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Nano research 2021年第8期14卷 2770-2775页

作者： Yu Zhang Guishun Li Changkun She Shaohua Liu Fangyu Yue Chengbin Jing Ya Cheng Junhao Chu engineering research center for nanophotonics and advanced instrument of Ministry of Education Key Laboratory of Polar Materials and Devices(Ministry of Education)The Extreme Optoelectromechanics LaboratoryDepartment of MaterialsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

The poor stability of halide perovskite nanocrystals(NCs)has severely hindered future practical ***,we proposed a facile and effective ligand modification route to synthesize stable CsPbBr_(3) nanocrystals by introducing a double-terminal ligand,namely 4,4'-Azobis(4-cyanovalericacid)(CA),to replace the conventional oleic acid(OA)ligand at room *** as-synthesized CsPbBr_(3)-CA not only possesses high photoluminescence quantum yield(72%)related to the reduced trap defects,but also shows significantly improved stability exposure to water,ethanol,light,and/or heat benefiting from the CA ligand anchored to NC surfaces *** photoluminescence intensity of CsPbBr_(3)-CA maintains about 80%and 75%of its initial emission intensity after immersed in water or ethanol for 360 min,respectively,whereas that of the CsPbBr_(3)-OA was quenched completely within a few ***,an all-inorganic white light-emitting diode(LED)covered 126%National Television System Committee(NTSC)standard and 92%Rec.2020 standard was fabricated by combining the green CsPbBr_(3)-CA and commercial red-emitting K2SiF6:Mn4+(KSF)phosphors onto a blue LED ***,the presented work initiates the development of the room temperature preparation of high quality CsPbBr_(3) and shows prospect for next-generation displays.

关键词： perovskite nanocrystals ligand modification stability white light-emitting diode

Managing excess PbI_(2)for efficient perovskite solar cells

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Journal of Semiconductors 2023年第8期44卷 7-9页

作者： Xiaodong Li Jie Sun Bozhang Li Junfeng Fang Liming Ding School of Physics and Electronic Science Engineering Research Center of Nanophotonics&Advanced Instrument(MoE)East China Normal UniversityShanghai 200062China center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China East Chapel Hill High School Chapel HillNC 27514USA

Perovskite solar cells(PSCs)have attracted much attention due to their low cost,high efficiency and easy ***,You et *** a record efficiency of 26.1%(certified 25.6%)in PSCs with excellent stability[1].Excess PbI_(2) in perovskite films was converted into inactive(PbI_(2))2RbCl to avoid its detrimental effect to device stability,while maintaining its positive effect to device efficiency.

关键词： perovskite stability excess

Light control of droplets on photo-induced charged surfaces

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National Science Review 2023年第1期10卷 259-267页

作者： Fang Wang Meijin Liu Cong Liu Chao Huang Lidong Zhang Anyang Cui Zhigao Hu Xuemin Du Institute of Biomedical and Health engineering Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemistry and Molecular engineering East China Normal University Technical center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics and Advanced Instrument(Ministry of Education)Department of Physics School of Physics and Electronic Science East China Normal University

The manipulation of droplets plays a vital role in fundamental research and practical applications,from chemical reactions to *** an intriguing and active format,light control of droplets,typically induced by photochemistry,photomechanics,light-induced Marangoni effects or light-induced electric fields,enables remote and contactless control with remarkable spatial and temporal ***,current light control of droplets suffers from poor performance and limited *** we develop a new superamphiphobic material that integrates the dual merits of light and electric field by rationally preparing liquid metal particles/poly(vinylidene fluoride-trifluoroethylene) polymer composites with photo-induced charge generation capability in real time,enabling light control of droplets on the basis of photo-induced dielectrophoretic *** demonstrate that this photo-induced charged surface(PICS)imparts a new paradigm for controllable droplet motion,including high average velocity(～35.9 mm s-1),unlimited distance,multimode motions(***,backward and rotation) and single-to-multiple droplet manipulation,which are otherwise unachievable in conventional *** further extend light control of droplets to robotic and bio-applications,including transporting a solid cargo in a closed tube,crossing a tiny tunnel,avoiding obstacles,sensing the changing environment via naked-eye color shift,preparing hydrogel beads,transporting living cells and reliable *** PICS not only provides insight into the development of new smart interface materials and microfluidics,but also brings new possibilities for chemical and biomedical applications.

