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8th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Deng, Ya Zhou, Yufeng Zhang, Yumin National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

The residual stress distribution induced by nanosecond UV laser irradiation on the surface of SiC single crystal was detected through X-ray stress measurement method in this manuscript. In order to explain the generation mechanism of the residual stresses, the surface morphology of the laser ablation zone was characterized by laser scanning confocal microscopy. Besides, the material compositions of the ablation zone were also observed by using energy dispersive X-ray spectrometer. The measurement results indicated that tensile stress distribution existed around the laser-irradiated zone, while the center position of the laser spot had the smaller residual stresses. There were obvious bulges at the ablation zone margin, which may be caused by the melting of the material and the splashing and re-solidification of molten material in the ablation hole. In addition, there exists oxidation phenomenon in the irradiated region by comparing the EDS results of laser irradiated and unirradiated regions. This suggested that the temperature reached its melting point and photothermal ablation occurred when laser irradiated on the surface of the silicon carbide specimen. Therefore, it can be concluded that the existence of residual stresses was related to the local thermal expansion caused by laser irradiation. And the residual stresses at the marginal zone had the larger tensile stresses because of the transverse extrusion effect. © 2022 SPIE

关键词： Silicon carbide

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Lowing the energy loss of organic solar cells by molecular packing engineering via multiple molecular conjugation extension

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science China Chemistry 2022年第7期65卷 1362-1373页

作者： Hongbin Chen Yalu Zou Huazhe Liang Tengfei He Xiaoyun Xu Yunxin Zhang Zaifei Ma Jing Wang Mingtao Zhang Quanwen Li Chenxi Li Guankui Long Xiangjian Wan Zhaoyang Yao Yongsheng Chen State Key Laboratory and Institute of Elemento-Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China School of Materials Science and Engineering National Institute for Advanced MaterialsRenewable Energy Conversion and Storage Center(RECAST)Nankai UniversityTianjin 300350China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Materials Science&Engineering Tianjin University of TechnologyTianjin 300384China

The central unit(benzo[c][1,2,5]thiadiazole) in Y6 series of molecules plays a determining role in their unique intermolecular packing for a three-dimensionally(3D) network, largely endowing their organic solar cells(OSCs) with so far the best power conversion efficiencies(PCEs) and also largely suppressed energy losses(Eloss). Despite its vital role in molecular packing, very few explorations for central unit have been conducted due to possibly the constructing challenge of central heterocyclic ***, a highly efficient acceptor-donor-acceptor(A-D-A) type electron acceptor, CH17, has been designed and constructed,featured with a prominent π extension in both directions of the central and end units with respect to Y6 series. Such a multiple and much enhanced conjugation extension in CH17 enables a much more effective and compact 3D molecular packing compared with that of Y6 supported by X-ray single crystal and other analysis, mainly caused by a newly observed distinctive dual “end unit to central unit” packing mode. This much favorable molecular packing, also kept in its blends with donor materials, leads a larger electron and hole transfer integrals and hence much improved charge transport, and reduced energetic disorders in CH17blends. More importantly, the observed upshifted charge transfer(CT) state of CH17 blends compared with that of Y6, due to its increased molecular conjugation extension in both directions, further enhances the hybridization between its CT and local exciton(LE) states, resulting in higher luminescence efficiency, much suppressed non-radiative recombination loss and smaller Elosswith respect to that of Y6. Consequently, an excellent PCE of 17.84% is achieved with PM6 as the donor in a binary device compared with a PCE of 16.27% for the controlled Y6 device. Furthermore, a further improved PCE of 18.13% is achieved by CH17-based ternary single-junction OSCs along with a markedly reduced Elossof 0.49 e V and larger open-circuit voltage(

关键词： organic solar cells A-D-A electron acceptor reduced Eloss central unit multiple conjugation extension molecular packing

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Chiral Dirac Fermion in a Collinear Antiferromagnet

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Chinese Physics Letters 2023年第12期40卷 84-91页

