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Isovalent co-alloying contributes to considerable improvement in thermoelectric performance of BiSe bulks with weak anisotropy

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Journal of Materiomics 2024年第5期10卷 965-974页

作者： Fu Li Chen Liu Mohammad Nisar Jian Zhao Chongbin Liang Junze Zhang Ziyuan Wang Zhuanghao Zheng Ping Fan Xilin Wang Zhen-Hua Ge Yue-Xing Chen shenzhen key laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060GuangdongChina Kunming university of Science and Technology Kunming650093China Tsinghua shenzhen International Graduate School Tsinghua UniversityShenzhen518060GuangdongChina

BiSe with intrinsic low thermal conductivity has considered as a promising thermoelectric(TE)material at nearly room *** improve its low thermoelectric figure of merit(zT),in this work,Sb and Te isovalent co-alloying was performed and significantly optimized its TE property with weakly anisotropic *** substituting Sb on Bi sites,the carrier concentration is suppressed by introduction of Sbsingle bond Se site defects,which contributes to the increased absolute value of Seebeck coefficient(|S|).Further co-alloying Te on Se of the optimized composition Bi_(0.7)Sb_(0.3)Se,the carrier concentration increased without affecting the|S|due to the enhanced effective mass,which leads to a highest power factor of 12.8μW/(cm·K^(2))at 423 *** a result,a maximum zT of∼0.54 is achieved for Bi_(0.7)Sb_(0.3)Se_(0.7)Te_(0.3) along the pressing direction and the average zT(zTave)(from 300 K to 623 K)are drastically improved from 0.24 for pristine BiSe sample to ***,an energy conversion efficiency∼4.0%is achieved for a single leg TE device of Bi_(0.7)Sb_(0.3)Se_(0.7)Te_(0.3)when applied the temperature difference of 339 K,indicating the potential TE application.

关键词： BiSe Isovalent alloying zT Carrier modulation

Microstructured Cantilever Probe on Optical Fiber Tip for Microforce Sensor

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Photonic Sensors 2024年第2期14卷 89-99页

作者： Famei WANG Changrui LIAO Mengqiang ZOU Dejun LIU Haoqiang HUANG Chao LIU Yiping WANG shenzhen key laboratory of Ultrafast Laser Micro/Nano Manufacturing Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China shenzhen key laboratory of Photonic devices and Sensing systems for Internet of Things Guangdong and Hong Kong Joint Research Centre for Optical Fibre SensorsState Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China School of Electronics Science Northeast Petroleum UniversityDaqing 163318China

Benefiting from the great advances of the femtosecond laser two-photon polymerization(TPP)technology,customized microcantilever probes can be accurately 3-dimensional(3D)manufactured at the nanoscale size and thus have exhibited considerable potentials in the fields of microforce,micro-vibration,and microforce *** this work,a controllable microstructured cantilever probe on an optical fiber tip for microforce detection is demonstrated both theoretically and *** static performances of the probe are firstly investigated based on the finite element method(FEM),which provides the basis for the structural *** proposed cantilever probe is then 3D printed by means of the TPP *** experimental results show that the elastic constant k of the proposed cantilever probe can be actively tuned from 2.46N/m to 62.35N/*** force sensitivity is 2.5nm/μN,the Q-factor is 368.93,and the detection limit is ***,the mechanical properties of the cantilever probe can be flexibly adjusted by the geometric configuration of the ***,it has an enormous potential for matching the mechanical properties of biological samples in the direct contact mode.

关键词： Optical fiber sensor microforce sensing microstructured cantilever two-photon polymerization

Mechanoluminescent Materials Enable Mechanochemically Controlled Atom Transfer Radical Polymerization and Polymer Mechanotransduction

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Research 2024年第3期2023卷 97-104页

作者： Zexuan Li Zhenhua Wang Chen Wang Wenxi Li Wenru Fan Ruoqing Zhao Haoyang Feng Dengfeng Peng Wei Huang Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072China. School of Materials Science and engineering Northwestern Polytechnical UniversityXi’an 710072China key laboratory of optoelectronic devices and systems of ministry of education and guangdong province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China.

