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Perovskite films for X-ray detection

Journal of Semiconductors 2022年第7期43卷 4-7页

作者： Pei Yuan Lixiu Zhang Menghua Zhu Liming Ding State Key Laboratory of Solidification Processing Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

X-ray detection is widely used in research[1−3],product in-spection[4],nuclear station,and medical ***[5],α-Se[6],PbI2[7],and CdZnTe[8]are conventional semiconductors,and some problems limit their *** instance,Si andα-Se have low stopping power for X-ray[8],which hinders their application in high-energy range over 50 ***,the complicated preparation,high operating voltage,and high fab-rication cost of these materials are the negative issues.

关键词： PbI2 instance hinder

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Optical tunable differentiator based on microring resonator assisted by low-loss superlattice phase change material 2

Optical tunable differentiator based on microring resonator ...

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2nd International Conference on Optical Communication and Optical Information Processing, OCOIP 2024

作者： Wu, Ziqi Dong, Yida Zhong, Wentao Shen, Mei Lei, Lei Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen518060 China 518060 China College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Academy for Advanced Interdisciplinary Studies Department of Materials Science and Engineering Southern University of Science and Technology Shenzhen518000 China

ISBN: (数字)9781510688995

ISBN: (纸本)9781510688988

This paper presents a novel microring resonator (MRR)-based all-optical tunable temporal differentiator. By modulating the crystallinity of the ZnS-SiO2/Ge2Sb2Te5 (GST-SL) phase change material (PCM), the coupling regime of the MRR can be precisely adjusted, achieving a differentiation order (α) range of 0.7-1.3. Experimental validation with non-return-to-zero (NRZ) and return-to-zero (RZ) signal types demonstrates a strong alignment with theoretical models, maintaining an error margin below 7.3%, which confirms the device's high adjustability and stability. The proposed tuning mechanism enables low-energy, high-speed optical control of MRR states, contributing to optimized chip area and power consumption. Supported by the unique characteristics of the superlattice structure, this all-optical tunable differentiator offers promising potential for large-scale AI-driven photonic integrated circuits, particularly in applications such as optical analog computing, optical image processing, and optical neural networks. © 2025 SPIE.

关键词： Photonic integrated circuits

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Effect of deep neural network structure on the accuracy of NIR fluorescence molecular tomography reconstruction 6

Effect of deep neural network structure on the accuracy of N...

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Advanced Optical Imaging Technologies VI 2023

作者： Wang, Huiquan Liu, Yuqing Feng, Tianzi Gao, Jianyu Zhao, Zhe Han, Guang Wang, Jinhai Miao, Jinghong School of Life Sciences Tiangong University Tianjin300387 China School of Electronic and Information Engineering Tiangong University Tianjin300387 China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin300387 China

ISBN: (纸本)9781510667815

To overcome the ill-conditioning of the NIR fluorescence molecular tomography (FMT) inverse problem, neural networks are commonly used for reconstruction to improve the accuracy and reliability of imaging. This paper aims to investigate the impact of different neural network structures on the reconstruction performance of FMT for improved effect. In this study, the finite element solution of the Laplace-transformed time-domain coupled diffusion equation serves as the forward model for FMT, an improved stacked autoencoder (SAE) network is used and applied to FMT reconstruction. In the study, the SAE was set as a four layers network model structure, of which two layers were used for the hidden layer of the network. When the number of neurons in hidden layer 1 is smaller than hidden layer 2, the network is referred to as a decreasing network structure, and vice versa for an increasing network structure. The input data to the network consists of surface fluorescence intensity values collected by detectors around the heterogeneity. The output data of the network consists of fluorescence intensity values on partitioned nodes obtained through finite element method (FEM) partitioning. The experimental results demonstrate that the increasing network structure exhibits better imaging accuracy, fewer artifacts, and a more stable network model in FMT reconstruction. Through this study of the impact of SAE network architecture on FMT reconstruction, we have identified the optimal network model, which holds significant guidance for the application of neural networks in the field of FMT. © 2023 SPIE.

关键词： Inverse problems

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Quantum control for time-dependent noise by inverse geometric optimization

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 51-57页

作者： Xiaodong Yang Yingcheng Li Ran Liu Xinfang Nie Tao Xin Dawei Lu Jun Li Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Surface Physics Department of PhysicsCenter for Field Theory and Particle Physicsand Institute for Nanoelectronic Devices and Quantum ComputingFudan UniversityShanghai 200433China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

Quantum systems are exceedingly difficult to engineer because they are sensitive to various types of *** particular,timedependent noises are frequently encountered in experiments but how to overcome them remains a challenging *** this work,we propose a flexible robust control technique to resist time-dependent noises based on inverse geometric optimization working in the filter-function *** basic idea is to parameterize the control filter function geometrically and minimize its overlap with the noise spectral *** then effectively reduces the noise susceptibility of the controlled system *** show that the proposed method can produce high-quality robust pulses for realizing desired quantum evolutions under realistic noise ***,we demonstrate this method in examples including dynamical decoupling and quantum sensing protocols to enhance their performances.

