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Band offsets and electronic properties of the Ga_(2)O_(3)/FTO heterojunction via transfer of free-standing Ga_(2)O_(3) onto FTO/glass

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Chinese Physics B 2021年第11期30卷 385-388页

作者： Xia Wang Wei-Fang Gu Yong-Feng Qiao Zhi-Yong Feng Yue-Hua An Shao-Hui Zhang Zeng Liu Department of Electrical Engineering and Automation Shanxi Institute of TechnologyYangquan 045000China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China

The determination of band offsets is crucial in the optimization of Ga_(2)O_(3)-based devices,since the band alignment types could determine the operations of devices due to the restriction of carrier transport across the heterogeneous *** this work,the band offsets of the Ga_(2)O_(3)/FTO heterojunction are studied using x-ray photoelectron spectroscopy(XPS)based on Kraut’s method,which suggests a staggered type-II alignment with a conduction band offset(DEC)of 1.66 eV and a valence band offset(DEV)of􀀀2.41 ***,the electronic properties of the Ga_(2)O_(3)/FTO heterostructure are also measured,both in the dark and under ultraviolet(UV)illuminated conditions(254 nm UV light).Overall,this work can provide meaningful guidance for the design and construction of oxide hetero-structured devices based on wide-bandgap semiconducting Ga_(2)O_(3).

关键词： Ga_(2)O_(3)/FTO heterojunction band alignment magnetron sputtering free-standing

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From liquid metal to stretchable electronics:Overcoming the surface tension

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Science China materials 2022年第8期65卷 2072-2088页

作者： Zixu Yang Dan Yang Xizheng Zhao Qinyi Zhao Ming Zhu Yan Liu Yu Wang Weihong Lu Dianpeng Qi MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China National and Local Joint Engineering Laboratory for Synthesis Transformation and Separation of Extreme Environmental NutrientsHarbin Institute of TechnologyHarbin 150001China School of Materials Science&Engineering Zhengzhou UniversityZhengzhou 450001China

The field of stretchable electronics mainly includes electronic products conformal with tissues,being integrated into skin or *** these products need to work during deformation,their requirements for materials focus on stretchability and *** metals are excellent materials with these ***,liquid metals have extremely high surface tension at room temperature,which will spontaneously form a spherical shape and are difficult to form the shape required by stretchable devices,which is the biggest obstacle to their development in this emerging ***,the emphasis is placed on the principle of overcoming the high surface tension in this review,and various methods of using liquid metals to fabricate stretchable electronic devices based on these principles have been *** metals show promise in the convenience of sensing,energy harvesting,*** existing challenges and opportunities are also discussed here.

关键词： liquid metals EGaIn Galinstan stretchable electronics surface tension

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多孔氮掺杂FeP/C纳米纤维作为钾离子电池负极

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Journal of Central South University 2023年第10期30卷 3248-3259页

作者：张文刘烨叶仲强阳敏罗琪戴晶王乾富刘黎 National Base for International Science&Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionKey Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationSchool of ChemistryXiangtan UniversityXiangtan 411105China

由于自然界中钾储量巨大且K+/K电位低,钾离子电池(PIBs)被认为是锂离子电池的替代品之一。因此,在这项工作中,我们合成了多孔氮掺杂FeP/C纳米纤维(P-FeP/C-N NFs),一种用于PIB的新型电极材料。通过简单的静电纺丝和随后的煅烧处理,将聚... 详细信息

