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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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Highly enhanced visible-light photocatalytic NOx purification and conversion pathway on self-structurally modified g-C-3N4 nanosheets

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science Bulletin 2018年第10期63卷 609-620页

作者： Yuhan Li Yanjuan Sun Wingkei Ho Yuxin Zhang Hongwei Huang Qiang Cai Fan Dong Chongqing Key Laboratory of Catalysis and New Environmental Materials Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of Education College of Environment and Resources Chongqing Technology and Business University Chongqing 400067. China Department of Science and Environmental Studies. The Center for Education in Environmental Sustainability The Education University of Hong Kong. Hong Kong China College of Materials Science and Engineering National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology. Chongqing University.Chongqing 400044. China School of Materials Science and Technology National Laboratory of Mineral Materials China University of Geosciences Beijing 100083 China

The unmodified graphitic carbon nitride(g-C_3N_4) suffers from low photocatalytic activity because of the unfavourable *** the present work,we reported a simple self-structural modification strategy to optimize the microstructure of g-C_3N_4 and obtained graphene-like g-C_3N_4 nanosheets with porous *** contrast to traditional thermal pyrolysis preparation of g-C_3N_4,the present thermal condensation was improved via pyrolysis of thiourea in an alumina crucible without a cover,followed by secondary heat *** popcorn-like formation and layer-by-layer thermal exfoliation of graphene-like porous g-C_3N_4 was proposed to explain the formation *** photocatalytic removal performance of both NO and NO_2 with the graphene-like porous g-C_3N_4 for was significantly enhanced by selfstructural *** experiments and in-situ diffuse reflectance infrared fourier transform spectroscopy(DRIFTS) measurement were conducted to detect the active species during photocatalysis and the conversion pathway of g-C_3N_4 photocatalysis for NO_x purification was *** photocatalytic activity of graphene-like porous g-C_3N_4 was highly enhanced due to the improved charge separation and increased oxidation capacity of the ·O_2^- radicals and *** work could not only provide a novel self-structural modification for design of highly efficient photocatalysts,but also offer new insights into the mechanistic understanding of g-C_3N_4 photocatalysis.

关键词： Self-structural modification g-C3N4 Visible light photocatalysis In-situ DRIFTS Conversion pathway

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A nano-metallic-particles-based CMOS image sensor for DNA detection

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Chinese Physics B 2012年第7期21卷 416-421页

作者：何进苏艳梅马玉涛陈沁王若楠叶韵马勇梁海浪 Micro&Nano Electronic Device and Integrated Technology Center School of Electronics Engineering and Computer SciencePeking University Peking University Shenzhen SOC Key Laboratory PKU-HKUST Shenzhen-Honggang InstitutionW303West TowerIER Bldg.Hi-Tech Industrial Park South

In this paper we report on a study of the CMOS image sensor detection of DNA based on self-assembled nano- metallic particles, which are selectively deposited on the surface of the passive image sensor. The nano-metallic particles effectively block the optical radiation in the visible spectrum of ordinary light source. When such a technical method is applied to DNA detection, the requirement for a special UV light source in the most popular fluorescence is eliminated. The DNA detection methodology is tested on a CMOS sensor chip fabricated using a standard 0.5 gm CMOS process. It is demonstrated that the approach is highly selective to detecting even a signal-base mismatched DNA target with an extremely-low-concentration DNA sample down to 10 pM under an ordinary light source.

