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Machine learning assisted prediction of dielectric temperature spectrum of ferroelectrics

Journal of Advanced Ceramics 2023年第9期12卷 1793-1804页

作者： Jingjin He Changxin Wang Junjie Li Chuanbao Liu Dezhen Xue Jiangli Cao Yanjing Su Lijie Qiao Turab Lookman Yang Bai Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Institute for Advanced Material and Technology University of Science and Technology BeijingBeijing 100083China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China School of Materials Science and Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China AiMaterials Research LLC Santa FeNM 87501USA

In material science and engineering,obtaining a spectrum from a measurement is often time-consuming and its accurate prediction using data mining can also be *** this work,we propose a machine learning strategy based on a deep neural network model to accurately predict the dielectric temperature spectrum for a typical multi-component ferroelectric system,i.e.,(Ba_(1−x−y)Ca_(x)Sr_(y))(Ti_(1−u−v−w)Zr_(u)Sn_(v)Hf_(w))O_(3).The deep neural network model uses physical features as inputs and directly outputs the full spectrum,in addition to yielding the octahedral factor,Matyonov–Batsanov electronegativity,ratio of valence electron to nuclear charge,and core electron distance(Schubert)as four key *** to the physically meaningful features,our model exhibits better performance and generalization ability in the broader composition space of BaTiO3-based solid *** the prediction accuracy is superior to traditional machine learning models that predict dielectric permittivity values at each ***,the transition temperature and the degree of dispersion of the ferroelectric phase transition are easily extracted from the predicted spectra to provide richer physical *** prediction is also experimentally validated by typical samples of(Ba_(0.85)Ca_(0.15))(Ti_(0.98–x)Zr_(x)Hf_(0.02))O_(3).This work provides insights for accelerating spectra predictions and extracting ferroelectric phase transition information.

关键词： machine learning(ML) dielectric temperature spectrum ferroelectrics phase transition information

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Mechano-Responsive and Acid Stimuli-Responsive Luminescence of a Hydrogen-Bonded Organic Frameworks

SSRN

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SSRN 2024年

作者： Xu, Hui Zhang, Wei Shen, Penglei Bai, Gongxun Xu, Shiqing Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and Devices Collage of Optical and Electronic Technology China Jiliang University Hangzhou310018 China

Stimuli-responsive materials are capable of changing their chemical or physical properties when exposed to external stimuli, showing a wide range of potential applications such as drug delivery, sensing, smart coatings, and artificial muscles. Here, a micron-sized hydrogen-bonded organic framework PFC-1 was constructed and its mechanical and acid stimuli-responsive luminescence were investigated. It was found that the fluorescence of PFC-1 aqueous suspension is affected HCl concentrations. The pristine PFC-1 aqueous suspension exhibits an emission peak with high fluorescence intensity at 440 nm and two weak emission shoulders at 475 nm and 535 nm, respectively. Upon the addition of hydrochloric acid, there is a gradual reduction in the peak intensities at 440 nm and 475 nm, while the peak intensity at 535 nm remains relatively unchanged, resulting in a progressive shift in fluorescence color from blue to green. Mechanical grinding induces approximate 30 nm blue-shift in the fluorescence emission peak, a change that is reversible upon immersing the powder in ethanol for 60 minutes. This work contributes to the development of stimuli-responsive hydrogen-bonded organic framework materials with potential applications in acid and pressure fluorescence sensing. © 2024, The Authors. All rights reserved.

关键词： Hydrogen

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Optimizing the morphology of all-polymer solar cells for enhanced photovoltaic performance and thermal stability

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Journal of Semiconductors 2023年第5期44卷 34-41页

作者： Kang An Wenkai Zhong Chunguang Zhu Feng Peng Lei Xu Zhiwei Lin Lei Wang Cheng Zhou Lei Ying Ning Li Fei Huang Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou 510640China Frontiers Science Center for Transformative Molecules Center of Hydrogen Scienceand School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China South China Institute of Collaborative Innovation Dongguan 523808China South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou 510640China School of Light Industry and Engineering&State Key Laboratory of Pulp&Paper Engineering South China University of TechnologyGuangzhou 510640China

Due to the complicated film formation kinetics, morphology control remains a major challenge for the development of efficient and stable all-polymer solar cells(all-PSCs). To overcome this obstacle, the sequential deposition method is used to fabricate the photoactive layers of all-PSCs comprising a polymer donor PTzBI-oF and a polymer acceptor PS1. The film morphology can be manipulated by incorporating amounts of a dibenzyl ether additive into the PS1 layer. Detailed morphology investigations by grazing incidence wide-angle X-ray scattering and a transmission electron microscope reveal that the combination merits of sequential deposition and DBE additive can render favorable crystalline properties as well as phase separation for PTzBI-oF:PS1 blends. Consequently, the optimized all-PSCs delivered an enhanced power conversion efficiency(PCE) of 15.21%along with improved carrier extraction and suppressed charge recombination. More importantly, the optimized all-PSCs remain over 90% of their initial PCEs under continuous thermal stress at 65 °C for over 500 h. This work validates that control over microstructure morphology via a sequential deposition process is a promising strategy for fabricating highly efficient and stable all-PSCs.

