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Investigation of reflection anisotropy induced by micropipe defects on the surface of a 4H-SiC single crystal using scanning anisotropy microscopy

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Chinese Physics B 2024年第3期33卷 630-637页

作者：黄威俞金玲刘雨彭燕王利军梁平陈堂胜徐现刚刘峰奇陈涌海 Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China National Key Laboratory of Solid-state Microwave Devices and Circuits Nanjing Electronic Devices InstituteNanjing 210016China Institute of Micro/Nano Devices and Solar Cells School of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Optical reflection anisotropy microscopy mappings of micropipe defects on the surface of a 4H-SiC single crystal are studied by the scanning anisotropy microscopy(SAM)*** reflection anisotropy(RA)image with a'butterfly pattern'is obtained around the micropipes by *** RA image of the edge dislocations is theoretically simulated based on dislocation theory and the photoelastic *** comparing with the Raman spectrum,it is verified that the micropipes consist of edge *** different patterns of the RA images are due to the different orientations of the Burgers ***,the strain distribution of the micropipes is also *** can identify the dislocation type,the direction of the Burgers vector and the optical anisotropy from the RA image by using ***,SAM is an ideal tool to measure the optical anisotropy induced by the strain field around a defect.

关键词： scanning anisotropy microscopy SiC reflection anisotropy edge dislocation

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Reliable and broad-range layer identification of Au-assisted exfoliated large area MoS_(2)and WS_(2)using reflection spectroscopic fingerprints

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nano Research 2022年第9期15卷 8470-8478页

作者： Bo Zou Yu Zhou Yan Zhou Yanyan Wu Yang He Xiaonan Wang Jinfeng Yang Lianghui Zhang Yuxiang Chen Shi Zhou Huaixin Guo Huarui Sun School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System Harbin Institute of Technology ShenzhenShenzhen 518055China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China University of Science and Technology of China Hefei 230026China Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing Electronic Devices InstituteNanjing 210016China

The emerging Au-assisted exfoliation technique enables the production of a wealth of large-area and high-quality ultrathin two dimensional(2D)***,damage-free,and reliable determination of the layer number of such 2D films can greatly promote layer-dependent physical studies and device ***,an optical method has been developed for simple,high throughput,and accurate determination of the layer number for Au-assisted exfoliated MoS_(2)and WS_(2)films in a broad thickness *** method is based on quantitative analysis of layer-dependent white light reflection spectra(WLRS),revealing that the intensity of exciton-induced reflection peaks can be used as a clear indicator for identifying the layer *** simple yet robust method will facilitate fundamental studies on layer-dependent optical,electrical,and thermal properties and device applications of 2D *** technique can also be readily combined with photoluminescence(PL)and Raman spectroscopies to study other layer-dependent physical properties of 2D materials.

关键词： Au-assisted exfoliation MoS_(2)and WS_(2) layer identification white light reflection spectra excitonic peaks

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Negative differential resistance and quantum oscillations in FeSb_2 with embedded antimony

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Chinese Physics B 2019年第3期28卷 321-327页

作者： Fangdong Tang Qianheng Du Cedomir Petrovic Wei Zhang Mingquan He Liyuan Zhang Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices Renmin University of China Department of Physics Southern University of Science and Technologyand Shenzhen Institute for Quantum Science and Engineering Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Department of Materials Science and Chemical Engineering Stony Brook University Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing University

We present a systematical study on single crystalline FeSb2 using electrical transport and magnetic torque measurements at low temperatures. Nonlinear magnetic field dependence of Hall resistivity demonstrates a multi-carrier transport instinct of the electronic transport. Current-controlled negative differential resistance(CC-NDR) observed in currentvoltage characteristics below ～ 7 K is closely associated with the intrinsic transition ～ 5 K of FeSb2, which is, however,mediated by extrinsic current-induced Joule heating effect. The antimony crystallized in a preferred orientation within the FeSb2 lattice in the high-temperature synthesis process leaves its fingerprint in the de Haas-Van Alphen(dHvA) oscillations, and results in the regular angular dependence of the oscillating frequencies. Nevertheless, possible existence of intrinsic non-trivial states cannot be completely ruled out. Our findings call for further theoretical and experimental studies to explore novel physics on flux-free grown FeSb_2 crystals.

