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Optimizing and fabricating magnetocaloric materials

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Chinese Physics B 2014年第4期23卷 1-8页

作者：刘剑 key laboratory of Magnetic materials and devices Ningbo Institute of Material Technology and EngineeringChinese Academy of Sciences

The microstructural modification of existing materials for magnetic cooling applications, and mass fabrication of the modified materials are reviewed, emphasizing the maximization of magnetic entropy change and minimization of hysteresis losses, as well as the engineering problems in the actual application of promising materials. In the first part, physical rules are put forward to explore high performance magnetic refrigerants, including the enhancement of adiabatic temperature change in finite field, multi-caloric effects, and multi-layered structure. Special attention is given to non-magnetic proper- ties. Following this, an overview of mass fabrication of magnetic refrigerants having large entropy change, small hysteresis, good mechanical properties, and high thermal conductivity is presented.

关键词： magnetocaloric effect hysteresis microstructure

Influence of channel length and layout on TID for 0.18 μm NMOS transistors

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Nuclear Science and Techniques 2013年第6期24卷 17-22页

作者： WU Xue LU Wu WANG Xin GUO Qi HE Chengfa LI Yudong XI Shanbin SUN Jing WEN Lin key laboratory of functional materials and devices for Special Environments Xinjiang Technical Institute of Physics & ChemistryChinese Academy of Sciences Xinjiang key laboratory of Electronic Information material and Device Graduate University of Chinese Academy of Sciences

Different channel lengths and layouts on 0.18μm NMOS transistors are designed for investigating the dependence of short channel effects(SCEs)on the width of shallow trench isolation(STI)devices and designing in radiation *** show that,prior to irradiation,the devices exhibited near–ideal I–V characteristics,with no significant *** irradiation,no noticeable shift of threshold voltage is observed,radiation–induced edge–leakage current,however,exhibits significant sensitivity on ***,radiation–enhanced drain induced barrier lowering(DIBL)and channel length modulation(CLM)effects are observed on short–channel NMOS *** to stripe–gate layout,enclosed–gate layout has excellent radiation tolerance.

关键词： NMOS晶体管沟道长度 TID 短沟道效应辐射诱发通道长度沟槽隔离特性曲线

A Rational Design of Heterojunction Photocatalyst Cd S Interfacing with One Cycle of ALD Oxide

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Journal of materials Science & Technology 2016年第6期32卷 489-495页

作者： Mengyin Liu Xinjian Xie Lei Chen Xuewei Wang Yahui Cheng Feng Lu Wei-Hua Wang Jing Yang Xiwen Du Junda Zhu Haitao Liu Hong Dong Weichao Wang Hui Liu Department of Electronics and key laboratory of Photo-Electronic Thin Film devices and Technology of Tianjin Nankai University School of material Science and Engineering Hebei University of Technology Institute of material Physics Key Laboratory of Display Materials and Photoelectric DevicesTianjin University of Technology Tianjin key laboratory of Composite and functional materials and School of materials Science and Engineering Tianjin University key laboratory of Optical Information Science and Technology Ministry of EducationInstitute of Modern OpticsNankai University

Photo-corrosion is one of the major obstacles for CdS application in wet chemical fields, and atomic layer deposition （ALD） has been proposed as an effective way to suppress the corrosion. Here, prior to ALD coating, CdS, one facilely corrosive photocatalyst, was synthesized via hydrothermal synthesis to access the fundamental corrosion mechanism and the according corrosive sites. X-ray photoelectron spectros- copy （XPS） and X-ray diffraction （XRD） demonstrated that the failure of catalytic decomposition of methylene blue originated from the formation of soluble CdSO4 by oxidizing S2 of as-prepared CdS. High resolu- tion transmission electron microscopy （HRTEM） further identified the active sites in the V-shaped regions ofCdS nanoparticles, confirmed by the simulated electric field distribution. To rationally coat oxides on CdS, the right candidates and their thicknesses have been considered by our tunneling model with trans- fer matrix method based on quantum mechanism, upon which the thickness of protective layer should be less than 0.5 nm to maintain a high tunneling probability, and thus one cycle of ALD TiO2 or AbO3 was proposed to passivate the CdS powder to balance the carrier transportation and corrosion suppres- sion. Based on HRTEM results, we found that the active V-shaped region was covered by ALD oxides （TiO2 or AbO3）. For each case, no soluble CdSO4 has been found before and after photocatalytic reactions based XPS measurements. Importantly, we noticed that with the passivation of one cycle of ALD, the catalyst＇s lifetime was elongated up to 〉14 times higher than that of the as-prepared CdS.