关键词： time-dependent noise robust control quantum gates and states dynamical decoupling quantum sensing

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Promoting the Na^(+)-storage of NiCo_(2)S_(4) hollow nanospheres by surfacing Ni-B nanoflakes

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Journal of Materials Science & technology 2021年第23期82卷 114-121页

作者： Jingfa Li Jian Zhou Qihao Zhou Xin Wang Cong Guo Min Li School of Chemistry and Materials Science Nanjing University of Information Science and TechnologyNanjing210044JiangsuChina Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjing210044JiangsuChina

Sodium ion battery(SIB)is considered as the potential alternative for next generation energy system to succeed the lithium ion battery(LIB)due to the low price and vast abundance of Na *** metal sulfide is identified as an impo rtant redox conversion type of negative electrode for *** this study,amorphous nickel boride(Ni-B)nanoflakes are introduced into the hollow Ni-Co sulfide nanospheres by a facile in situ solution growth route to promote the electrochemical performance of Na^(+)-*** measurements demonstrate that the Ni-B component could effectively improve the redox kinetics of the conversion reaction and structural stability during long-term Na^(+)insertion/*** example,the NiCo_(2)S_(4)@Ni-B composites display a high reversible capacity of 251.9 mA h g^(-1)at the current density of 1.0 A g^(-1)after 200 cycles,much higher than that of bare NiCo_(2)S_(4)(37.4 mA h g^(-1)at 1.0 A g^(-1)after 200 cycles).As a consequence,these results demonstrate a new sight to explore heterostructures of mixed metal-sulfides electrode materials with superior Na^(+)-storage performances.

关键词： Surface growth Ternary metal sulfides Redox kinetics Sodium ion battery

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A chitosan/amido-graphene oxide-based self-powered humidity sensor enabled by triboelectric effect

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Rare Metals 2021年第8期40卷 1995-2003页

作者： Bo-Hao Liu Guang-Zhong Xie Cheng-Zhen Li Si Wang Zhen Yuan Zai-Hua Duan Ya-Dong Jiang Hui-Ling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu610054China

In this work,amido-graphene oxide(GO-NH_(2))loaded chitosan(CTS)composite material(CTS/GO-NH_(2))that acts as both the triboelectric and sensing film was prepared on rotary fan-shaped triboelectric nanogenerator for humidity *** with the pristine CTSbased triboelectric humidity sensor(CTS-THS)and GONH_(2)-THS,the CTS/GO-NH_(2)-based humidity sensor exhibited higher humidity response and better linearity in the relative humidity(RH)range of 18.7%RH-91.5%*** above results can be explained by the massive exposed and less concealed hydrophilic functional groups of CTS with the help of the wrinkle structure of GO-NH_(2).Meanwhile,the CTS/GO-NH_(2)-THS possessed good repeatability and acceptable hysteresis(~6.2%RH).Finally,a humidity sensing mechanism coupling triboelectric contact charging effect with electrons transfer principle under moisture environment was established to interpret the enhanced humidity sensing performance of the composite film-based *** work demonstrates that CTS/GONH_(2) composite film can be utilized to fabricate humidity sensors based on the triboelectric effect.

关键词： Chitosan Amido-graphene oxide Triboelectric nanogenerator Humidity sensors Hydrogen bonding interaction

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Enhanced positive humidity sensitive behavior of p-reduced graphene oxide decorated with n-WS_(2) nanoparticles

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Rare Metals 2021年第7期40卷 1762-1767页

作者： Zai-Hua Duan Qiu-Ni Zhao Cheng-Zhen Li Si Wang Ya-Dong Jiang Ya-Jie Zhang Bo-Hao Liu Hui-Ling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Most resistance-type humidity sensors exhibit negative humidity sensitivity,i.e.,their resistance decreases with a corresponding increase in *** is primarily attributed to the dominant role of ionic conduction in adsorbed *** this work,a humidity sensor based on a p-type reduced graphene oxide(p-rGO)with positive humidity sensitivity is ***,its positive humidity sensing response is further enhanced by n-type WS_(2) nanoparticles *** results show that both rGO and r GO/WS_(2) humidity sensors have good linear response in the relative humidity(RH)range of0%-91.5%.The sensitivity of the rGO/WS_(2) humidity sensor is 1.87 times that of rGO humidity sensor,which is mainly attributed to p-n heterojunction between rGO and WS_(2).Besides,the r GO/WS_(2) humidity sensor has small humidity hysteresis(-3%RH)and good *** work demonstrates a humidity sensor based on rGO/WS_(2) composite film and provides a facile route for fabricating humidity sensor with positive humidity sensing properties.