关键词： CMOS image sensor nano-metallic particles DNA detection 0.5 gm CMOS process

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A Novel MOEMS NIR Spectrometer

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Physics Procedia 2011年 19卷 110-114页

作者： Zhang Zhihai Mo Xiangxia Guo Yuanjun Wang Wei The Key Laboratory for Opto-eletronic Technology and System under Ministry of Education Chongqing University Chongqing 400044China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing 400044China

In order to detect luminous intensity of light signal in NIR (Near-infrared) wavelength range, a novel MOEMS(micro-Opto-Electro-Mechanical systems) NIR spectrometer is proposed in the paper. It uses DMD (Digital micro-mirror device) to band filter the input spectrum. The merits of DMD are small size, low price and high scan speed. Especially, when DMD acts as a Hadamard Transform encoding mask, the SNR (signal-to-noise-ratio) can be improved by multiplexing the light intensities. The structure and the theory of this spectrometer are analyzed. The Hadamard-S matrix and mask of 63-order and 127-order are designed. The output spectrum of the new spectrometer coincides with experimental result of Shimadzu spectrometer. The resolution of the new spectrometer is 19 nm over the spectral range between 900∼1700 nm while single scan time is only 2.4S. The SNR is 44.67:1. The size of optical path is 70mm × 130 mm, and it has a weight less than 1Kg. It can meet the requirement of real time measurement and portable application.

关键词： MOEMS NIR spectrometer Digital micro-mirror device Hadamard transform portable application

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Enhanced phase-transfer kinetics achieved by atomic iron catalysts on hard carbon toward low-temperature sodium-ion batteries

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Chemical Engineering Journal 2025年

作者： Xinyi Qian Ziling Wu Jianan Gu Yanli Wang Xiaomin Cheng Jing Zhang Hongzhen Lin Jian Wang Liang Zhan Yongzheng Zhang State Key Laboratory of Green Chemical Engineering and Industrial Catalysis State Key Laboratory of Chemical Engineering Key Laboratory of Specially Functional Polymeric Materials and Related Technology (Ministry of Education) Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New Energy North China Electric Power University Beijing 100096 China i-Lab & CAS Key Laboratory of Nanophotonic Materials and Device Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China School of Materials Science and Engineering Xi’an University of Technology Xi’an 710048 China Helmholtz Institute Ulm (HIU) Ulm D89081 Germany Karlsruhe Institute of Technology (KIT) Karlsruhe D76021 Germany

Hard carbons with desirable pore morphologies are the most promising anode materials for sodium-ion batteries, but experience undesirable cycling stability and depressed capacity owing to sluggish reaction kinetics of sodium-related species through or across the carbon layer. Herein, based on closed pore morphology engineering using carbon dioxide physical activation method, the hard carbon composite (SAFe@HC) was prepared by coating a polydopamine capping layer with uniformly distributed iron single atoms on the closed-pore-rich hard carbon, where the introduction SAFe help to expand the layer spacing distance, providing additional channels for solvated Na + diffusion. It is innovatively proposed that SAFe catalysts provide abundant active catalytic sites for accelerating the interfacial desolvation and the phase-transfer kinetics of Na + is lowered by decreasing the sodium ion transport energy barrier, as confirmed by theoretical simulation and various electrochemical demonstration. In addition, the closed pore morphology also enhances the surface area and adsorbs more sodium ions. As a result, the SAFe@HC electrode exhibits a high reversible capacity of 340.7 mAh g −1 and a remarkable rate capacity up to 306.2 mAh g −1 and a high capacity-retention of 96.0 % after 500 cycles at 5C. Decreasing the environmental temperature to 0 °C, an excellent robust electrochemical performance of 172.2 mAh g −1 at 5C, offering promising avenues of single atomic catalysts achieving high-rate hard carbon electrode for sodium-ion batteries.

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trans-2-Enoyl-CoA Reductase Tecr-Driven Lipid Metabolism in Endothelial Cells Protects against Transcytosis to Maintain Blood-Brain Barrier Homeostasis

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Research 2022年第3期2022卷 75-89页

作者： Jinxuan Wang Jianxiong Xu Guangchao Zang Tao Zhang Qi Wu Hongping Zhang Yidan Chen Yi Wang Weixi Qin Shuang Zhao Erdai Qin Juhui Qiu Xiaojuan Zhang Lin Wen Yeqi Wang Guixue Wang Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsBioengineering College of Chongqing UniversityChongqing 400030China Institute of Life Science Laboratory of Tissue and Cell BiologyLab Teaching&Management CenterChongqing Medical UniversityChongqing 400016China Chongqing Key Laboratory of Nano/Micro Composite Material and Device School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqing 401331China College of Basic Medical Sciences Chongqing Medical UniversityChongqing 400016China