关键词： two-carrier transport negative differential resistance quantum oscillations FeSb2 with embedded antimony

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Remotely mind-controlled metasurface via brainwaves

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eLight 2022年第1期2卷 121-131页

作者： Ruichao Zhu Jiafu Wang Tianshuo Qiu Yajuan Han Xinmin Fu Yuzhi Shi Xingsi Liu Tonghao Liu Zhongtao Zhang Zuntian Chu Cheng‑Wei Qiu Shaobo Qu Shaanxi Key Laboratory of Artificially‑Structured Functional Materials and Devices Air Force Engineering UniversityXi’an 710051ShaanxiChina National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/Nano ElectronicsShanghai Jiao Tong UniversityShanghai 200240China Department of Electrical and Computer Engineering Faculty of EngineeringNational University of Singapore4 Engineering Drive 3Singapore 117583Singapore

The power of controlling objects with mind has captivated a popular fascination to human *** possible path is to employ brain signal collecting technologies together with emerging programmable metasurfaces(PM),whose functions or operating modes can be switched or customized via on-site programming or pre-defined ***,most of existing PMs are wire-connected to users,manually-controlled and not ***,we propose the concept of remotely mind-controlled metasurface(RMCM)via *** than DC voltage from power supply or AC voltages from signal generators,the metasurface is controlled by brainwaves collected in real time and transmitted wirelessly from the *** an example,we demonstrated a RMCM whose scattering pattern can be altered dynamically according to the user’s brain waves via *** attention intensity information is extracted as the control signal and a mapping between attention intensity and scattering pattern of the metasurface is *** such a framework,we experimentally demonstrated and verified a prototype of such metasurface system which can be remotely controlled by the user to modify its scattering *** work paves a new way to intelligent metasurfaces and may find applications in health monitoring,5G/6G communications,smart sensors,etc.

关键词： Brainwave Mind-controlled Reprogrammable metasurface Intelligent metasurface

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Brainmask:an ultrasoft and moist microelectrocorticography electrode for accurate positioning and long-lasting recordings

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microsystems & nanoengineering 2023年第5期9卷 295-307页

作者： Bowen Ji Fanqi Sun Jiecheng Guo Yuhao Zhou Xiaoli You Ye Fan Longchun Wang Mengfei Xu Wen Zeng Jingquan Liu Minghao Wang Huijing Hu Honglong Chang Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Collaborative Innovation Center of Northwestern Polytechnical University Shanghai 201108China Institute of Medical Research Northwestern Polytechnical UniversityXi’an 710072China College of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/Nano ElectronicsShanghai Jiao Tong UniversityShanghai 200240China

Bacterial cellulose(BC),a natural biomaterial synthesized by bacteria,has a unique structure of a cellulose nanofiberweaved three-dimensional reticulated *** films can be ultrasoft with sufficient mechanical strength,strong water absorption and moisture retention and have been widely used in facial *** films have the potential to be applied to implantable neural interfaces due to their conformality and moisture,which are two critical issues for traditional polymer or silicone *** this work,we propose a micro-electrocorticography(micro-ECoG)electrode named“Brainmask”,which comprises a BC film as the substrate and separated multichannel parylene-C microelectrodes bonded on the top *** can not only guarantee the precise position of microelectrode sites attached to any nonplanar epidural surface but also improve the long-lasting signal quality during acute implantation with an exposed cranial window for at least one hour,as well as the in vivo recording validated for one *** novel ultrasoft and moist device stands as a next-generation neural interface regardless of complex surface or time of duration.

关键词： recording electrode moisture

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Crystal growth and magnetic properties of quantum spin liquid candidate KErTe_(2)

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Chinese Physics B 2021年第10期30卷 577-581页

作者： Weiwei Liu Dayu Yan Zheng Zhang Jianting Ji Youguo Shi Feng Jin Qingming Zhang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China

Recently rare-earth chalcogenides have been revealed as a family of quantum spin liquid(QSL)candidates hosting a large number of *** this paper we report the crystal growth and magnetic measurements of KErTe_(2),which is the first member of telluride in the *** to its cousins of oxides,sulfides and selenides,KErTe_(2) retains the high symmetry of R3m and Er3+ions still sit on a perfect triangular *** separation between adjacent magnetic layers is expectedly increased,which further enhances the two dimensionality of the spin *** heat and magnetic susceptibility measurements on KErTe_(2) single crystals reveal no structural and magnetic transition down to 1.8 *** interestingly,the absorption spectrum shows that the charge gap of KErTe_(2) is roughly 0.93±0.35 eV,which is the smallest among all the reported members in the *** immediately invokes the interest towards metallization even superconductivity using the compound.