关键词： morphology all-polymer solar cells thermal stability sequential deposition

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Classification of Multisource Remote Sensing Data Using Slice Mamba

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IEEE Transactions on Geoscience and Remote Sensing 2025年 63卷

作者： He, Yan Tu, Bing Jiang, Puzhao Liu, Bo Li, Jun Plaza, Antonio Institute of Optics and Electronics Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean Jiangsu International Joint Laboratory on Meteorological Photonics and Optoelectronic Detection Nanjing University of Information Science and Technology Jiangsu Nanjing210044 China Faculty of Computer Science Wuhan430074 China University of Extremadura Hyperspectral Computing Laboratory Department of Technology of Computers and Communications Escuela Politecnica Cáceres10003 Spain

The multisource remote sensing (RS) data have yielded promising results in target detection and classification tasks. However, most existing methods primarily focus on the spatial features inherent in spectral information, while the continuous spectral characteristics are generally neglected. This oversight leads to insufficient extraction of spectral information, thereby limiting detection performance. Recently, the Mamba architecture, based on state space models (SSMs), integrates the advantages of long-range sequence modeling and linear computational efficiency, demonstrating significant potential in low-dimensional scenarios. Inspired by this, we propose Slice Mamba for multisource RS data fusion classification. Specifically, we design two scanning methods: lateral slice scanning (LatSS) and longitudinal slice scanning (LonSS), which construct sequences from lateral and longitudinal perspectives to facilitate information interaction between pixels. In conjunction with the Mamba architecture, we develop the lateral slice Mamba block (LatSMB) and the longitudinal slice Mamba block (LonSMB) to capture continuous spatial-spectral features. Based on this, we establish the slice feature extraction (SFE) module for extracting spatial-spectral feature information and design the cross-information fusion (CIF) module to form a complementary structure for effectively modeling spatial-spectral features, thereby achieving the fusion and classification of multisource heterogeneous features. Experimental results on three benchmark datasets demonstrate that Slice Mamba outperforms existing advanced methods in fusion classification performance and exhibits greater robustness when applied to multispectral datasets. © 2025 IEEE.

关键词： Information fusion

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Distributed Wireless Radar System with Application to Through the Wall Radar

Distributed Wireless Radar System with Application to Throug...

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IET International Radar Conference 2023, IRC 2023

作者： Mu, Yaxin Liu, Xin Ye, Shengbo Zhu, Haibin School of Information and Communication Engineering Beijing Information Science and Technology University Beijing100101 China Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing100101 China State Key Laboratory of Space-Ground Integrated Information Technology Beijing Institute of Satellite Information Engineering Beijing100095 China Key Laboratory of Electromagnetic Radiation and Detection Technology Aerospace Information Research Institute Chinese Academy of Sciences Beijing100190 China

ISBN: (纸本)9781839539954

Nowadays, distributed radar network system has become a hot research issue because its performance is superior to monostatic radar in target positioning accuracy, detection probability, detection range. The distributed radar network is made up of N(N>=2) active radar nodes, and each radar has its own clock, therefore, time synchronization is important issue for cooperative detection. In this paper, we have developed a distributed wireless radar network, which is a portable prototype composed of three pseudo-random coded radars (N=3). The processing flow of distributed wireless radar data is introduced for the positioning and tracking of the target inside the wall. A wireless radar signal time synchronization scheme is proposed, the fast time synchronization is based on the arrival time of the direct coupled wave of the antenna, and the slow time synchronization is based on the state matching of a moving target, a template matching algorithm is used to estimate the time bias. Based on the multi-station radar data, Levenberg-Marquardt algorithm is applied to determine the location the target, and the Kalman filter algorithm is used to track the moving target. © The Institution of Engineering & technology 2023.