The transport and metabolism of lipids in cerebrovascular endothelial cells(ECs)have been hypothesized to regulate blood-brain barrier(BBB)maturation and ***-chain polyunsaturated fatty acids(LCPUFAs)as the important lipids components of cell membranes are essential for the development and function of BBB,but the direct links of lipid metabolism and ECs barrier function remain to be ***,we comprehensively characterize the transcriptomic phenotype of developmental cerebrovascular ECs in single-cell resolution and firstly find that trans-2-enoyl-CoA reductase(Tecr),a verylong-chain fatty acid synthesis,is highly expressed during barriergenesis and decreased after BBB ***-specific knockout of Tecr compromises angiogenesis due to delayed vascular ***,EC-specific deletion of Tecr loss restrictive quality of vascular permeability from neonatal stages to adulthood,with high levels of transcytosis,but maintains the vascular tight ***,lipidomic analysis shows that the expression of Tecr in ECs is associated with the containing of omega-3 fatty acids,which directly suppresses caveolae vesicles *** results reveal a protective role for Tecr in BBB integrity and suggest that Tecr as a novel therapeutic target in the central nervous system(CNS)diseases associated with BBB dysfunction.

关键词： metabolism barrier Blood

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Methods and techniques for MEMS dynamic characteristics measurement under the harsh environment

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micro and nanosystems 2012年第1期4卷 48-55页

作者： She, D.S. Wang, X.D. Wang, T. Zhang, X.W. Wang, L.D. Key Laboratory of Micro/Nano Technology and System of Liaoning Provice Research Center for MST Dalian University of Technology Nr. 2 Ling-Gong Road 116024 China School of mechanical Engineering Wuhan University of Science and Technology Nr.947 He-ping road 430081 China

In order to study the dynamic characteristics of microstructures under high-g acceleration and harsh temperature environment, dynamic measurement techniques were presented and the corresponding testing systems were established. For testing in high-g acceleration environment, the acceleration was generated by high speed rotation plate, and over 10000 g acceleration environment was created. The base excitation device designed with piezoelectric ceramic (PZT) was used to excite the microstructures. Piezoresistive cantilevers with typical beam-proof mass structure were designed and fabricated for obtaining the vibration signal. For testing in harsh temperature environment, two instruments were designed to realize the low temperature environment and high temperature environment, respectively. A thermoelectric refrigerator was modified to vary the temperature of microstructures from room temperature down to -55°C. A small alumina ceramics heater (MCH) was used to heat microstructures up to 350°C. The base excitation device with PZT was also used to excite microstructures under harsh temperature environment. Laser Doppler Vibrometer (LDV) was adopted to obtain the vibration signals through the viewport of these instruments. The dynamic characteristics of silicon microcantilevers were tested under these harsh environment. The results show that the resonance frequencies of microcantilevers increase with the elevated external high load as soon as the deformation of micro-beam is in the geometrically nonlinear state, and also the resonance frequencies slightly and linearly decrease with the increasing temperature. © 2012 Bentham science Publishers.

关键词： microstructure

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Narrow photonic-plasmonic resonances in petal-like capped-nanopillar resonators for real-time, ultrasensitive colorimetric sensing 20

Narrow photonic-plasmonic resonances in petal-like capped-na...

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20th International Conference on Miniaturized systems for Chemistry and Life sciences, microTAS 2016

作者： Fan, Jiaorong Wu, Wengang Zhu, Jia Yun, Huang National Key Laboratory of Science and Technology on Micro/Nano Fabrication Institute of Microelectronics Peking University Beijing100871 China Innovation Center for MicroNanoelectronics and Integrated System Beijing China

ISBN: (纸本)9780979806490

A new type of colorimetric sensing device composed of metallic nanopetal-capped-nanopillar array metasurface is reported. The device exhibits narrowband and harmonic reflection feature, and thus has excellent ability to produce vivid and bright colors. This is due to the effect of surface-plasmon (SP) coupling in the array of three-dimensional plasmonic petal-capped-pillar nanoresonators. We employ the device as an ultrasensitive colorimetric plasmon-resonance sensor to detect different refractive-index solutions with much striking color differences. The metasurface-based sensor can visually detect the surrounding medium in real-time with refractive index resolution of 2x10-3 units.

