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Chiral phonon activated spin Seebeck effect in chiral materials

science China(physics,Mechanics & Astronomy) 2024年第3期67卷 149-155页

作者： Xiao Li Jinxin Zhong Jinluo Cheng Hao Chen Huiqian Wang Jun Liu Dali Sun Lifa Zhang Jun Zhou Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China Center for Phononics and Thermal Energy Science China-EU Joint Lab for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of ScienceChangchun 130033China Department of Mechanical and Aerospace Engineering North Carolina State UniversityRaleigh NC 27606USA Department of Physics North Carolina State UniversityRaleigh NC 27695USA Organic and Carbon Electronics Laboratories(ORaCEL) North Carolina State UniversityRaleigh NC 27606USA

Efficient generation of spin polarization is very important for spintronics and quantum computation. In chiral materials without magnetic order nor spin-orbit coupling, we find a new spin selectivity effect—chiral phonon activated spin Seebeck(CPASS)effect. Starting with the nonequilibrium distribution of chiral phonons under a temperature gradient, the CPASS coefficients are computed based on the Boltzmann transport theory. With both the phonon-drag and band transport contributions, the spin accumulations generated by the CPASS effect exhibit quadratic dependence on the temperature gradient. The strength of the CPASS effect and the relative magnitude of both contributions are tunable by the chemical potential modulation. The CPASS effect, which gives a promising explanation on the traditional chiral-induced spin selectivity effect, provides opportunities for the exploration of advanced spintronic devices based on chiral materials even in the absence of any magnetic order and spin-orbit coupling.

关键词： spin Seebeck effect chiral phonon phonon-drag contribution efficient spin generation

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Photocatalytic bio-inspired PDA-RGO/g-C3N4 nanocomposite incorporated PES membrane for removal of environmental antibiotic pollutants

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Journal of Chemical technology and Biotechnology 2024年第6期99卷 1401-1413页

作者： Govardhanan, B. GokulaKrishnan, S.A. Arthanareeswaran, G. Ashok, M. Chen, Yong-Song Taweepreda, W. Membrane Research Laboratory Department of Chemical Engineering National Institute of Technology Tiruchirappalli Tiruchirappalli India New Generation Materials lab Department of Physics National Institute of Technology Tiruchirappalli Tiruchirappalli India Department of Mechanical Engineering and Advanced Institute of Manufacturing with High-tech Innovations National Chung Cheng University Chiayi County Taiwan Polymer Science Program Division of Physical Science Faculty of Science Prince of Songkla University Hat-Yai Thailand

BACKGROUND: Membrane technology makes it more suitable for the treatment of environmental polluted organic wastewater. Membrane fouling is one of the major concerns in commercial membranes. To overcome this issue, photocatalytic nanomaterials are embedded into the membrane to enhance its surface nature and reusability. In this investigation, polydopamine functionalized graphene oxide (PDA-RGO), graphite carbon nitride (g-C3N4) and PDA-RGO/g-C3N4 nanomaterials were incorporated within polyethersulfone membrane fabricated via a phase inversion technique. These as-prepared membranes’ functional groups and surface morphologies were investigated by Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM) and field emission electron microscopy (FESEM). These as-prepared membranes were investigated for photocatalytic activity under visible-light-driven photodegradation by environmental pollutants such as Rhodamine B (RhB) and Norfloxacin (NOR). RESULTS: Compared with pristine PES membrane, the PDA-RGO/g-C3N4-PES nanocomposite membrane showed higher photocatalytic activity for Rhodamine B 94.6% and Norfloxacin 96.8%, also reached greater water flux 189 L m−2 h−1. Therefore, the bio-inspired nanocomposite-modified PDA-RGO/g-C3N4 photocatalytic membrane could have huge potential in processing environmentally polluted water. CONCLUSIONS: PDA-RGO/g-C3N4-PES nanocomposite membrane improved the membrane hydrophilicity, water flow, anti-fouling performance, rejection studies and photocatalytic degradation than the pristine membrane. The synergistic result of PDA-RGO and g-C3N4 exhibits better photodegradation efficiency of the membrane towards environmental pollutants. © 2024 Society of Chemical Industry (SCI). © 2024 Society of Chemical Industry (SCI).