由于自然界中钾储量巨大且K+/K电位低,钾离子电池(PIBs)被认为是锂离子电池的替代品之一。因此,在这项工作中,我们合成了多孔氮掺杂FeP/C纳米纤维(P-FeP/C-N NFs),一种用于PIB的新型电极材料。通过简单的静电纺丝和随后的煅烧处理,将聚丙烯腈(PAN)和聚甲基丙烯酸甲酯(PMMA)分别用作氮源和造孔剂,引入氮提高了材料的导电性,多孔结构的形成增加了比表面积。将P-FeP/CN NFs用作钾离子电池的电极,表现出优异的电化学性能。P-FeP/C-N NFs电极在100 mA/g循环250次后放电容量为274.2 mA·h/g,在1000 mA/g循环300次后放电容量为171.3 mA·h/g。即使在5000 mA/g下,也显示出150.1 mA·h/g的高放电容量。结果表明P-FeP/C-N NFs有望成为钾离子电池负极材料的候选材料。

关键词：静电纺丝 FeP 氮掺杂多孔纳米纤维钾离子电池

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Broadband photomultiplication-type polymer photodetectors and its application in light-controlled circuit

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Science China Chemistry 2022年第8期65卷 1642-1649页

作者： Ming Liu Qunping Fan Kaixuan Yang Zijin Zhao Xingchao Zhao Zhengji Zhou Jian Zhang Francis Lin Alex K.-Y.Jen Fujun Zhang Key Laboratory of Luminescence and Optical Information Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China Department of Chemistry City University of Hong KongHong Kong 999077China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand School of MaterialsHenan UniversityKaifeng 475004China Guangxi Key Laboratory of Information Materials School of Material Science and TechnologyGuilin University of Electronic TechnologyGuilin 541004China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Materials Science and Engineering University of WashingtonWashington 98195-2120United States Hong Kong Institute for Clean Energy City University of Hong KongHong Kong 999077China

Photomultiplication-type polymer photodetectors(PM-PPDs)were achieved with polymer P3HT as donor and PY3Se-1V as acceptor based on structure of ITO/PEDOT:PSS/active layer/*** optimal weight ratio of P3HT to PY3Se-1V is about 100:*** of isolated electron traps are formed with PY3Se-1V surrounded by P3HT due to rather less content of PY3Se-1V in active layers and about 0.94 e V energy offset between the lowest unoccupied molecular orbitals(LUMO)of P3HT and *** optimal PM-PPDs exhibit broad spectral response from 350 to 950 nm and external quantum efficiency(EQE)values of68,200%at 360 nm,26,400%at 630 nm and 19,500%at 850 nm under-15 V *** working mechanism of PM-PPDs is attributed to the interfacial trap-assisted hole tunneling injection from external *** performance of PM-PPDs can be further improved by incorporating appropriate PMBBDT with high hole mobility as the third *** EQE values of optimal ternary PM-PPDs are increased to 105,000%at 360 nm,40,000%at 630 nm and 31,800%at 850 nm under-15 V bias,benefiting from the enhanced hole transport in ternary active *** optimal ternary PM-PPDs were successfully applied in a light-controlled circuit to turn on or turn off light emitting diode(LED).

关键词： polymer photodetectors photomultiplication external quantum efficiency broadband

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Unraveling the efficiency losses and improving methods in quantum dot-based infrared up-conversion photodetectors

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Opto-Electronic Science 2024年第4期3卷 1-11页

作者： Jiao Jiao Liu Xinxin Yang Qiulei Xu Ruiguang Chang Zhenghui Wu Huaibin Shen Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-efficiency Display and Lighting TechnologySchool of MaterialsHenan UniversityKaifeng 475004China

Quantum dot-based up-conversion photodetector,in which an infrared photodiode(PD)and a quantum dot light-emitting diode(QLED)are back-to-back connected,is a promising candidate for low-cost infrared ***,the huge efficiency losses caused by integrating the PD and QLED together hasn’t been studied *** work revealed at least three origins for the efficiency ***,the PD unit and QLED unit usually didn’t work under optimal conditions at the same ***,the potential barriers and traps at the interconnection between PD and QLED units induced unfavorable carrier ***,much emitted visible light was lost due to the strong visible absorption in the PD *** on the understandings on the loss mechanisms,the infrared up-conversion photodetectors were optimized and achieved a breakthrough photon-to-photon conversion efficiency of 6.9%.This study provided valuable guidance on how to optimize the way of integration for up-conversion photodetectors.