关键词： Template matching

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Force-driven moisture-mediated CsPbBr_(3)nanocrystallization from amorphous glass

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Science China Materials 2024年第10期67卷 3106-3114页

作者： Peng Gao Hang Lin Pengfei Wang Ming Liu Ju Xu Yao Cheng Yuansheng Wang State Key Laboratory of Structural Chemistry Key Laboratory of Optoelectronic Materials Chemistry and PhysicsKey Lab Design&Assembly Funct NanostructFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

While the“amorphous to crystalline”transformation process,which has significant potential for application,has been widely studied,the microscopic mechanism on the nanometer scale is not fully *** contrast to common heat-driven phase transformations,the present study demonstrated the force-driven moisture-mediated nanocrystallization of perovskite CsPbBr_(3)precipitated from a glass *** the present case,the breakage of the glass network under shearing force produces high-energy sites to absorb H2O molecules/clusters from ambient moisture,and the hydration process promotes the crystallization *** analysis combined with confocal laser scanning microscopy revealed that the distribution of CsPbBr_(3)nanocrystals almost reproduced that of the localized stress field and clearly reflected the crack propagation *** potential applications of perovskite glass in the optical sensing of force and moisture are also *** findings provide insight into crystal nucleation/growth in glass,as well as understanding the dynamics of crack propagation during the brittle fracture process.

关键词： luminescence glass ceramic crystallization optical materials optical sensing CsPbBr_(3) perovskite

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Advanced carbon nitride-based single-atomphotocatalysts

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SusMat 2024年第5期4卷 70-113页

作者： Zifan Zhang Kun Xiang Haitao Wang Xin Li Jing Zou Guijie Liang Jizhou Jiang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhanChina Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhouChina Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and ScienceXiangyangChina

Single-atom catalysts(SACs)have rapidly become a hot topic in photocatalytic research due to their unique physical and chemical properties,high activity,and high *** many semiconductor carriers,the special structure of carbon nitride(C3N4)perfectly meets the substrate requirements for stabi-lizing SACs;they can also compensate for the photocatalytic defects of C3N4 materials by modifying energy bands and electronic ***,devel-oping advanced C3N4-based SACs is of great *** this review,we focus on elucidating efficient preparation strategies and the burgeoning photo-catalytic applications of C3N4-based *** also outline prospective strategies for enhancing the performance of SACs and C3N4-based SACs in the future.A comprehensive array of methodologies is presented for identifying and char-acterizing C3N4-based *** includes an exploration of potential atomic catalytic mechanisms through the simulation and regulation of atomic catalytic behaviors and the synergistic effects of single or multiple ***,a forward-looking perspective is adopted to contemplate the future prospects and challenges associated with C3N4-based *** encompasses considerations,such as atomic loading,regulatory design,and the integration of machine learn-ing *** is anticipated that this review will stimulate novel insights into the synthesis of high-load and durable SACs,thereby providing theoretical groundwork for scalable and controllable applications in the field.

关键词： atomic catalytic mechanism carbon nitride improvement strategies photocatalytic applications single-atom catalysts

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Replacing alkyl side chain of non-fullerene acceptor with siloxane-terminated side chain enables lower surface energy towards optimizing bulk-heterojunction morphology and high photovoltaic performance

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Science China Chemistry 2021年第7期64卷 1208-1218页

作者： Rihang Qiu Zhuhao Wu Suhan Li Haiying Jiang Qian Wang Yinchu Chen Xuanchen Liu Lianjie Zhang Junwu Chen State Key Laboratory of Luminescent Materials&Devices Institute of Polymer Optoelectronic Materials&DevicesGuangzhou 510640China South China University of Technology South China Institute of Collaborative InnovationDongguan 523808China

Towards a good control of the morphology of bulk-heterojunction(BHJ)active layers for polymer solar cells(PSCs),selecting an appropriate side chain for a polymer donor and a nonfullerene acceptor(NFA)is very *** this work,two novel NFAs i-IE-4F and i-IESi-4 F comprising alkyl and siloxane-terminated side chains on the central indacenodithiophene(IDT)core,respectively,were *** the siloxane-terminated side chain to i-IESi-4 F affords surface energy(γ)of33.32 mN/m,much lower than that of 39.83 mN/m for i-IE-4F,supplying a big chance to tune miscibility with a polymer *** fluorobenzotriazole-based polymer donors J52 and PBZ-2Si bearing alkyl and siloxane-terminated side chains,respectively,showγvalues of 36.08 and 33.10 mN/m,*** estimated Flory-Huggins interaction parameters(χD,A)indicate that the i-IESi-4 F is more miscible than i-IE-4F in pairing with J52 or *** resulting i-IESi-4 F-based blend film exhibits low film roughness and accompanies obviously improved BHJ *** PSCs,the J52:i-IESi-4F and PBZ-2Si:i-IESi-4 F active layers display power conversion efficiencies(PCEs)of 12.67%and 14.54%,respectively,all remarkably higher than PCEs≤7.34%of the i-IE-4F-based active ***,the PBZ-2Si:i-IESi-4 F active layer,a donor:acceptor blend system comprising siloxane-terminated side chains(DSi:ASimatching)with the highest BHJ miscibility due to the combinatory effect of the side chains,shows the highest efficiency,as supported by efficient exciton dissociation,the lowest bimolecular recombination,and the optimal charge *** results demonstrate that attaching siloxane-terminated side chains to NFAs,as a side chain engineering,has big potential in lowering their surface energy towards fine control of BHJ morphology and leading to a better donor:acceptor blend system.