作者：张奥邓可盛洁明刘鹏飞 Shiv Kumar Kenya Shimada 江志诚刘正太沈大伟李嘉裕任俊王乐周良 Yoshihisa Ishikawa Takashi Ohhara Qiang Zhang Garry McIntyre Dehong Yu 刘恩克吴留锁陈朝宇刘奇航 Shenzhen Institute for Quantum Science and Technology and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Hiroshima Synchrotron Radiation Centre Hiroshima UniversityHigashi-HiroshimaHiroshima 739-0046Japan State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Neutron Science and Technology Center Comprehensive Research Organization for Science and SocietyTokaiIbaraki 319-1106Japan Neutron Science Section J-PARC CenterJapan Atomic Energy AgencyIbaraki 319-1195Japan Neutron Science Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Australian Nuclear Science and Technology Organisation Locked bag 2001Kirrawee DCNew South Wales 2232Australia State Key Laboratory for Magnetism Institute of PhysicsChinese Academy of SciencesBeijing 100190China

In a Dirac semimetal, the massless Dirac fermion has zero chirality, leading to surface states connected adiabatically to a topologically trivial surface state as well as vanishing anomalous Hall effect. Recently, it is predicted that in the nonrelativistic limit of certain collinear antiferromagnets, there exists a type of chiral“Dirac-like” fermion, whose dispersion manifests four-fold degenerate crossing points formed by spin-degenerate linear bands, with topologically protected Fermi arcs. Such an unconventional chiral fermion, protected by a hidden SU(2) symmetry in the hierarchy of an enhanced crystallographic group, namely spin space group, is not experimentally verified yet. Here, by angle-resolved photoemission spectroscopy measurements, we reveal the surface origin of the electron pocket at the Fermi surface in collinear antiferromagnet CoNb3S6. Combining with neutron diffraction and first-principles calculations, we suggest a multidomain collinear antiferromagnetic configuration, rendering the the existence of the Fermi-arc surface states induced by chiral Dirac-like *** work provides spectral evidence of the chiral Dirac-like fermion caused by particular spin symmetry in CoNb_(3)S_(6), paving an avenue for exploring new emergent phenomena in antiferromagnets with unconventional quasiparticle excitations.

关键词： Fermi Dirac chiral

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Harnessing electron spins with carbon materials for quantum information applications

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National science Open 2023年第1期2卷 1-4页

作者： Hu Chen Ye-Xin Wang Shanshan Wang Weiguo Mao Song Gao Shang-Da Jiang Shen Zhou Institute for Quantum Science and Technology College of ScienceScience and Technology on Advanced Ceramic Fibers and Composites LaboratoryNational University of Defense TechnologyChangsha 410073China College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114China Spin-X Institute School of Chemistry and Chemical EngineeringState Key Laboratory of Luminescent Materials and DevicesGuangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsSouth China University of TechnologyGuangzhou 510641China Beijing National Laboratory of Molecular Science Beijing Key Laboratory of Magnetoelectric Materials and DevicesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The implementation of information technology relies on functional chemicals and *** have led to the rise of the electronic information *** the next generation of information technology,how to implement quantum information processing has become an urgent task[1].In order to carry superposition state and entanglement,systems,which are better isolated from environment,are designed to boost the quantum coherence *** example,superconducting circuits,which are the leading candidate of quantum processor,uses the transmon design and the mK temperature condition to reduce the influence of environmental noise.

关键词： materials. quantum superposition

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Direct ink writing of conductive materials for emerging energy storage systems

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Nano Research 2022年第7期15卷 6091-6111页

作者： Ting Huang Wenfeng Liu Chenliang Su Ya-yun Li Jingyu Sun College of Materials Science and Engineering Shenzhen Key Laboratory of Special Functional Materials&Shenzhen Engineering Laboratory for Advance Technology of CeramicsShenzhen UniversityShenzhen 518060China College of Energy Soochow Institute for Energy and Materials InnovationsJiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow UniversitySuzhou 215006China Institute of Microscale Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronic Science&Technology of Ministry of EducationShenzhen UniversityShenzhen 518060China

Direct ink writing(DIW)has recently emerged as an appealing method for designing and fabricating three-dimensional(3D)*** 3D structures can be built layer-by-layer via digitally controlled extrusion and deposition of aqueous-based colloidal *** formulation of well-dispersed suspensions with specific rheological behaviors is a prerequisite for the use of this *** this review article,the fundamental concepts of DIW are presented,including the operation principles and basic *** strategies used for ink formulation are discussed with a focus on the most widely used electrode materials,including graphene,Mxenes,and carbon *** recent progress in printing design of emerging energy storage systems,encompassing rechargeable batteries,supercapacitors,and hybrid capacitors,is *** and future perspectives are also covered to provide guidance for the future development of DIW.