Organic mechanophores have been widely adopted for polymer ***,most examples of polymer mechanotransduction inevitably experience macromolecular chain rupture,and few of them mimic mussel’s mechanochemical regeneration,a mechanically mediated process from functional units to functional materials in a controlled *** this paper,inorganic mechanoluminescent(ML)materials composed of CaZnOS-ZnS-SrZnOS:Mn2+were used as a mechanotransducer since it features both piezoelectricity and *** utilization of ML materials in polymerization enables both mechanochemically controlled radical polymerization and the synthesis of ML polymer *** procedure features a mechanochemically controlled manner for the design and synthesis of diverse mechanoresponsive polymer composites.

关键词： chemically polymerization luminescent

Texture and Se vacancy optimization induces high thermoelectric performance in Bi_(2)Se_(3) flexible thin films

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Rare Metals 2024年第6期43卷 2796-2804页

作者： Dong-Wei Ao Wei-Di Liu Yue-Xing Chen Fan Ma Yi-Jie Gu Zhuang-Hao Zheng School of Machinery and Automation Weifang UniversityWeifang 261061China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane 4072Australia shenzhen key laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China School of Materials Science and engineering Inner Mongolia University of TechnologyHohhot 010051China

Bi_(2)Se_(3)-based flexible thin film with high thermoelectric performance is promising for the waste heat recovery *** this work,a novel post-selenization method is employed to prepare n-type Bi_(2)Se_(3)flexible thin films with highly textured *** strengthened texture and Se vacancy optimization can be simultaneously achieved by optimizing the selenization *** highly oriented texture leads to the increased carrier mobility and results in a high electric conductivity of~290.47 S·cm^(-1)at 623 ***,a high Seebeck coefficient(>110μW·K-1)is obtained due to the reduced carrier concentration,induced by optimizing vacancy ***,a high power factor of 3.49μW·cm^(-1)·K^(-2)at 623 K has been achieved in asprepared highly-bendable Bi_(2)Se_(3)flexible thin films selenized at 783 *** study introduces an effective post-selenization method to tune the texture structure and vacancies of Bi_(2)Se_(3)flexible thin films,and correspondingly achieves high thermoelectric performance.

关键词： Thermoelectric Bi_(2)Se_(3) Flexible thin film Post-selenization

Femtosecond laser 3D printed micro objective lens for ultrathin fiber endoscope

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Fundamental Research 2024年第1期4卷 123-130页

作者： Bozhe Li Changrui Liao Zhihao Cai Jie Zhou Cong Zhao Liqing Jing Jiaqi Wang Cong Xiong Lei Xu Ying Wang Yiping Wang key laboratory of optoelectronic devices and systems of ministry of education/guangdong province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China shenzhen key laboratory of Photonic devices and Sensing systems for Internet of Things Guangdong and Hong Kong Joint Research Centre for Optical Fibre SensorsShenzhen UniversityShenzhen 518060China School of Electronic and Communication engineering Shenzhen Polytechnic UniversityShenzhen 518055China

The most important optical component in an optical fiber endoscope is its objective *** achieve a high imaging performance level,the development of an ultra-compact objective lens is thus the key to an ultra-thin optical fiber *** this work,we use femtosecond laser 3D printing to develop a series of micro objective lenses with different optical *** imaging resolution and field-of-view performances of these printed micro objective lenses are investigated via both simulations and *** the first time,multiple micro objective lenses with different fields of view are printed on the end face of a single imaging optical fiber,thus realizing the perfect integration of an optical fiber and objective *** work demonstrates the considerable potential of femtosecond laser 3D printing in the fabrication of micro-optical systems and provides a reliable solution for the development of an ultrathin fiber endoscope.

关键词： Femtosecond laser Two-photon polymerization 3D printing Micro objective lens Fiber endoscope

Theory and verification of moiréfringes for x-ray three-phase grating interferometer

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Chinese Physics B 2024年第5期33卷 532-540页

作者：单雨征葛永帅杨君郭大育蔡学宝刘晓珂侯晓文郭金川 key laboratory of optoelectronic devices and systems of the ministry of education Key Laboratory of Optoelectronic Devices and Systems of the Department of EducationGuangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Research Center for Medical Artificial Intelligence Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Institute of Advanced Science Facilities Shenzhen 518107China Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China college of Biophotonics South China Normal UniversityGuangzhou 510631China MinFound Medical systems Co. Ltd.Hangzhou 310018China

Dual-phase and three-phase grating x-ray interference is a promising new technique for grating-based x-ray differential phase contrast ***-phase grating interferometers have been relatively completely studied and *** this paper,the corresponding imaging fringe formula of the three-phase grating interferometer is *** the same time,the similarities and differences between the three-phase grating interferometer and the dual-phase grating interferometer are investigated and verified,and that the three-phase grating interferometer can produce large-period moiréfringes without using the analyzing grating is demonstrated ***,a simple method of designing three-phase grating and multi-grating imaging systems from geometric optics based on the thin-lens theory of gratings is *** theoretical formulas and experimental results provide optimization tools for designing three-phase grating interferometer systems.

