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Side-Chain-Type Polyimide-Cu Complexes with Suppressed Activation Energy of relaxation for Advanced High-Temperature Capacitor

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Chinese Journal of Polymer Science 2024年第8期42卷 1038-1048页

作者： Bai-Yang Zhou Ze-Tong Ma Shi-Long Zhong Zhen-Jie Huang Qi Guo deng-Chong Feng Zhong-Ke Yuan Shao-Lin Lu Yu-Zhao Yang Cheng Wang ding-Shan Yu Xu-dong Chen key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Guangdong Engineering Technology Research Centre for High Performance Organic and Polymer Photoelectric Functional FilmsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Laboratory of Chemistry and Fine Chemical Industry Jieyang Centre Jieyang 515200China Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515031China

The burgeoning growth of the new energy vehicles and aviation industry has escalated the need for energy storage capacitors capable of stable operation in harsh *** advent of metal-polyimide complexes has illuminated a novel approach for preparing tem perature-resistant ***,the general application of these metal-polyimide com plexes is impeded by the high dielectric loss and low breakdown strength,consequences of main-chain coordination and excessive metal ions ***,our study proposes a novel polyimideCu complex material(POP-Cu)predicated on side-chain-type pyridine-Cu coordination,utilizing the structural backbone PMdA-OdA of mature commercial PI(Kapton)with reliable *** to the high degree of freedom afforded by the side chain with suppressed relaxation activation energy and the long-range electron delocalization formed by d-πcoordination,the dielectric constant of this material containing merely 2.7 mol%Cu increases from 3.25(POPI)to 5.58,while maintaining a remarkably low dielectric loss of ***,this material exhibits a substantial dC breakdown strength of 436.2 MV·m^(-1)and a high energy density of 5.42 J·cm^(-3),coupled with superior mechanical and thermal *** at 150℃,it retains over 90%of its room-temperature energy density,demon strating notable dielectric stability under high *** attributes underscore its promising application for capacitors operating in harsh environments.

关键词： dielectric performance Polyimide complexes Side-Chain-Type High-temperature capacitor

A lateral AlGaN/GaN Schottky barrier diode with 0.36-V turn-on voltage and 10-kV breakdown voltage by using double-barrier anode structure

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Chip 2024年第1期3卷 35-42页

作者： ru Xu Peng Chen Xiancheng Liu Jianguo Zhao Tinggang Zhu dunjun Chen Zili Xie Jiandong Ye Xiangqian Xiu Fayu Wan Jianhua Chang rong Zhang Youdou Zheng The key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210023China School of Electronic and Information Engineering Nanjing University of Information Science and TechnologyNanjing 210044China Corenergy Semiconductor Incorporation Suzhou 215600China

GaN power electronic devices,such as the lateral AlGaN/GaN Schottky barrier diode(SBd),have received significant attention in recent *** studies have focused on optimizing the breakdown voltage(BV)of the device,with a particular emphasis on achieving ultra-high-voltage(UHV,>10 kV)***,another important question arises:can the device maintain a BV of 10 kV while having a low turn-on voltage(V_(on))?In this study,the fabrication of UHV AlGaN/GaN SBds was demonstrated on sapphire with a BV exceeding 10 ***,by utilizing a doublebarrier anode(dBA)structure consisting of platinum(Pt)and tantalum(Ta),a remarkably low Von of 0.36 V was *** achievement highlights the great potential of these devices for UHV applications.

关键词： AlGaN/GaN Schottky barrier diode double-barrier anode Turn-on voltage Ultra-high-voltage

Absence of metallicity and bias-dependent resistivity in low-carrier-density EuCd_(2)As_(2)

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 119-125页

作者： Yuxiang Wang Jianwen Ma Jian Yuan Wenbin Wu Yong Zhang Yicheng Mou Jiaming Gu Peihong Cheng Wu Shi Xiang Yuan Jinglei Zhang Yanfeng Guo Cheng Zhang State key Laboratory of Surface Physics and Institute for Nanoelectronic devices and Quantum Computing Fudan UniversityShanghai 200433China School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China State key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200241China Anhui Province key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of SciencesHefei 230031China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China Zhangjiang Fudan International Innovation Center Fudan UniversityShanghai 201210China Shanghaitech Laboratory for Topological Physics Shanghai 201210China

EuCd_(2)As_(2)was theoretically predicted to be a minimal model of Weyl semimetals with a single pair of Weyl points in the ferromagnet ***,the heavily p-doped Eu Cd_(2)As_(2)crystals in previous experiments prevent direct identification of the semimetal ***,we present a comprehensive magneto-transport study of high-quality Eu Cd_(2)As_(2)crystals with ultralow bulk carrier density(10^(13)cm^(-3)).In contrast to the general expectation of a Weyl semimetal phase,Eu Cd_(2)As_(2)shows insulating behavior in both antiferromagnetic and ferromagnetic states as well as surface-dominated conduction from band ***,the application of a dc bias current can dramatically modulate the resistance by over one order of magnitude,and induce a periodic resistance oscillation due to the geometric *** nonlinear transport results from the high nonequilibrium state induced by an electrical field near the band *** results suggest an insulating phase in Eu Cd_(2)As_(2)and put a strong constraint on the underlying mechanism of anomalous transport properties in this system.