关键词： quantum spin liquids exchange and superexchange interactions magnetic anisotropy

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Fabrication multi-layer polymer microstructures by x-ray lithography with alignment

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作者： Li, Yigui Sugiyama, Susumu National Key Laboratory of Micro/Nano Fabrication Technology Research Institute of Micro/Nano Science and Technology Shanghai Jiao Tong University Shanghai 200240 China Department of Micro System Technology Rtsumeikan University 1-1-1 Noji-Higashi Kusatsu Shiga Japan

ISBN: (纸本)0878492119

Poly(methyl methacrylate)(PMMA) and Poly L-lactic acid (PLLA) are transparent and they are suitable for optical purposes. The multi-layer polymer microfabrication can be applied for a large displacement actuator and precision sensors. A new method is intruduced to generate the multi-layer polymers microstructures by X-ray lithography with alignment. The function of X-ray on polymer materials are breaking the polymer main chain and generating intermediates which can be degraded further and finally dissolved by the solvent interaction. The method for polymer micromachining by using X-ray lithography with alignment for fabrication multi-layer micro polymer structures is confirmed experimentatively. © (2011) Trans Tech Publications.

关键词： microfabrication

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Design and Comparison of micro electromagnetic vibration energy harvesters

Design and Comparison of micro electromagnetic vibration ene...

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16th Annual Conference and 5th International Conference on Chinese Society of micro-nano technology, CSMNT 2014

作者： Lei, Yiming Wen, Zhiyu Chen, Li Key Laboratory of Fundamental Science on Micro/Nano-Device and System Technology Chongqing University China Microsystem Research Center of Chongqing University Chongqing400030 China

ISBN: (纸本)9783038354628

This paper presents two electromagnetic vibration energy harvesters based on micro-electro-mechanical (MEMS) technology. Two prototypes with different vibration structures were designed and fabricated. The energy harvester includes a permanent magnet attached on vibration structure (resonator) made by Si and a fixed wire-wound coil, with the total volume of 0.9 cm3. Two energy harvesters with different resonator are tested and compared. Experiments show that: in the same acceleration and a load resistance, the resonant frequency of prototype B is approximately 95% of prototype A;The peak-peak voltage and the maximum power of prototype B is 1.6 times and 2.7 times of prototype A respectively. The test results was analyzed simply and it indicated that the electromagnetic energy harvesting with the spring B has better performance;also proved that the potential ability of the non-linear spring could extend the frequency bandwidth and improve output voltage. © (2015) Trans Tech Publications, Switzerland.

关键词： Electromagnetic induction

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Self-assembled MnO2 nanostructures for electrochemical capacitive energy storage

Self-assembled MnO2 nanostructures for electrochemical capac...

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第七届中国储能与动力电池及其关键材料学术研讨与技术交流会

作者： Yuxin Zhang Ming Huang Fei Li Min Kuang Shi Jin Zhu College of Materials Science and Engineering Chongqing University National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology Chongqing University

We would like to introduce the self-assembly of MnO nanostructures with controllable morphology for electrochemical supercapacitor,including mesoporous MnO nanotubes and their arrays,carbon-MnO coaxial nanotubes,CuO/M... 详细信息

关键词： MnO Self-assembled MnO2 nanostructures for electrochemical capacitive energy storage

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Self-assembled MnO2 nanostructures for electrochemical capacitive energy storage

Self-assembled MnO2 nanostructures for electrochemical capac...

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第二届海峡两岸功能材料科技与产业峰会（2015）

We would like to introduce the self-assembly of Mn O2 nanostructures with controllable morphology for electrochemical supercapacitor,including mesoporous Mn O2 nanotubes and their arrays,carbon-Mn O2 coaxial nanotubes,Cu O/Mn O2,Mn O2/diatomite,Ti O2/Mn O2,Co3O4-Sn O2/Mn O2,Mn O2-Ni foam,Mn O2-CNTs-Ni foam and Mn O2-Co3O4-Ni foam nanostructures[1-11].Noteworthily,it is the first time to synthesize

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