关键词： infrared colloidal quantum dots up-conversion photodetector integration loss interconnection voltage allocation

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Design and Preparation of High Color Rendering Red Inorganic Pigment Via Red Light Emission Phosphor

SSRN

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SSRN 2023年

作者： Wang, Qiangbin Du, Yuze Seto, Takatoshi Wang, Yuhua Liu, Wenjing National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology National Development and Reform Commission Department of Materials Science School of Materials and Energy Lanzhou University No. 222 South Tianshui Road Gansu Lanzhou730000 China

In this paper, a new method to improve the color rendering performance of inorganic red pigment by adding phosphor is proposed. The optimal mixing ratios of (Ca,Sr)AlSiN3:Eu2+, (Sr,Ba)2Si5N8:Eu2+ and NaMgPO4:Eu2+ phosphors in the γ-Ce2S3 red material are 20%, 10% and 5%, respectively. At the optimal mixing ratios;L* increased by 12.9%, 3.5% and 3%, separately;a* increased by 4.3%, 4% and 1.6% severally;C* increased by 7.9%, 4.3% and 1.5% in turn. Of course, the different properties of the phosphors themselves make the mixing ratios different. Subsequently, the mechanism of pigment fluorescent materials is further investigated by using Chromatometer, SEM, Fluorescence Photometer, UV-vis Spectrophotometer and Fluorescence Microscope. The results shows that, under the irradiation of sunlight, the fluorescent materials in the fluorescent pigments are excited by the light of specific wavelengths in the sunlight, producing an asymmetric broad-band emission in the visible red region. The light emitted as a second light source is diffusely reflected by the pigment particles, which plays a superimposed effect and finally improves the color rendering ability of the red γ-Ce2S3 pigment that originally relies only on the reflected sunlight energy. © 2023, The Authors. All rights reserved.

关键词： Phosphors

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Bionic Optimization Design of Electronic Nose Chamber for Oil and Gas Detection

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Journal of Bionic engineering 2018年第3期15卷 533-544页

作者： Zhiyong Chang Youhong Sun Yuchen Zhang Yanli Gao Xiaohui Weng Donghui Chen Liewe David Jun Xie Key Lab of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China Key Laboratory of Bionic Engineering Ministry of Education Jilin University Changchun 130022 China National-Local Joint Engineering Laboratory of In-situ Conversion Drilling and Exploitation Technology for Oil Shale Jilin University Changchun 130021 China College of Construction Engineering Jilin University Changchun 130022 China Clinical Medicine Bethune First Hospital of Jilin University Changchun 130021China College of Mechanical Science and Engineering Jilin University Changchun 130022 China School of Computing and Technology the University of Gloucestershire The Park Cheltenham GL50 2RH UK Air Combat Service Academy Air Force Aviation University Changchun 130021 China

In this paper, a miniaturized bionic electronic nose system is developed in order to solve the problems arising in oil and gas detection for large size and inflexible operation in downhole. The bionic electronic nose chamber is designed by mimicking human nasal turbinate structure, V-groove structure on shark skin surface and flow field distribution around skin surface. The sensitivity of the bionic electronic nose system is investigated through experimentation. Radial Basis Function （RBF） and Support Vector Machines （SVM） of 10-fold cross validation are used to compare the recognition performance of the bionic electronic nose system and common one. The results show that the sensitivity of the bionic electronic nose system with bionic composite chamber （chamber B） is significantly improved compared with that with common chamber （chamber A）. The recognition rate of chamber B is 4.27% higher than that of chamber A for the RBF algorithm, while for the SVM algorithm, the recognition rate of chamber B is 5.69% higher than that of chamber A. The three-dimensional simulation model of the chamber is built and verified by Computational Fluid Dynamics （CFD） simulation analysis. The number of vortices in chamber B is fewer than that in chamber A. The airflow velocity near the sensors inside chamber B is slower than that inside chamber A. The vortex intensity near the sensors in chamber B is 2.27 times as much as that in chamber A, which facilitates gas molecules to fully contact with the sensor surface and increases the intensity of sensor signal, and the contact strength and time between odorant molecules and sensor surface. Based on the theoretical investigation and test validation, it is believed that the proposed bionic electronic nose system with bionic composite chamber has potential for oil and gas detection in downhole.

