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Real-space visualization of intercalated water phases at the hydrophobic graphene interface with atomic force microscopy

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Frontiers of physics 2020年第2期15卷 69-77页

作者： Zhi-Yue Zheng Rui Xu Kun-Qi Xu Shi-Li Ye Fei Pang Le Lei Sabir Hussain Xin-Meng Liu Wei Ji Zhi-Hai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China State Key Laboratory of Digital Manufacturing Equipment and Technology Department of Instrument Science and TechnologySchool of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China University of Chinese Academy of Sciences Beijing 100039China

The phase behavior of water is a topic of perpetual interest due to its reinai kable anomalous properties and importance to biology,material science,geoscience,nanoscience,*** is predicted confined water at interface can exist in large amounts of crystalline or amorphous ***,the experimental evidence of coexistence of liquid water phases at interface is still ***,a special folding few-layers graphene film was elaborate prepared to form a hydrophobic/hydrophobic interface,which can provide a suited platform to study the structure and properties of confined liquid *** real-space visualization of intercalated water layers phases at the folding interface is obtained using advanced atomic force microscopy(AFM).The folding graphene interface displays complicated internal interfacial *** intercalated water molecules present themselves as two phases,low-density liquid(LDL,solid-like)and high-density liquid(HDL,liquid-like),according to their specific mechanical properties taken in two multifrequency-AFM(MF-AFM)***,the water molecules structural evolution is demonstrated in a series of continuous MF-AFM *** work preliminary confirms the existence of two liquid phases of water in real space and will inspire further experimental work to deeply understanding their liquid dynamics behavior.

关键词： 2D material interfacial intercalation coexistence of liquid water phases multifrequency-AFM hydrophobic graphene interface

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Raman scattering study of two-dimensional magnetic van der Waals compound VI3

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Chinese Physics B 2020年第5期29卷 420-423页

作者： Yi-Meng Wang Shang-Jie Tian Cheng-He Li Feng Jin Jian-Ting Ji He-Chang Lei Qing-Ming Zhang Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&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

The layered magnetic van der Waals materials have generated tremendous interest due to their potential applications and importance in fundamental *** x-ray diffraction(XRD)studies on the magnetic van der Waals compound VI3,revealed a structural transition above the magnetic transition but output controversial analysis on *** this paper we carried out polarized Raman scattering measurements on VI3 from 10 K to 300 K,with focus on the two Ag phonon modes at^71.1 cm^-1 and 128.4 *** careful symmetry analysis based on the angle-dependent spectra demonstrates that the crystal symmetry can be well described by C2h rather than D3d both above and below structural phase *** further performed temperature-dependent Raman experiments to study the magnetism in *** asymmetry and anomalous linewidth drop of two Ag phonon modes at low temperatures,point to a significant spin-phonon *** is also supported by the softening of 71.1-cm^-1 mode above the magnetic *** study provides the fundamental information on lattice dynamics and clarifies the symmetry in *** spin-phonon coupling existing in a wide temperature range revealed here may be meaningful in applications.

关键词： Raman scattering two-dimensional magnetic van der Waals materials lattice dynamics magnetism

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Flourescently visible Parylene-C coated pipette for targeted cell manipulation 20

Flourescently visible Parylene-C coated pipette for targeted...

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

作者： Zhang, L.Q. Liu, Y.P. Zhao, X.F. Li, Z.H. Wang, W. Institute of Microelectronics Peking University China School of Basic Medical Sciences Peking University China National Key Laboratory of Science and Technology on Micro/Nano Fabrication China Innovation Center for Micro-Nano-electronics and Integrated System China

ISBN: (纸本)9780979806490

This paper reported a novel fluorescent pipette with a high biocompatibility, high chemical inert-ness and excellent electrical insulating capability, by simply coating the pipette with Parylene-C. 500nm-thick Parylene-C was conformal deposited on the glass pipette with 2μm tip diameter. After annealing at 270°C for 1hour under N2, Parylene-C fluorescence was enhanced and visible under all three channels of fluorescence microscope. Experiment results showed that targeted cell manipulation can be achieved guided by the fluorescent of pipette tip. This method is promising to accomplish in-vivo optically targeted cell manipulation such as micro-injection and patch-clamp recordings.