关键词： Nanocomposites

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Miniaturized Terahertz Source Based on Micro-nano-grating Dielectric Waveguide

Miniaturized Terahertz Source Based on Micro-nano-grating Di...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Yang, Ji-Tao Du, Chao-Hai Zhang, Zi-Wen Wang, Shao-Meng School of Electronics Peking University Ctr. for Carbon-based Electronics and State Key Lab. of Adv. Optical Commun. Systems and Networks Beijing China Electronics University of Electronic Science and Technology of China National Key Laboratory of Science and Technology on Vacuum Chengdu China

ISBN: (纸本)9781733509657

In recent years, with the continuous progress of science and technology, terahertz technology has been widely applied. In the preparation of terahertz sources, vacuum electronics technology has always been one of the main research directions. However, the traditional vacuum electronic light source has some shortcomings, such as high energy consumption, easy to damage the crystal and easy to be subjected to environmental noise. Therefore, how to achieve miniaturized, high-efficiency and low-cost terahertz light sources has always been the focus of researchers' attention. In this respect, the miniaturized terahertz source based on micro-nano-grating dielectric waveguide provides us with a new solution. We construct a terahertz source based on a micro-nano-grating dielectric waveguide with an operating frequency of 32THz, which can be driven by single electrons, electron bunches and periodic electron sequences. In addition, the miniaturized terahertz source has the advantages of easy integration and low preparation cost. It can be used in terahertz optics, communication, development, biomedical engineering and other fields. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Light sources

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Light People:*** Bowers spoke about silicon photonics

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Light(science & Applications) 2022年第12期11卷 2843-2848页

作者： Chenzi Guo Yating Wan Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina Integrated Photonics lab King Abdullah University of Science and TechnologyThuwalMakkah

Editorial Silicon photonics is advancing rapidly with many scientific and engineering advances and many new applications for *** highlight the topic,Light:science&Applications invited John Bowers,director of the Institute for Energy Efficiency and distinguished professor from the University of California,Santa Barbara,to talk about the fundamentals and industries,and give a future perspective of silicon *** below is summarized from the video interview of *** original interview can be accessed in Supplementary video.

关键词： Efficiency interview photonics

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Simultaneous enhancement of piezoelectricity and temperature stability in Pb(Ni_(1/3)Nb_(2/3))O_(3)-PbZrO_(3)-PbTiO_(3)piezoelectric ceramics via Sm-modification

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Journal of Advanced Ceramics 2024年第10期13卷 1578-1589页

作者： Kai Li Shan Cong Lang Bian Zhenting Zhao Jie Wu Junfeng Zhao Duoduo Zhang Haijuan Mei Enwei Sun Xudong Qi Weiping Gong Bin Yang Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou UniversityHuizhou 516001China Condensed Matter Science and Technology Institute School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Electronic Materials Research Laboratory(Key Lab of Education Ministry) State Key Laboratory for Mechanical Behavior of Materials and School of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Physics and Electronic Engineering Key Laboratory for Photonic and Electronic Bandgap MaterialsMinistry of EducationHarbin Normal UniversityHarbin 150025China

The development of piezoelectric ceramics characterized by both large piezoelectric response and high-temperature stability is imperative for the advancement of practical electromechanical ***,existing high-performance piezoelectric ceramics often encounter compromised temperature stability because ferroelectric phase transitions occur within low-temperature *** this work,we focused on Sm-doped Pb(Ni_(1/3)Nb_(2/3))O_(3)-PbZrO_(3)-PbTiO_(3)(PNN-PZT:Sm)ceramics with a tetragonal(T)-phase structure to achieve the desired combination of high piezoelectricity and high temperature *** results indicate that 2 mol%Sm-doped samples exhibit a large piezoelectric constant(d_(33))of 575 pC/N,an effective piezoelectric strain coefficient(d_(33)*)of 890 pm/V,and a high ferroelectric-to-paraelectric phase transition temperature(Tm)of 279℃.Remarkably,d_(33) experiences only a 2.6%variation over the temperature range of 30-250℃,while d_(33)*changes by 8%within the temperature range of 30-180℃.Microstructural and domain structure analyses suggest that Sm-doping effectively reduces the grain size,leading to a decreased domain size,thereby achieving excellent electromechanical *** superior temperature stability is attributed to the suppressive effect of Sm-doping on the R-T ferroelectric phase *** studies suggest that Sm-doping represents an effective strategy for achieving the collaborative optimization of piezoelectricity and temperature stability through grain and domain engineering techniques for perovskite ferroelectric materials.