关键词： light control droplet manipulation smart surface liquid metal ferroelectric

Non-Hermitian polarization quantized by time-reversal symmetry

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 141-147页

作者： Jing Cheng Jinbing Hu Zhigao Hu Lin Chen Minghui Lu Songlin Zhuang Technical center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)Department of Physics and Electronic ScienceEast of China Normal UniversityShanghai200241China College of Optical-Electrical Information and Computer engineering University of Shanghai for Science and TechnologyShanghai200093China Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China National Laboratory of Solid State Microstructures Science and engineering Nanjing UniversityNanjing210093China

It is well known that in one-dimensional(1D) crystalline insulators,the electric polarization is a manifestation of Berry phase,which can not be quantized by time-reversal symmetry(TRS) as in Hermitian physics TRS does not induce any topological phase in one *** this paper we report that even though associated with complex eigenenergies a 1D non-Hermitian insulator obeying only TRS is capable of presenting quantized bulk *** underlying physical reason is unveiled:TRS guarantees the complex energies to come in pair(E,E*),and the corresponding decaying and amplifying wave functions also come in pair and have the same variation rate,hence,giving rise to a stable wannier *** electron transport is performed by means of charge pumping process,which verifies the physical mechanism *** last,we discuss the possible experimental implementation of the proposed model by means of twisted-π gauge flux.

关键词： non-Hermitian polarization time-reversal symmetry complex hopping

Investigations of range accuracy for long-range three-dimensional active imaging

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Chinese Optics Letters 2011年第6期9卷 48-50页

作者：张秀达严惠民周琴 State Key Laboratory of Modern Optical instrument National Engineering Research Center for Optical Instrument Optical Engineering Department Zhejiang University

Distance resolutions and noises are analyzed experimentally for long-range three-dimensional （3D） active imaging systems that have signal-to-noise ratios （SNRs） more optimal than 30：1. Findings indicate that the photon shot noise primarily determines the SNR. However, the active imaging method, which has a relatively low SNR, generates a relatively high distance resolution. To explain this phenomenon, a theory in which the distance resolution of 3D active imaging systems is determined by both the photon shot noise and the subinterval width is developed. Theoretical and experimental results differ by less than 4%.

关键词： Imaging systems Photons Shot noise Signal to noise ratio

Fabrication of highly efficient heterostructured Ag-CeO2/g-C3N4 hybrid photocatalyst with enhanced visible-light photocatalytic activity

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Journal of Rare Earths 2019年第12期37卷 1269-1278页

作者： Chengbao Liu Dongxing Mao Jian Pan Junchao Qian Wenya Zhang Feng Chen Zhigang Chen Yenan Song Jiangsu Key Laboratory for Environment Functional Materials Suzhou University of Science and TechnologySuzhou 215009China Department of Materials Science and engineering Rutgers-The State University of New JerseyNew Jersey 08854USA engineering research center for nanophotonics and advanced instrument Ministry of EducationSchool of Physics and Materials ScienceEast China Normal UniversityShanghai 200062China

On the basis of hydrothermal synthesis of Ag-CeO2 microspheres,Ag-CeO2/g-C3N4 composite photocatalyst with heterostructure was prepared by simple solvent evaporation of Ag-CeO2 and *** characterize the composition,structure,morphology and light absorption properties of the as-prepared Ag-CeO2/g-C3N4 composites,XRD,FTIR XPS,SEM,TEM,PL,BET and UV-vis DRS were used,*** as-prepared photocatalyst was subjected to photocatalytic degradation of pollutants,and the prepared composite material has excellent photocatalytic activity for photodegradation of methylene blue(MB).The research shows that the photocatalytic properties of Ag-CeO2/g-C3N4 composites were related to the mass ratio of Ag-CeO2 microspheres and g-C3N4 *** the ratio of Ag-CeO2 microspheres:g-C3N4 is 1:5,the composites have the highest photocatalytic activity,which was 9.6 and 3.3 times that of single Ag-CeO2 and g-C3N4,*** improvement of photocatalytic activity is attributed to the heterostructure between the composite materials and the addition of noble metal silver,and the degradation of methylene blue by the visible light irradiation material is greatly ***,an attempt was made to analyze the principle of photocatalytic degradation of pollutants in prepared materials.