关键词： Fluorescence

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A platform for integrated spectrometers based on solution-processable semiconductors

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Light(science & Applications) 2023年第9期12卷 1739-1748页

作者： Yanhao Li Xiong Jiang Yimu Chen Yuhan Wang Yunkai Wu De Yu Kaiyang Wang Sai Bai Shumin Xiao Qinghai Song Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of Technology(Shenzhen)ShenzhenGuangdong 518055China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 611731China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShan`xi 030006China

Acquiring real-time spectral information in point-of-care diagnosis,internet-of-thing,and other lab-on-chip applications require spectrometers with hetero-integration capability and miniaturized *** to conventional semiconductors integrated by heteroepitaxy,solution-processable semiconductors provide a much-flexible integration platform due to their solution-processability,and,therefore,more suitable for the multi-material integrated ***,solution-processable semiconductors are usually incompatible with the micro-fabrication *** work proposes a facile and universal platform to fabricate integrated spectrometers with semiconductor substitutability by unprecedently involving the conjugated mode of the bound states in the continuum(conjugated-BIC)***,exploiting the conjugated-BIC photonics,which remains unexplored in conventional lasing studies,renders the broadband photodiodes with ultra-narrowband detection ability,detection wavelength tunability,and on-chip integration ability while ensuring the device *** based on these ultra-narrowband photodiode arrays exhibit high spectral resolution and wide/tunable spectral *** fabrication processes are compatible with solution-processable semiconductors photodiodes like perovskites and quantum dots,which can be potentially extended to conventional *** from the spectrometers directly constitute the incident spectra without being computation-intensive,latency-sensitive,and *** an example,the integrated spectrometers based on perovskite photodiodes are capable of realizing narrowband/broadband light reconstruction and in-situ hyperspectral imaging.

关键词： semiconductors process integration

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Enrichment efficiency optimization of dielectrophoresis cell chip based on interdigitated microelectrodes array

Enrichment efficiency optimization of dielectrophoresis cell...

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

作者： Gu, Wenwen Huang, Jie Department of Electronic and Control Engineering College of Engineering and Technology Southwest University Chongqing400715 China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing400030 China

ISBN: (纸本)9783038354628

At present, the majority dielectrophoresis chip designs optimize their performance by electric simulation and fluid field simulation. The lack of further cells force analysis and movement prediction results in a limited cell dielectrophoresis enrichment efficiency. The HepG2 hepatoma carcinoma cell movement under the action of dielectrophoresis force, fluid force and gravity was analyzed respectively by Comsol Multiphysics software. The preliminary optimization conditions for the cell enrichment were obtained. According to the simulation results, the experiments were carried out to investigate the enrichment effect of the HepG2 hepatoma carcinoma cells. The experiment result demonstrated the enrichment efficiency of HepG2 hepatoma carcinoma cells was reached to 88.89% under the 5 V amplitude and 4 MHz frequency sinusoidal signal excitation. © (2015) Trans Tech Publications, Switzerland.

关键词： Efficiency

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Superconductivity in chromium nitrides Pr3Cr10-xN11 with strong electron correlations

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national science Review 2020年第1期7卷 21-26页

作者： Wei Wu Kai Liu Yanjie Li Zhenhai Yu Desheng Wu Yuting Shao Shihang Na Gang Li Ruizhen Huang Tao Xiang Jianlin Luo Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices Renmin University of China School of Physical Science and Technology Shanghai Tech University Songshan Lake Materials Laboratory Kavli Institute for Theoretical Sciences

Exploration of superconductivity in Cr-based compounds has attracted considerable interest because only a few Cr-based superconductors(CrAs, A2Cr3As3and ACr3As3（A = K, Rb, Cs, Na）) have been discovered so far and they show an unconventional pairing mechanism. We report the discovery of bulk superconductivity at 5.25 K in chromium nitride in Pr3Cr10-xN11with a cubic lattice structure. A relatively large upper critical field of Hc2（0）～12.6 T is determined, which is larger than the estimated Pauli-paramagnetic pair-breaking magnetic field. The material has a large electronic specific-heat coefficient of 170 mJ K-2mol-1—about 10 times larger than that estimated by the electronic structure calculation,which suggests that correlations between 3d electrons are very strong in Pr3Cr10-xN11, and thus quantum fluctuations might be involved. Electronic structure calculations show that the density of states at the Fermi energy are contributed predominantly by Cr 3d electrons, implying that the superconductivity results mainly from the condensation of Cr 3d electrons. Pr3Cr10-xN11represents a rare example of possible unconventional superconductivity emerging in a 3D system with strong electron correlations. Nevertheless,clarification of the specific pairing symmetry needs more investigation.