关键词： PNN-PZ-PT ceramics Sm-doping piezoelectricity temperature stability domain structures

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Organic Passivation of Deep Defects in Cu(In,Ga)Se_(2) Film for Geometry-Simplified Compound Solar Cells

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Research 2023年第4期2023卷 425-435页

作者： Jingwei Chen Xuan Chang Jianxin Guo Qing Gao Xuning Zhang Chenxu Liu Xueliang Yang Xin Zhou Bingbing Chen Feng Li Jianming Wang Xiaobing Yan Dengyuan Song Han Li Benjamin S.Flavel Shufang Wang Jianhui Chen Advanced Passivation Technology Lab College of Physics Science and TechnologyHebei UniversityBaoding071002China State Key Laboratory of Photovoltaic Materials&Technology Yingli Green Energy Holding Co.Ltd.Baoding 071051China Das Solar Co. Ltd.No 43 Bailing South RoadQuzhou Green Industry Clustering ZoneQuzhouZhejiang Province324022China Institute of Nanotechnology Karlsruhe Institute of TechnologyHermann-von-Helmholtz-Platz 1EggensteinLeopoldshafen76344Germany.

Diverse defects in copper indium gallium diselenide solar cells cause nonradiative recombination losses and impair device ***,an organic passivation scheme for surface and grain boundary defects is reported,which employs an organic passivation agent to infiltrate the copper indium gallium diselenide thin films.A transparent conductive passivating(TCP)film is then developed by incorporating metal nanowires into the organic polymer and used in solar *** TCP films have a transmittance of more than 90%in the visible and nearinfrared spectra and a sheet resistance of~10.5Ω/*** leads to improvements in the open-circuit voltage and the efficiency of the organic passivated solar cells compared with control cells and paves the way for novel approaches to copper indium gallium diselenide defect passivation and possibly other compound solar cells.

关键词： copper visible Defects

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Micro composite vacuum gauge for space applications

Micro composite vacuum gauge for space applications

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International Conference on vacuum Electronics

作者： Gang Li Xiaodong Han Zhengyi Ren Yongjun Cheng Detian Li Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China School of Aerospace Engineering Xiamen University Xiamen China

A configuration of micro vacuum gauge combined the benefits of capacitive gauge (CDG) and Pirani gauge was proposed for space exploration. The reading of the CDG is independent of gas composition to be measured, which can be used as a calibration standard. The Pirani gauge, with strong discrimination against different gases, is adopted as a gas composition analyzer in this configuration. With this design, the partial pressure of certain gas components can be analyzed qualitatively or even quantitatively. Considering its small size, weight and power consumption, it has significant advantages in space applications.

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Towards mixed physical node reservoir computing:light-emitting synaptic reservoir system with dual photoelectric output

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Light(science & Applications) 2024年第9期13卷 1865-1877页

作者： Minrui Lian Changsong Gao Zhenyuan Lin Liuting Shan Cong Chen Yi Zou Enping Cheng Changfei Liu Tailiang Guo Wei Chen Huipeng Chen Institute of Optoelectronic Display National&Local United Engineering Lab of Flat Panel Display TechnologyFuzhou UniversityFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350100China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore Department of Physics National University of Singapore3 Science Drive 3Singapore 117543Singapore

Memristor-based physical reservoir computing holds significant potential for efficiently processing complex spatiotemporal data,which is crucial for advancing artificial ***,owing to the single physical node mapping characteristic of traditional memristor reservoir computing,it inevitably induces high repeatability of eigenvalues to a certain extent and significantly limits the efficiency and performance of memristor-based reservoir computing for complex ***,this work firstly reports an artificial light-emitting synaptic(LES)device with dual photoelectric output for reservoir computing,and a reservoir system with mixed physical nodes is *** system effectively transforms the input signal into two eigenvalue outputs using a mixed physical node reservoir comprising distinct physical quantities,namely optical output with nonlinear optical effects and electrical output with memory *** previously reported memristor-based reservoir systems,which pursue rich reservoir states in one physical dimension,our mixed physical node reservoir system can obtain reservoir states in two physical dimensions with one input without increasing the number and types of *** recognition rate of the artificial light-emitting synaptic reservoir system can achieve 97.22%in MNIST ***,the recognition task of multichannel images can be realized through the nonlinear mapping of the photoelectric dual reservoir,resulting in a recognition accuracy of 99.25%.The mixed physical node reservoir computing proposed in this work is promising for implementing the development of photoelectric mixed neural networks and material-algorithm collaborative design.