关键词： Ceria Silver Carbon nitride Photocatalytic degradation Methylene blue Rare earths

Magnetoelastic coupling effect of Fe10Co90 films grown on different flexible substrates

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Chinese Physics B 2020年第11期29卷 479-484页

作者： Jiapeng Zhao Qinhuang Guo Huizhong Yin Jintang Zou Zhenjie Zhao Wenjuan Cheng Dongmei Jiang Qingfeng Zhan Key Laboratory of Polar Materials and Devices(MOE)and State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China engineering research center for nanophotonics and advanced instrument School of Physics and Electronic ScienceEast China Normal UniversityMinistry of EducationShanghai 200241China

The magneto-mechanical coupling effect and magnetic anisotropy of Fe10Co90(FeCo)films deposited on silicon wafer(Si),flexible polyethylene terephthalate(PET),freestanding polydimethylsiloxane(PDMS),and pre-stretched 20%PDMS substrates were studied in *** loop squareness ratio Mr/Ms and the coercive Hc of the FeCo film grown on a PET substrate can be obviously tuned by applying a small tensile-bending strain,and those of the FeCo film grown on a freestanding PDMS substrate can only be slightly changed when applying a relatively large tensile bending *** the FeCo film prepared on a 20%pre-stretched PDMS,a wrinkled morphology is obtained after removing the *** wrinkled FeCo film can keep the magnetic properties unchanged when applying a relatively large tensile bending strain perpendicular to the *** reveals that PDMS is an ideal substrate for magnetic films to realize flexible *** results may help for developing flexible magnetic devices.

关键词： flexible substrates FeCo films magnetic anisotropy magneto-mechanical coupling effect

Optical system and lens design for Blu-ray disc optical pick-up

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Chinese Optics Letters 2008年第6期6卷 426-430页

作者：李莉华潘龙法马建设 Optical Memory National engineering research center Department of Precision Instrument and MechanologyTsinghua University

During the design process of Blu-ray disc optical pick-up （BD OPU）, the optical system and the collimator lens design is especially important. This paper designs an optical system and some lenses for＇the BD OPU, including collimator lens, beam shaping lens for laser beam shaping, and cylinder lens for signal detecting. In this OPU, we use a triplet lens to collimate the laser beam. At the same time, we build a series of assembly jigs to make sure that each lens can be put into the OPU basement properly. At last, we get the reading spot image and S-curve photo of OPU, which can be used to read Blu-ray disc （BD）.

关键词： Computer networks Design Laser beams Optical collimators Optical data processing Optical devices Optical instrument lenses Optical systems Photolithography Process design Process engineering Soldered joints

Experiments of Multi-Level Read-Only Recording Using Readout Signal Wave-Shape Modulation

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Chinese Physics Letters 2008年第5期25卷 1709-1712页

作者：唐毅裴京潘龙法倪屹胡华张布卿 Optical Memory National engineering research center Department of Precision Instrument Tsinghua University Beijing 100084

An innovative multilevel read-only recording method is proposed. In this method, a short pit/land is deliberately inserted to the original land/pit. This modifies the wave-shape of readout signM. Taking the wave-shape as the symbol of level detection, a signal wave-shape modulation （SWSM） multilevel method is realized. This method is carried out and validated on the DVD read-only manufacture and readout system. A capacity of 15 GB can be expected, and a bit error rate of 10-4 is achieved. The capacity can meet the demand of high definition movie publication. This method also provides a potential multi-level solution for other storage formats and systems.

关键词： supernova explosion proto-neutron star shock wave

Advances in isolation and detection of circulating tumor cells based on microfluidics

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Cancer Biology & Medicine 2018年第4期15卷 335-353页

作者： Dan Zou Daxiang Cui Institute of Nano Biomedicine and engineering Shanghai Engineering Research Center for Intelligent Instrument for Diagnosis and Therapy Department of Instrument Science & Engineering School of Electronic Information and Electrical Engineering National Center for Translational Medicine Collaborative Innovational Center for System Biology Shanghai Jiao Tong University

Circulating tumor cells(CTCs) are the cancer cells that circulate in the peripheral blood after escaping from the original or metastatic tumors. CTCs could be used as non-invasive source of clinical information in early diagnosis of cancer and evaluation of cancer development. In recent years, CTC research has become a hotspot field wherein many novel CTC detection technologies based on microfluidics have been developed. Great advances have been made that exhibit obvious technical advantages, but cannot yet satisfy the current clinical requirements. In this study, we review the main advances in isolation and detection methods of CTC based on microfluidics research over several years, propose five technical indicators for evaluating these methods, and explore the application prospects. We also discuss the concepts, issues, approaches, advantages, limitations, and challenges with an aim of stimulating a broader interest in developing microfluidics-based CTC detection technology.

关键词： Circulating tumor cells isolation and detection microfluidics