关键词： electronic nose bionic chamber sensors oil gas detection

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Synthesis and characterization of Na0.44MnO2 nanorods/graphene composite as cathode materials for sodium-ion batteries

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Journal of Central South University 2019年第6期26卷 1510-1520页

作者： ZHANG Yue OUYANG Yan LIU Li XIA Jing NIE Su LIU Wen WANG Xian-you National Base for International Science & Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionKey Laboratory of Environmentally Friendly Chemistry and Application of Ministry of EducationCollege of ChemistryXiangtan UniversityXiangtan 411105China Key Laboratory of Advanced Energy Materials Chemistry of Ministry of Education Nankai UniversityTianjin 300071China

Na0.44MnO2 nanorods have been prepared by a hydrothermal *** experimental parameters have been systematically investigated and *** results show that Na0.44MnO2 nanorods obtained via the hydrothermal treatment at 200℃for 16 h show the best electrochemical properties,which deliver the high initial discharge capacity of 110.7 mA·h/g at 50 mA/g in potential window 2.0-4.0 *** further improve their electrochemical properties,a ball milling process with graphene has been carried out to obtain Na0.44MnO2/graphene *** initial discharge capacity of Na0.44MnO2/graphene composite is 106.9 mA·h/g at a current density of 50 mA/*** 100 cycles,the residual discharge capacity is 91.8 mA·h/g and the capacity retention rate is 85.9%,which is much higher than that of pristine Na0.44MnO2 nanorods(74.7%)at the same *** is more,when the current density reaches 500 and 1000 mA/g,the corresponding discharge capacities of Na0.44MnO2/graphene composite are about 89 and 78 mA·h/g,respectively,indicating outstanding rate capability.

关键词： manganese-based compounds hydrothermal method sodium-ion batteries composite materials

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On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

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Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation

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Science China materials 2022年第1期65卷 147-154页

作者： Shilong Jiao Xianwei Fu Shuangchen Ruan Yu-Jia Zeng Hongwen Huang College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Key Lab for Special Functional Materials of Ministry of Education Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Henan UniversityKaifeng 475004China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

The development of cost-effective and highperformance electrocatalysts has been increasingly studied to mitigate upcoming energy and environmental *** and heterointerface engineering have played significant roles in the rational design of electrocatalysts and modulation of their electrocatalytic ***,the synergistic effect between amorphization and heterointerfaces has been scarcely *** a proof-of-concept attempt,we develop amorphous FeMo(a-FeMo)electrocatalysts with an abundance of heterointerfaces that are composed of amorphous components and evaluate their electrocatalytic performances toward the nitrogen reduction reaction and oxygen evolution reaction(OER).Benefitting from the synergistic effect between the amorphous nature of the a-FeMo electrocatalysts,which offer a high density of active sites,and significant electron redistribution at the heterointerfaces,the electrocatalysts exhibit a high Faradaic efficiency of 29.15%,an elevated yield rate of 71.78μg_(NH_(3)) mg_(cat.)^(-1) h^(-1) with long-term stability at a potential of-0.1V *** hydrogen electrode and excellent electrocatalytic activity toward the *** study provides a promising and effective method for the rational design of low-cost heterogeneous catalysts with desirable efficiency,selectivity,and stability.

关键词： amorphism and heterointerface nitrogen reduction reaction OER electrocatalyst design electrocatalytic conversion

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