关键词： terminated acceptor donor

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Metal to insulator transition for conducting polymers in plasmonic nanogaps

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Light(Science & Applications) 2024年第1期13卷 23-32页

作者： Yuling Xiong Rohit Chikkaraddy Charlie Readman Shu Hu Kunli Xiong Jialong Peng Qianqi Lin Jeremy J.Baumberg NanoPhotonics Centre Cavendish LaboratoryDepartment of PhysicsUniversity of CambridgeCambridgeCB30HEUK School of Physics&Astronomy University of BirminghamEdgbastonBirminghamUK College of Advanced Interdisciplinary Studies and Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaChina Hybrid Materials for Opto-Electronics Group Department of Molecules and MaterialsMESA+Institute for NanotechnologyMolecules Center and Center for Brain-Inspired Nano SystemsFaculty of Science and TechnologyUniversity of TwenteEnschedeNetherlands

Conjugated polymers are promising material candidates for many future applications in flexible displays, organic circuits, and sensors. Their performance is strongly affected by their structural conformation including both electrical and optical anisotropy. Particularly for thin layers or close to crucial interfaces, there are few methods to track their organization and functional behaviors. Here we present a platform based on plasmonic nanogaps that can assess the chemical structure and orientation of conjugated polymers down to sub-10 nm thickness using light. We focus on a representative conjugated polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), of varying thickness (2-20 nm) while it undergoes redox in situ. This allows dynamic switching of the plasmonic gap spacer through a metal-insulator transition. Both dark-field (DF) and surface-enhanced Raman scattering (SERS) spectra track the optical anisotropy and orientation of polymer chains close to a metallic interface. Moreover, we demonstrate how this influences both optical and redox switching for nanothick PEDOT devices.

关键词： transition insulator conjugated

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A universal hydrochloric acid-assistant powder-to-powder strategy for quick and mass preparation of lead-free perovskite microcrystals

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Light(Science & Applications) 2023年第4期12卷 613-624页

作者： Huanxin Yang Xiangxiang Chen Yiyue Chu Changjiu Sun Haolin Lu Mingjian Yuan Yuhai Zhang Guankui Long Libing Zhang Xiyan Li Institute of Photoelectronic Thin Film Devices and Technology Solar Energy Conversion CenterNankai UniversityTianjin 300350China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Nankai UniversityTianjin 300350China Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Nankai UniversityTianjin 300350China Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong Institute for Advanced Interdisciplinary Research(IAIR)University of JinanJinan 250022 ShandongChina Tianjin Key Laboratory of Molecular Optoelectronic Department of ChemistryTianjin UniversityTianjin 300354China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071China Schoolof Materials Science and Engineering Nankai UniversityTianjin 300350China

Lead-free halide perovskite materials possess low toxicity,broadband luminescence and robust stability compared with conventional lead-based perovskites,thus holding great promise for eyes-friendly white light ***,the traditionally used preparation methods with a long period and limited product yield have curtailed the commercialization of these *** we introduce a universal hydrochloric acid-assistant powder-to-powder strategy which can accomplish the goals of thermal-,pressure-free,eco-friendliness,short time,low cost and high product yield,*** obtained Cs_(2)Na_(0.9)Ag_(0.1)In_(0.95)Bi_(0.05)Cl_(6)microcrystals exhibit bright self-trapped excitons emission with quantum yield of(98.3±3.8)%,which could retain(90.5±1.3)%and(96.8±0.8)%after continuous heating or ultraviolet-irradiation for 1000 h,*** phosphor converted-LED exhibited near-unity conversion efficiency from ultraviolet chip to self-trapped excitons emission at~200 *** ions doping(such as Cs_(2)Na_(0.9)Ag_(0.1)InCl_(6):Ln^(3+))and other derived lead-free perovskite materials(such as Cs_(2)ZrCl_(6)and Cs_(4)MnBi_(2)Cl_(12))with high luminous performance are all realized by our proposed strategy,which has shown excellent availability towards commercialization.

关键词： perovskite preparation hydrochloric

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