关键词： direct ink writing energy storage ink formulation conductive materials structure-performance relationship

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Mechanisms Governing Crack Speed in Peridynamic Model

SSRN

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SSRN 2024年

作者： Zhang, Mengnan Chen, Shuyu Ji, Jiale Cui, Kunpeng Tian, Fucheng Li, Liangbin National Synchrotron Radiation Laboratory Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film CAS Key Laboratory of Soft Matter Chemistry University of Science and Technology of China Hefei230026 China Department of Polymer Science and Engineering Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film University of Science and Technology of China Hefei230026 China

Peridynamic, an innovative solid mechanics method in continuum theory, offers unique advantages for discontinuity modeling such as fracture simulation. This study addressed a puzzling phenomenon observed in peridynamic dynamic fracture modeling, where the predicted normalized limiting crack velocity remained nearly constant across different material parameters input. Delving into the mechanism influencing predicted crack velocity in peridynamic model, we systematically explored the impacts of stiffness distribution of the nonlocal region around the crack tip, through numerical simulations and theoretical analyses. Additionally, the implicit wave velocity degradation in the damage zone of the peridynamic model was uncovered. A prediction formula for the limiting crack velocity was then derived based on these analyses. Furthermore, the wave velocity degradation scheme and the proposed prediction model were validated through numerical instances, involving convergence studies and material density degradation investigation. This work contributes to a further understanding of the peridynamic model and provides new insights for crack velocity prediction in dynamic fracture scenarios. © 2024, The Authors. All rights reserved.

关键词： Crack tips

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A macrocycle-based“Russian doll”:The smallest cucurbituril in cucurbituril

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Chinese Chemical Letters 2024年第12期35卷 169-173页

作者： Yu Xia Yangming Jiang Xin-Long Ni Qiaochun Wang Daoping Wang State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical UniversityGuiyang 550014China Natural Products Research Center of Guizhou Province Guiyang 550014China Key Laboratory of Chemical Biology and Traditional Chinese Medicine Ministry of Educational of ChinaKey Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan ProvinceHunan Normal UniversityChangsha 410081China Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry&Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China

Host-guest recognition-based macrocycle in macrocycle to form"Russian doll"assemblies remains an interesting topic in supramolecular ***,a macrocycle-in-macrocycle assembly was studied using cucurbit[10]uril(Q[10])and the smallest cucurbituril-like macrocycle(TD[4]).X-ray crystal structure analysis revealed that TD[4]was encapsulated in the cavity of Q[10]to form a 1:1 ***,competitive guest studies suggested that TD[4]had the highest binding constant with the Q[10]host among the guests used,including Q[5],Me_(8)TD[4],and amantadine molecules in *** results provided a new cucurbituril-based Russian-doll structure containing both the largest and smallest cavities of the cucurbiturils,which expanded the family of molecular Russian dolls.

关键词： Cucurbit[10]uril Cucurbit[4]uril Host-guest recognition X-ray structure Macrocycle in macrocycle

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In-Situ Assembly of Polypyrrole Onto Heterocyclic Aramid for High-Strength, Ultratough, Durable, and Multifunctional Films

SSRN

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SSRN 2024年

作者： Xiong, Jinhua Zhao, Xu Li, Pengyang Lian, Huanxin Yan, Qian Chen, He Liu, Zonglin Chen, Zhong Peng, Qingyu He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China