关键词： reservoir mixed system

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Wide-temperature range and high safety electrolytes for highvoltage Li-metal batteries

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Nano Research 2023年第6期16卷 8260-8268页

作者： Anran Pan Zhicheng Wang Fengrui Zhang Lei Wang Jingjing Xu Jieyun Zheng Jianchen Hu Chenglong Zhao Xiaodong Wu i-lab Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Nano Science and Technology Institute University of Science and Technology of ChinaHefei 230026China Institute of Physics Chinese Academy of SciencesBeijing 100190China College of Textile and Clothing Engineering Soochow UniversitySuzhou 215123China Phylion battery Co. Ltd.Suzhou 215123China

Along with the keeping growing demand for high-energy-density energy storage system,high-voltage Li-metal batteries(LMBs)have attracted many *** view of many defects of the commercial electrolytes,such as flammability,limited operation temperature range,and severe Li dendrite growth,non-flammable phosphate-based localized highly concentrated electrolytes(LHCE)have been explored as one of the safe electrolytes for *** until now there is rare report on wide-temperature range LMBs using phosphate-based ***,we prepare a wide-temperature LHCE,which is composed of lithium difluoro(oxalato)borate(LiDFOB),triethyl phosphate(TEP),and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether(HFE),and explore the applicability in wide-temperature LMBs from−40 to 70℃.In the LHCE,both TEP and HFE are non-flammable,and Li^(+) is highly coordinated with TEP and DFOB^(−),which can effectively inhibit the TEP decomposition on anode,and facilitate the preferential reduction of DFOB^(−),thus obtain a robust solid electrolyte interphase(SEI)to suppress Li dendrite growth and side ***,this LHCE can not only endow Li/Cu and Li/Li cells with high Coulombic efficiency(CE)and long cycling lifespan,but also be applied to LiFePO_(4)(LFP)/Li and LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)/Li *** importantly,the NCM523/Li LMBs with LHCE can deliver stable cycling performance at 4.5 V high-voltage and high-temperature(70℃),as well as excellent low-temperature capacity retention even though both charging and discharging process were carried out at−40℃.

关键词： safe electrolytes wide-temperature non-flammable high-voltage batteries

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pH modulation and molecular layer construction for stable zinc batteries

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Journal of Energy Chemistry 2025年第3期102卷 179-188页

作者： Donghong Wang Qiwang Shao Xianjia Cao Mengxuan Qin Yizhu He Lei Zhu Qing Li Dongming Liu School of Materials Science and Engineering Anhui Province Key Laboratory of Efficient Conversion and Solid-State Storage of Hydrogen&ElectricityAnhui University of TechnologyMa'anshan 243032AnhuiChina Anhui Key Lab of Metal Material and Processing Ma'anshan 243002AnhuiChina School of Chemistry and Chemical Engineering Anhui University of TechnologyMa'anshan 243032AnhuiChina Institute of Applied Physics and Materials Engineering University of MacaoMacao 99078China

Aqueous zinc-ion batteries(AZIBs)have regained interest due to their inherent safety and ***,the zinc anode is notorious for side reactions and dendrite growth,which plague the practical application of *** the interfacial pH to reduce the by-products has been proven to be effective in protecting the zinc ***,the dynamic regulation of the inherently unstable zinc interface during prolonged cycling remains a significant ***,zwitterionic N-tris(hydroxymethyl)methylglycine(TMG)integrated with negative-COO^(-)and positive NH_(2)^(+)groups is proposed to stabilize the Zn anode and extend the lifespan as a self-regulating interfacial *** anionic portion serves as a trapping site to balance the interfacial pH and thus mitigate the unintended side ***,the NH_(2)^(+)cations are anchored on the zinc surface,forming a water-shielding,zincophilic molecular layer that guides three-dimensional diffusion and promotes uniform ***,an average plating efficiency of 99.74%over 3300 cycles at a current density of2 mA cm^(-2)is ***,the TMG additive actualizes ultralong life in Zn‖Zn symmetrical cells(5500 h,exceeding 229 days,1 mA cm^(-2)/1 mA h cm^(-2)),and enables the Zn‖I_(2)cells to reach capacity retention rate of 89.4%after 1000 cycles at 1 A g^(-1).

关键词： Aqueous zinc ion battery Zn dendrites pHDynamic regulation Molecular layer Zn-12

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