关键词： x-ray phase contrast phase grating moiréfringe

miR319-TCPs-TGA9/TGA10/ROXY2 regulatory module controls cell fate specification in early anther development in Arabidopsis

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Science China(Life Sciences) 2024年第4期67卷 839-842页

作者： Jinyuan Tao Zijie Pan Wenwen Kong Beixin Mo Xuemei Chen Yu Yu guangdong Provincial key laboratory for Plant Epigenetics Longhua Bioindustry and Innovation Research InstituteCollege of Life Sciences and OceanographyShenzhen UniversityShenzhen 518060China key laboratory of optoelectronic devices and systems of ministry of education and guangdong province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China School of Life Sciences Peking-Tsinghua Joint Center for Life SciencesPeking UniversityBeijing 100871China

Dear Editor,The process of anther development is generally conserved across plant species(Ma,2005).Many protein-coding genes and noncoding RNAs have been identified to participate in early anther development in Arabidopsis(Walbot and Egger,2016).mi R319 is one of the most ancient and conserved mi RNA families in land plants(Chávez Montes et al.,2014).

关键词： Arabidopsis miR319 ancient

Morphology-Tailored Dynamic State Transition in Active-Passive Colloidal Assemblies

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Research 2024年第3期2024卷 751-760页

作者： Nan Yu Zameer H.Shah Mingcheng Yang Yongxiang Gao Institute for Advanced Study Shenzhen University518060ShenzhenChina key laboratory of optoelectronic Device and systems of ministry of education and guangdong province College of Optoelectronic EngineeringShenzhen University518060ShenzhenChina Beijing National laboratory for Condensed Matter Physics and laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials laboratory DongguanGuangdong 523808China.

Mixtures of active self-propelled and passive colloidal particles promise rich assembly and dynamic states that are beyond reach via equilibrium ***,controllable transition between different dynamic states remains ***,we reveal a plethora of dynamic behaviors emerging in assemblies of chemically propelled snowman-like active colloids and passive spherical particles as the particle shape,size,and composition are *** example,assembles of one or more active colloids with one passive particle exhibit distinct translating or orbiting states while those composed of one active colloid with 2 passive particles display persistent“8”-like cyclic motion or hopping between circling states around one passive particle in the plane and around the waist of 2 passive ones out of the plane,controlled by the shape of the active colloid and the size of the passive particles,*** morphology-tailored dynamic transitions are in excellent agreement with state diagrams predicted by mesoscale dynamics *** work discloses new dynamic states and corresponding transition strategies,which promise new applications of active systems such as micromachines with functions that are otherwise impossible.

关键词： Transition otherwise transitions

Iterative multi-photon adaptive compensation technique for deep tissue two-photon fluorescence lifetime imaging

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Chinese Optics Letters 2024年第4期22卷 89-94页

作者：王柯欣余文慧屈军乐廖常锐王义平何俊刘丽炜 State key laboratory of Radio Frequency Heterogeneous Integration(shenzhen university) Shenzhen 518060China key laboratory of optoelectronic devices and systems of guangdong province&ministry of education College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

Fluorescence lifetime imaging can reveal the high-resolution structure of various biophysical and chemical parameters in a microenvironment ***,the depth of imaging is generally limited to hundreds of micrometers due to aberration and light scattering in biological *** paper introduces an iterative multi-photon adaptive compensation technique(IMPACT)into a two-photon fluorescence lifetime microscopy system to successfully overcome aberrations and multiple scattering problems in deep *** shows that 400 correction modes can be achieved within 5 min,which was mainly limited by the frame rate of a spatial light *** system was used for high-resolution imaging of mice brain tissue and live zebrafish,further verifying its superior performance in imaging quality and photon accumulation speed.

关键词： adaptive optics iterative optimization two-photon fluorescence lifetime imaging microscopy wavefront correction