High-strength, ultratough, multifunctional polymer-based electromagnetic interference (EMI) shielding nanocomposite films have colossal application potential in artificial intelligence, 5G communications, and flexible electronics. In this work, a large-scale, high-strength, and ultratough heterocyclic aramid@polypyrrole (HA@PPy) composite film is developed via the in-situ loading of PPy onto the HA template. The synthesized films achieve remarkable mechanical properties and high electronic conductivity by using the template effect of HA to guide the assembly of conductive polymers. When the content of PPy is 45 wt.%, the HA@PPy (HP45) film possesses excellent tensile strength (240.3 MPa), significant elongation at break (25.9%), outstanding toughness (53.1 MJ m-3), and exceptional folding durability owing to strong hydrogen bond interaction between PPy and HA. Furthermore, thanks to the highly connected conductive paths formed by PPy, the HP45 film exhibits satisfactory EMI shielding effectiveness (EMI SE) of 45.5 dB and specific EMI SE of 14691.6 dB cm2 g-1 at an ultra-thin thickness (26.3 μm). The HP45 film also demonstrates excellent electromagnetic protection, electro-/photothermal deicing, thermal therapy, and flame retardancy applications. Therefore, high-performance and multifunctional HA@PPy films have substantial potential for widespread application in EMI shielding and thermal management. © 2024, The Authors. All rights reserved.

关键词： Nanocomposite films

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Synchrotron Radiation X-ray Scattering Approaching Real Industrial Processing of Polymer

Polymer Science & Technology

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Polymer science & technology 2025年第3期1卷 155-170页

作者： Wenyi Li Wancheng Yu Jianhe Zhu Menglan Qiao Hang Guo Xiuhong Li Kunpeng Cui Liangbin Li National Synchrotron Radiation Laboratory Anhui Provincial Engineering Research Center for Advanced Functional Polymer Films University of Science and Technology of China Hefei 230029 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China Department of Polymer Science and Engineering State Key Laboratory of Precision and Intelligent Chemistry Anhui Provincial Engineering Research Center for Advanced Functional Polymer Films University of Science and Technology of China Hefei Anhui 230026 China

Synchrotron radiation X-ray scattering techniques have become powerful tools for multi-scale structural characterization, making significant contributions to polymer research. Recent advancements in these techniques have made it possible to conductin-situexperiments during polymer processing. In this review, we examine the foundational developments in the application of synchrotron radiation X-ray scattering toin-situpolymer processing experiments. We focus on the design of specializedin-situinstruments tailored for various processing methods and discuss their associated experimental outcomes. Finally, we highlight future challenges and key issues that require attention. We hope that our insights will inspire further discussion and exploration among researchers in this field.

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Engineering Nitrogen Vacancies and Cyano Groups into C3n4 Nanosheets for Highly Efficient Photocatalytic H2o2 Production

SSRN

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SSRN 2024年

作者： Ba, Guiming Hu, Huilin Bi, Fuhong Yu, Junbo Liu, Enzuo Ye, Jinhua Wang, Defa TJU-NIMS International Collaboration Laboratory Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin Key Laboratory of Composite and Functional Materials School of Material Science and Engineering Tianjin University Tianjin300072 China Ibaraki Tsukuba305-0044 Japan

Thermal oxidation of bulky carbon nitride (C3N4, CN) to expose more active sites is an important method to improve the activity of the as-prepared CN nanosheets. Unfortunately, the yield of thermal oxidation is low. Herein, we report dual-deficient CN (DDCN) ultrathin nanosheets engineered with nitrogen vacancies and cyano groups by two-step bottom-up thermal polymerization of belt-like melamine with a high yield of 65%. Featured with abundant exposed active sites, short charge migration distance, wide visible-light absorption, quick charge separation/transfer, enhanced oxygen adsorption ability and 2e‒ oxygen reduction reaction selectivity, the DDCN exhibits a high H2O2 production rate of ~1031 μmol g‒1 h‒1, which is 19.5 times that of CN (53 μmol g‒1 h‒1) under visible light irradiation (l ≥ 420 nm). Specifically, the apparent quantum yield (AQY) of DDCN reached 10.7% at 420 nm. This study provides a facile dual-defect engineering method to develop highly efficient ultrathin CN-based photocatalysts. © 2024, The Authors. All rights reserved.

关键词： Carbon nitride

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