关键词： Reduced graphene oxide WS2 nanoparticles Heterojunction Humidity sensor Humidity sensing mechanism

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A review on Ti_(3)C_(2)T_(x)-based nanomaterials:synthesis and applications in gas and humidity sensors

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Rare Metals 2021年第6期40卷 1459-1476页

作者： Qiu-Ni Zhao Ya-Jie Zhang Zai-Hua Duan Si Wang Can Liu Ya-Dong Jiang Hui-Ling Tai State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

Ti_(3)C_(2)T_(x),which is a novel two-dimensional(2 D)material,has received enormous interest in the field of sensor technology due to its large surface area,excellent electrical conductivity,and abundant active surface *** recent years,several Ti_(3)C_(2)T_(x)-based gases and humidity sensors have been developed and *** this review,we focus on the latest applications of Ti_(3)C_(2)T_(x)-based nanomaterials in gas and humidity ***,the synthesis of Ti_(3)C_(2)T_(x) from the dangerous fluorine-containing etching process to the safe fluorine-free preparation method was discussed,and the structures of the Ti_(3)C_(2)T_(x) controlled by different delamination methods were also ***,the functionalization of pristine Ti_(3)C_(2)T_(x) and composite strategies for enhancing its gas and humidity sensing performance were *** addition,the gas and humidity sensing mechanisms of sensors based on Ti_(3)C_(2)T_(x) were also ***,the challenges and opportunities for the use of Ti_(3)C_(2)T_(x) gas and humidity sensors were discussed to provide guidance on the promising potential of Ti_(3)C_(2)T_(x) in this field.

关键词： Ti_(3)C_(2)T_(x) Two-dimensional material Synthesis Gas sensor Humidity sensor

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Self-assembled graphene oxide/polyethyleneimine films as high-performance quartz crystal microbalance humidity sensors

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Rare Metals 2021年第6期40卷 1597-1603页

作者： Zhen Yuan Hui-Ling Tai Yuan-Jie Su Guang-Zhong Xie Xiao-Song Du Ya-Dong Jiang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China

As humidity is one of the most widely demanded environmental parameters,the precision of its detection is *** advanced humidity sensor will improve the validity of the humidity monitoring *** this study,a facile chemical layer-by-layer self-assembly(CLS)method was developed for fabricating graphene oxide(GO)/polyethyleneimine(PEI)multilayer *** to the chemical bonding between the PEI and GO,and the intrinsic stickiness of the PEI,layered films with different numbers of layers were successfully prepared using the CLS method and confirmed through ultraviolet-visible(UV-Vis)spectroscopy and the mass loading of quartz crystal microbalance(QCM).Morphological measurements revealed that the roughness and thickness of the films increased exponentially with the number of *** GO/PEI films were deposited on QCM electrodes using the CLS method to produce the humidity *** humidity measurement results showed a high sensitivity(37.84 Hz/%RH)and rapid response/recovery(<5 s/8 s)of the optimal sensor,which was superior to that of recently developed QCM sensors.

关键词： Humidity sensors Quartz crystal microbalance Graphene oxide Polyethyleneimine Self-assembly

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Charge density wave transition in the magnetic topological semimetal EuAl4

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Physical Review B 2024年第4期109卷 L041113-L041113页

作者： R. Yang C.-C. Le P. Zhu Z.-W. Wang T. Shang Y.-M. Dai J.-P. Hu M. Dressel Key Laboratory of Quantum Materials and Devices of Ministry of Education School of Physics Southeast University Nanjing 211189 China 1. Physikalisches Institut Universität Stuttgart 70569 Stuttgart Germany RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS) Wako Saitama 351-0198 Japan Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 People's Republic of China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 People's Republic of China Key Laboratory of Polar Materials and Devices (MOE) School of Physics and Electronic Science East China Normal University Shanghai 200241 China National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Institute of Physics Chinese Academy of Sciences Beijing 100190 China

In rare-earth intermetallic topological materials, carriers from topological bands mediate the magnetic interactions between local moments, giving rise to a plethora of exotic quantum phenomena. Recently, anomalous magnetic instability, helical spin orders, and skyrmions were found in topological semimetal EuAl4 with tetragonal lattice. Comparing with its counterpart EuGa4, which does not show intricate magnetism, the difference lies in the presence of charge-density wave (CDW) order in EuAl4. Thus, studying the effect of CDW transition on electronic structure is decisive for the final understanding of the intricate magnetism in topological materials. Here, we studied the charge excitations in EuAl4 across the CDW transition through optical spectroscopy and the first-principles calculations. After the CDW transition, a partial gap (60 meV) on the Fermi surface and an enhanced mid-infrared absorption at around 0.4 eV were observed in the optical conductivity. With the magneto-optical spectroscopy, we further observed the evolution of charge excitations alongside the magnetization. Through the first-principles calculations, we have identified that the CDW transition not only partially erodes the Fermi surface contributed by the topological bands but also modulates the high-energy excitations between the bands dominated by Eu 5d and Al 3p orbitals. In the counterpart EuGa4, the band reconstruction is absent. Since the itinerant carriers and pd hybridizations are usually assigned to mediate the magnetic interactions, our findings offer unprecedented insights to understanding the complex magnetism observed in highly symmetric topological semimetals.

关键词： Charge density waves Electronic structure Magnetic anisotropy Magneto-optical effect Topological materials Single crystal materials Optical spectroscopy Reflectivity

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