关键词： Cadmium sulfide PhotocatalysisPhoto-corrosion suppression Atomic layer deposition Quantum tunneling Transfer matrix method

Observation of giant magnetocaloric effect under low magnetic fields in EuTi_(1-x)Co_xO_3

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Chinese Physics B 2017年第11期26卷 475-480页

作者：孙启磊莫兆军沈俊黎玉进李兰张君凯刘国栋唐成春孟凡斌 School of material Science and Engineering Hebei University of Technology key laboratory of Display materials and Photoelectric devices of Ministry of Education of Ministry of Education Key Laboratory for Optoelectronic Materials and Devices of Tianjin Institute of Material Physics School of Material Science and EngineeringTianjin University of Technology key laboratory of Cryogenics Technical Institute of Physics and Chemistry Chinese Academy of Sciences

The magnetic properties and magnetocaloric effect（MCE） in EuTi1-xCoxO3（x = 0, 0.025, 0.05, 0.075, 0.1） compounds have been investigated. When the Ti^4＋ ions were substituted by Co2＋ions, the delicate balance was changed between antiferromagnetic（AFM） and ferromagnetic（FM） phases in the EuTiO3 compound. In EuTi1-xCoxO3 system, a giant reversible MCE and large refrigerant capacity（RC） were observed without hysteresis. The values of -△SM^max were evaluated to be around 10 J·kg^-1·K^-1 for EuTi0.95Co0.05O3 under a magnetic field change of 10 kOe. The giant reversible MCE and large RC suggests that EuTi1-xCoxO3 series could be considered as good candidate materials for low-temperature and low-field magnetic refrigerant.

关键词： magnetocaloric effect magnetic entropy change magnetic phase transformation

New advances in small molecule hole-transporting materials for perovskite solar cells

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Chinese Chemical Letters 2016年第8期27卷 1293-1303,1469页

作者： Ya-Kun Wang Zuo-Quan Jiang Liang-Sheng Liao Jiangsu key laboratory for Carbon-Based functional materials & devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University

Organic π-functional molecules are the foundation and basic component of organic optoelectronic *** example,for ideal carrier transporting materials,extended π-conjugation and ordered π-πstacking are necessary to enhance the charge mobility and achieve desirable *** a promising way to convert sunlight into electricity,organometal halide perovskite solar cells（PSCs） have captured a lot of attention due to its predominant merits especially in the aspect of remarkable photovoltaic performance and much potentially low production *** conventional planar PSC structure,hole-transporting layer which typically consists of organic π-functional materials plays a key role in suppressing holeelectron pair recombination,promoting charge transporting and ensuring ohmic contact of back *** the key roles of HTMs and its soaring progress in recent years,here,we will summarize recent progress in small organic π-functional materials from its diverse functions in ***,aiming to further promote the development of organic π-functional molecules and HTMs,a promising direction toward highly efficient HTMs will also be discussed.

关键词： Perovskite solar cell Photovoltaic device Small molecule Conjugated structure Hole-transporting material

Six-channel programmable coding metasurface simultaneously for orthogonal circular and linear polarizations

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Photonics Research 2023年第6期11卷 1047-1056页

作者： TONGHAO LIU YUEYU MENG JIAFU WANG HUA MA RUICHAO ZHU CHAO LIU WEIHAN LI ZUNTIAN CHU SAI SUI TIANSHUO QIU WENXUAN TANG SHAOBO QU shaanxi key laboratory of artificially-structured functional materials and devices Air Force Engineering UniversityXi’an 710051China State key laboratory of Millimeter Waves Southeast UniversityNanjing 210096China Frontiers Science Center for Mobile Information Communication and Security Southeast UniversityNanjing 210096China

Metasurfaces have intrigued long-standing research interests and developed multitudinous compelling applications owing to their unprecedented capability for manipulating electromagnetic waves,and the emerging programmable coding metasurfaces(PCMs)provide a real-time reconfigurable platform to dynamically implement customized ***,most existing PCMs can only act on the single polarization state or perform in the limited polarization channel,which immensely restricts their practical application in multitask intelligent ***,an appealing strategy of the PCM is proposed to realize tunable functions in co-polarized reflection channels of orthogonal circularly polarized waves and in co-polarized and cross-polarized reflection channels of orthogonal linearly polarized waves from 9.0 to 10.5 *** the above six channels,the spindecoupled programmable meta-atom can achieve high-efficiency reflection and 1-bit digital phase modulation by selecting the specific ON/OFF states of two diodes,and the phase coding sequence of the PCM is dynamically regulated by the field-programmable gate array to generate the desired function.A proof-of-concept prototype is constructed to verify the feasibility of our methodology,and numerous simulation and experimental results are in excellent agreement with the theoretical *** inspiring design opens a new avenue for constructing intelligent metasurfaces with higher serviceability and flexibility,and has tremendous application potential in communication,sensing,and other multifunctional smart metadevices.