关键词： Cr-based superconductors nitrides strong electron correlations unconventional superconductivity

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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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Local probe of the interlayer coupling strength of few-layers SnSe by contact-resonance atomic force microscopy

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Frontiers of physics 2020年第6期15卷 105-113页

作者： Zhi-Yue Zheng Yu-Hao Pan Teng-Fei Pei Rui Xu Kun-Qi Xu Le Lei Sabir Hussain Xiao-Jun Liu Li-Hong Bao Hong-Jun Gao Wei Ji Zhi-Hai Cheng State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nano science and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China China North Vehicle Research Institute BeijingChina

The interlayer bonding in two-dimensional(2D)materials is particularly important because it is not only related to their physical and chemical stability but also afects their mechanical,thermal,elec-tronic,optical,and other *** address this issue,we report the direct characterization of the interlayer bonding in 2D SnSe using contact-resonance atomic force microscopy(CR-AFM)*** ***-specific CR spectroscopy and CR force spectroscopy measurements are performed on both SnSe and its supporting SiO2/Si substrate *** on the cantilever and contact mechanic models,the contact stifness and vertical Young's modulus are evaluated in comparison with SiO2/Si as a reference *** interlayer bonding of SnSe is further analyzed in combination with the semi-analytical model and density functional theory *** direct characteriza-tion of interlayer interactions using this non-destructive methodology of CR-AFM would facilitate a better understanding of the physical and chemical properties of 2D layered materials,specifically for interlayer intercalation and vertical heterostructures.

关键词： 2D materials interlayer bonding contact-resonance atomic force microscopy density functional theory

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Deep-red emitting Mg2Ti04:Mn^(4+)phosphor ceramics for plant lighting

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Journal of Advanced Ceramics 2021年第1期10卷 88-97页

作者： Zixin WANG Hui LIN Dawei ZHANG Yiming SHEN Yang LI Ruijin HONG Chunxian TAO Zhaoxia HAN Lei CHEN Shengming ZHOU Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modem Optical SystemUniversity of Shanghai for Science and TechnologyNo.516 Jungong RoadShanghai 200093China Department of Pathology Xinhua HospitalShanghai Jiaotong University School of MedicineShanghai 200093China Laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High-Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

In this study,deep-red emitting Mg2T i04:Mn4 phosphor ceramics were synthesized by the high temperature solid-state reaction *** ceramics can be excited by the 465 nm blue light and had a narrow emission with a full width at half maximum(FWMH)value of 31 *** peak wavelength was located at 658 nm,which matched the demanded wavelength for *** crystal field strength(Dq)and the Racah parameters(B and C)were estimated by the Tanabe-Sugano *** thermal conductivity of the Mg2Ti(0.999)O4:0.001Mn^(4+)ceramic was 7.535 W/(m·K)at room temperature,which was one order of magnitude higher than that of the traditional packaging method using the silicone gel.A set of phosphor converted LEDs were fabricated by mounting the phosphor ceramics onto the 460 nm blue LED chips and the CIE coordinates can move from the blue region to the purple light region with the thickness of the ceramic *** results indicated that the Mg2Ti04:Mn^(4+)phosphor ceramic was suitable for plant lighting when combined with a blue LED chip.

关键词： solid state reaction optical properties thermal conductivity ceramic phosphor

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Deriving phosphorus atomic chains from few-layer black phosphorus

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nano Research 2017年第7期10卷 2519-2526页

作者： Zhangru Xiao Jingsi Qiao Wanglin Lu Guojun Ye Xianhui Chen Ze Zhang Wei Ji Jixue Li Chuanhong Jin State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Department of Physics and Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-nano Devices Renmin University ot China Beijing 100872 China Key Laboratory of Strongly-coupled Quantum Matter Physics Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics University of Science and Technology of China Hefei 230026 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

Phosphorus atomic chains, the narrowest nanostructures of black phosphorus （BP）, are highly relevant to the in-depth development of BP-based one-dimensional （1D） nano-electronics components. In this study, we report a top-down route for the preparation of phosphorus atomic chains via electron beam sculpturing inside a transmission electron microscope （TEM）. The growth and dynamics （i.e., rupture and edge migration） of 1D phosphorus chains are experimentally captured for the first time. Furthermore, the dynamic behavior and associated energetics of the as-formed phosphorus chains are further investigated by density functional theory （DFT） calculations. It is hoped that these 1D BP structures will serve as a novel platform and inspire further exploration of the versatile properties of BP.

关键词： black phosphorus one-dimensionalatomic chain density functional theory

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