,V=21.245(4)A^*** diamond compacts hot-pressed at 10.5 GPa have excellent mechanical properties with a Vickers hardness of about 68 GPa at a loading force of 19.6 *** intergrowths observed in these samples may have benefited from the catalytic effects of Se/SeC on the nucleation and crystal growth of diamond.

关键词： Diamond hexagonal Vickers

Numerical modeling of SiC by low-pressure chemical vapor deposition from methyltrichlorosilane

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1733-1743页

作者： Kang Guan Yong Gao Qingfeng Zeng Xingang Luan Yi Zhang Laifei Cheng Jianqing Wu Zhenya Lu School of materials Science and Engineering South China University of TechnologyGuangzhou 510640China Science and Technology on Thermostructural Composite materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China MSEA International institute for materials Genome Gu'an 065500China

The development of functional relationships between the observed deposition rate and the experimental conditions is an important step toward understanding and optimizing low-pressure chemical vapor deposition(LPCVD)or low-pressure chemical vapor infiltration(LPCVI).In the field of ceramic matrix composites(CMCs),methyltrichlorosilane(CH3 SiCl3,MTS)is the most widely used source gas system for SiC,because stoichiometric SiC deposit can be facilitated at 900°C–1300°***,the reliability and accuracy of existing numerical models for these processing conditions are rarely *** this study,a comprehensive transport model was coupled with gas-phase and surface *** resulting gas-phase kinetics was confirmed via the measured concentration of gaseous *** relationship between deposition rate and 24 gaseous species has been effectively evaluated by combining the special superiority of the novel extreme machine learning method and the conventional sticking coefficient *** kinetics were then proposed and shown to reproduce the experimental *** proposed simulation strategy can be used for different material systems.

关键词： Chemical vapor deposition MTS/H2 Gas-phase and surface kinetics extreme learning machine method Numerical model

Hard-core Hall tube in superconducting circuits

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Chinese Physics B 2022年第8期31卷 226-233页

作者： Xin Guan Gang Chen Jing Pan Zhi-Guo Gui Department of materials and Chemical Engineering Taiyuan UniversityTaiyuan 030032China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of extreme Optics Shanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

The Hall tube as a minimum model to simulate the integer quantum Hall effect is essential for exploring topological physics, while it has not been constructed in the recent developing successfully experiments on superconducting *** this work, we propose a feasible experiment scheme using three legs superconducting circuits with transmon qubits to realize a Hall tube. Then we first investigate its topological properties. Since the time–reversal, particle–hole, and chiral symmetries are all broken for the system, the Hall tube belongs to the A class of the Altland–Zirnbauer *** obtain the corresponding topological phase transition both numerically and analytically. Since the chirality is a key character of the quantum Hall effect, we secondly investigate the chiral physics in the Hall tube. We find the topological protected chiral edge currents and discuss its robustness. Finally, we give the possible experimental observations of the topological state and topological protected chiral edge currents.

关键词： Hall tube superconducting circuits topological phase transition chiral edge currents

Ultrasonic Properties of the MgB_(2) Superconductor

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Chinese Physics Letters 2001年第10期18卷 1369-1370页

作者： LI Shao-Chun WANG Ru-Ju LI Feng-Ying LIU Zhen-Xing ZHU Jia-Lin YU Ri-cheng JIN Chang-Qing Laboratory for extreme Condition Physics Institute of Physicsand Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080 Beijing Center for High Pressure Research Chinese Academy of SciencesBeijing 100080

The sound velocities of longitudinal and shear waves are measured on a polycrystalline MgB_(2) superconductor with Tc of 39 K. The specimen used in the experiments is pressed and heated using the MgB_(2) powder. The elastic moduli, Debye temperature and specific heat at room temperature are obtained based on sound velocity data. The results indicate that the velocities are much higher than those in the usual materials, while elastic constants remain reasonably soft, which may be due to the high transition temperature of the MgB2 superconductor.

关键词： heated Superconductor superconductor

3D Nanoporous Graphene Based Single-Atom Electrocatalysts for Energy Conversion and Storage

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Accounts of materials Research 2022年第10期3卷 1011-1021页

作者： Isaac Johnson Jiuhui Han Mingwei Chen Department of materials Science and Engineering Johns Hopkins UniversityBaltimoreMaryland 21218United States WPI Advanced institute for materials Research Tohoku UniversitySendai 980-8577Japan Frontier Research institute for Interdisciplinary Sciences(FRIS) Tohoku UniversitySendai 980-8578Japan

CONSPECTUS:This Account will provide an overview and analysis on recent research of 3D nanoporous graphene based single-atom electrocatalysts for energy conversion and storage *** order to meet the increasing energy demands and assist in the transition from a global economy that relies heavily on fossil fuels to one that utilizes more renewable energy sources,there is urgent need to develop highperforming electrocatalysts toward renewable energy related *** catalysts are expected to have low overpotentials,high reaction selectivity,long cycling stability,and,importantly,lower materials costs to address the challenges of traditional nanoparticulate noble metal catalysts.

关键词： utilize selectivity stability

Efficient prediction of corrosion behavior in ternary Ni-based alloy systems:Theoretical calculations and experimental verification

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Journal of materials Science & Technology 2023年第36期167卷 94-106页

作者： Xuelian Xiao Keke Chang Kai Xu Ming Lou Liping Wang Qunji Xue Key Laboratory of Marine materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Pourbaix diagrams are calculated to describe electrochemical processes for alloys in aqueous *** the multi-component differentiation of alloy systems,the construction of Pourbaix diagrams is fac-ing challenges,especially for non-single-phase alloy *** this study,the simultaneous construction of phase diagrams and Pourbaix diagrams were implemented for predicting the evolution of the phases in the immune and passive *** CALPHAD(CALculation of PHAse Diagram)approach was used to quickly access the Gibbs free energies of various phases and the chemical potential of the elements in the phases from the thermodynamic database of the Ni-Si-Al-Y *** corrosion behavior of two typical Ni-Al-Si and Ni-Al-Y systems was *** and Y were added to Ni-based alloys to produce the solid solutions L12-Ni_(3)(Al,Si)and L12-Ni_(3)Al+Ni_(5)Y,*** showed that NiO and Al_(2)O_(3)make up the passive area of the Ni_(3)Al 1 *** introduction of SiO_(2)and Y(OH)3 in the passive region separately helped to minimize the alloys’susceptibility to ***,Si reduced the thermody-namical possibility of NiO for mation in the passive film,and the addition of Y caused extreme galvanic *** on Ni-based alloys validated the results through electrochemical *** was also discovered that the presence of Ni_(5)Y produced galvanic corrosion and that Si reduced the oxide in the passive film,causing pitting *** corrosion prediction of the quaternary alloys indicates that the solid solution of Si in Ni_(5)Y reduces the galvanic corrosion effect and the dissolution of passive *** current work demonstrates that phase diagrams and Pourbaix diagrams may be efficiently and accurately predicted using a well-constructed thermodynamic database,which has major implications for future studies on the corrosion behavior of multi-component alloys.

关键词： Pourbaix diagrams CALPHAD Ni-based alloys Passive film