关键词： polarization channel polarized

Interlayer-expanded MoS2 assemblies for enhanced electrochemical storage of potassium ions

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Nano Research 2020年第1期13卷 225-230页

作者： Sijia Di Pan Ding Yeyun Wang Yunling Wu Jun Deng Lin Jia Yanguang Li Institute of functional Nano and Soft materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou215123China

Potassium-ion batteries are regarded as the low-cost alternative to lithium-ion ***,their development is hampered by the lack of suitable electrode *** this work,we demonstrate that MoS2 with expanded interlayers represents a promising candidate for the electrochemical storage of potassium *** interlayer-expanded MoS2 assemblies supported on carbon nanotubes are prepared via a straightforward solution *** increased interlayer spacing not only enables the better accommodation of foreign ions,but also lowers the diffusion energy barrier and improves diffusion kinetics of *** investigated as the anode material of potassium ion batteries,our interlayer-expanded MoS2 assemblies exhibit an excellent electrochemical performance with large capacity(up to∼520 mAhg^−1),good rate capability(∼310 mAhg^−1 at 1,000 mAg^−1)and impressive cycling stability,superior to most competitors.

关键词： molybdenum disulfide interlayer expansion potassium ion batteries hierarchical structure

Iron polyphthalocyanine sheathed multiwalled carbon nanotubes： A high-performance electrocatalyst for oxygen reduction reaction

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Nano Research 2016年第5期9卷 1497-1506页

作者： Xinxia wang Bin Wang Jun Zhong Feipeng Zhao Na Han Wenjing Huang Min Zeng Jian Fan Yanguang Li Institute of functional Nano & Soft materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow University Suzhou 215123 China

The past decade has witnessed a rapid surge of interest in the research and development of non-precious metal-based electrocatalysts for the oxygen reduction reaction （ORR）. Until now, the best catalysts in acidic electrolytes have exclusively been Fe-N-C-type materials from high-temperature pyrolysis. Despite the ORR activities of metal phthalocyanine or porphyrin macrocydes having long been known, their durability remains poor. In this work, we use these macrocycles as a basis to develop a novel organic-carbon hybrid material from in-situ polymerization of iron phthalocyanine on conductive multiwalled carbon nanotube scaffolds using a low-temperature microwave heating method. At an optimal polymer- to-carbon ratio, the hybrid electrocatalyst exhibits excellent ORR activity with a positive half-wave potential （0.80 V）, large mass activity （up to 18.0 A/g at 0.80 V）, and a low peroxide yield （〈3%）. In addition, strong electronic coupling between the polymer and carbon nanotubes is believed to suppress demetallization of the macrocycles, significantly improving cycling stability in acids. Our study represents a rare example of non-precious metal-based electrocatalysts prepared without high-temperature pyrolysis, while having ORR activity in acidic media with potential for practical applications.

关键词： iron polyphthalocyanine carbon nanotubes organic-carbon hybrid oxygen reduction reaction electrocatalysis

Improved Performance of Pentacene Organic Field-Effect Transistors by Inserting a V_(2)O_(5) Metal Oxide Layer

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Chinese Physics Letters 2011年第12期28卷 235-238页

作者： ZHAO Geng CHENG Xiao-Man TIAN Hai-Jun DU Bo-Qun LIANG Xiao-Yu School of Science Tianjin University of TechnologyTianjin 300384 Institute of material Physics Key Laboratory of Display Material and Photoelectric Devices(Ministry of Education)and Tianjin Key Laboratory of Photoelectric Materials and DevicesTianjin University of TechnologyTianjin 300384

We fabricate pentacene-based organic field effect transistors(OFETs),inserting a transition metal oxide(V_(2)O_(5))layer between the pentacene and Al source−drain(S/D)*** performance of the devices with V_(2)O_(5)/Al S/D electrodes is considerably improved compared to the pentacene−based OFET with only Al S/D *** the 10-nm V2O5 layer modification,the effective field-effect mobility of the devices increases from 2.7×10^(−3) cm^(2)/V⋅s to 8.93×10−1 cm^(2)/V⋅*** to the change of the injection property,the effective threshold voltage(Vth)is changed from−7.5 V to−5 V and the on/off ratio shifts from 102 to ***,the dispersion of sub−threshold current in the devices *** performance improvements are ascribed to the low carrier injection barrier and the reduction of contact *** is indicated that V2O5 layer modification is an effective approach to improve pentacene-based OFET performance.

关键词： drain injection effect