关键词： Refractive index

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Characteristic Analysis and the Experiment of Passive Matrix Addressing for Grating Light Modulator

Characteristic Analysis and the Experiment of Passive Matrix...

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中国微米纳米技术学会第十届学术年会暨第一届国际会议(1st International Conference of the Chinese Society of micro/nano technology)

作者： Jin Zhu Huang Shanglian Zhang Zhihai Wang Ning Zhang Jie Wei Wei The Key Laboratory of Fundamental Science of Micro/Nano Device & System Technology Chongqing400044China Optoelectronic Engineering Department Chongqing UniversityChongqing400044China

Grating Light Modulator (GLM) based on micro-Electro-Mechanical systems (MEMS) is applied in projection *** principle of GLM is introduced in the *** factors influencing the performance of passive matrix addressing for GLM are analyzed in *** the response frequency and the driving voltage are relative to the elastic coefficient of *** the elastic coefficient is larger,both response frequency and driving voltage are *** is indicated by analysis that in a m×n array when an all-selected pixel is actuated by a voltage V0,the voltages of half-selected pixel in row and column are respectively V0(m-1)/(m+n-1) and V0(n-1)/(m+n-1),and non-selected pixel's voltage is V0/(m+n-1).Finally,the operating voltage and the pull-in voltage are respectively 7.8V and 8.5V measured by the experiment,and these experimental values are very approximate to the theoretical *** GLM is actuated by a 7.8V square-wave voltage with lkHz frequency,the rising-edge time and the falling-edge time are respectively about 46.59μs and 44.77μ*** experiments indicate that the response frequency of GLM is about ***,the other experiment validates the correctness of crosstalk in a 16×16 GLM *** experiments provide a theoretical basis for improving the driver of GLM.

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Emerging material platforms for integrated microcavity photonics

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science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 10-28页

作者： Jin Liu Fang Bo Lin Chang Chun-Hua Dong Xin Ou Blake Regan Xiaoqin Shen Qinghai Song Baicheng Yao Wenfu Zhang Chang-Ling Zou Yun-Feng Xiao State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510000China MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300071China State Key Laboratory of Advanced Optical Communications System and Networks School of ElectronicsPeking UniversityBeijing 100871China CAS Key Lab of Quantum Information University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Functional Material for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Mathematical and Physical Sciences University of Technology SydneyUltimo 2007Australia School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of TechnologyShenzhen 518055China Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education) University of Electronic Science and Technology of ChinaChengdu 611731China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Many breakthroughs in technologies are closely associated with the deep understanding and development of new material *** the main material used in microelectronics,Si also plays a leading role in the development of integrated *** indirect bandgap,absence ofχ(2)nonlinearity and the parasitic nonlinear absorptions at the telecom band of Si imposed technological bottlenecks for further improving the performances and expanding the functionalities of Si microcavities in which the circulating light intensity is dramatically *** past two decades have witnessed the burgeoning of the novel material platforms that are compatible with the complementary metal-oxide-semiconductor(COMS)*** particular,the unprecedented optical properties of the emerging materials in the thin film form have resulted in revolutionary progress in microcavity *** this review article,we summarize the recently developed material platforms for integrated photonics with the focus on chip-scale microcavity *** material characteristics,fabrication processes and device applications have been thoroughly discussed for the most widely used new material *** also discuss open challenges and opportunities in microcavity photonics,such as heterogeneous integrated devices,and provide an outlook for the future development of integrated microcavities.

关键词： microcavity integrated optics nonlinear optics

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