关键词： magnetic Weyl semimetal quantum transport Hall effect nonlinear resistivity

Two-dimensional Sb net generated nontrivial topological states in SmAgSb_(2) probed by quantum oscillations

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Chinese Physics B 2024年第7期33卷 51-58页

作者：袁健石贤彪杜红李田郗传英王霞夏威王保田钟瑞丹郭艳峰 School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Xingzhi College Zhejiang Normal UniversityJinhua 321100China Anhui Province key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of SciencesHefei 230031China Shanghaitech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China

The rEAgSb_(2)(rE = rare earth and Y) family has drawn considerable research interest because the two-dimensional Sb net in their crystal structures hosts topological fermions and hence rich topological properties. We report herein the magnetization and magnetotransport measurements of SmAgSb_(2) single crystal, which unveil very large magnetoresistance and high carrier mobility up to 6.2 × 10^(3)% and 5.58 × 10^(3)cm^(2)·V^(-1)·s^(-1), respectively. The analysis of both Shubnikov–de Haas and de Haas–van Alphen quantum oscillations indicates nontrivial Berry phases in the paramagnetic state while trivial Berry curvature in the antiferromagnetic state, indicating a topological phase transition induced by the antiferromagnetic order. It is also supported by the first-principles calculations. The results not only provide a new interesting topological material but also offer valuable insights into the correlation between magnetism and nontrivial topological states.

关键词： large magnetoresistance quantum oscillations topological phase transition

In Situ Polymer Gel Electrolyte in Boosting Scalable Fibre Lithium Battery Applications

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Nano-Micro Letters 2024年第11期16卷 170-173页

作者： Jie Luo Qichong Zhang key Laboratory of Multifunctional Nanomaterials and Smart Systems Chinese Academy of SciencesSuzhou Institute of Nano-Tech and Nano-Bionics398 Ruoshui RoadSuzhou 215123People’s Republic of China

The poor interfacial stability not only deteriorates fibre lithium-ion batteries(FLBs)performance but also impacts their scalable *** efficiently address these challenges,*** Peng team proposed a generalized channel structures strategy with optimized in situ polymerization technology in their recent *** resultant FLBs can be woven into different-sized powering textiles,providing a high energy density output of 128 Wh kg^(-1) and simultaneously demonstrating good durability even under harsh *** a promising strategy expands the horizon in developing FLB with particular polymer gel electrolytes,and significantly ever-deepening understanding of the scaled wearable energy textile system toward a sustainable future.

关键词： High-performance fibre lithium batteries Gel electrolytes Channel structures Stable interface Scalable application

Geobacter sulfurreducens promoted the biosynthesis of reduced graphene oxide and coupled it for nitrobenzene reduction

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Journal of Environmental Sciences 2024年第4期138卷 458-469页

作者： Shoujuan Zhang Qi Liu Linrui Zhong Jianhong Jiang Xiaozhe Luo Xingxin Hu Qian Liu Yue Lu College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Shenzhen research Institute Hunan UniversityShenzhen 510082China key Laboratory of Environment Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China China Machinery International Engineering design&research Institute Co. LtdChangsha 410007China Hunan Engineering research Center for Water Treatment Process&Equipment Changsha 410007China

In order to explore an efficient and green method to deal with nitrobenzene(NB)pollutant,reduced graphene oxide(r GO)as an electron shuttle was applied to enhance the extracellular electron transfer(EET)process of Geobacter sulfurreducens,which was a typical electrochemically active bacteria(EAB).In this study,r GO biosynthesis was achieved via the reduction of graphene oxide(GO)by *** PCA within 3 ***,the r GOPCA combining system completely reduced 50-200μmol/L of NB to aniline as end product within one *** characterization revealed that PCA cells were partly wrapped by rGO,and therefore the distance of electron transfer between strain PCA and r GO material was ***,the Id/IGof GO,r GO,and r GO-PCA combining system were 0.990,1.293 and 1.31,***,highest currents were observed in r GO-PCA-NB as 12.950μA/-12.560μA at -408 m V/156 m V,attributing to the faster electron transfer efficiency in EET ***,the NB reduction was mainly due to:(I)direct EET process from *** PCA to NB;(II)r GO served as electron shuttle and accelerated electron transfer to NB,which was the main degradation ***,the biosynthesis of r GO via GO reduction by Geobacter promoted the NB removal process,which provided a facile strategy to alleviate the problematic nitroaromatic pollution in the environment.

关键词： reduced graphene oxide Geobacter Nitrobenzene removal Extracellular electron transfer

Tourmaline guiding the electric field and dechlorination pathway of 2,3-dichlorophenol by desulfitobacterium hafniense

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Journal of Environmental Sciences 2024年第1期135卷 262-273页

作者： Yue Lu Fangyi Liang Fanzhi Qin Linrui Zhong Jianhong Jiang Qi Liu Shoujuan Zhang Ming Yan Changzheng Fan Haoran dong College of Environmental Science and Engineering Hunan UniversityChangsha 410082China Shenzhen research Institute Hunan UniverisyShenzhen 510082China key Laboratory of Environment Biology and Pollution Control Hunan UniversityMinistry of EducationChangsha 410082China China Machinery International Engineering design&research Institute Co. Ltd.Changsha 410007China Hunan Engineering research Center for Water Treatment Process&Equipment Changsha 410007China

The dehalogenation of organohalides has been a research hotspot in bioremediation field;however,the influence of tourmaline,a natural ore that can generate spontaneous electric field,on organohalide-respiring bacteria(OHrB)and their dechlorination process is not well *** this study,the effect and mechanism of tourmaline on the reductive dechlorination of 2,3-dichlorophenol(2,3-dCP)by desulfitobacterium hafniense dCB-2Twere *** characterization results confirmed that tourmaline had good stability and the optimal dosage of tourmaline was 2.5 g/L,which shortened the total time required for dechlorination reaction to 72 ***,tourmaline amendment also increased the proportion of 2-chlorophenol(2-CP)from 18%to 30%of end products,while that of 3-CP decreased *** theoretical calculations showed that the bond charge of the orthosubstituted chlorine declined from-0.179 to-0.067,and that of meta-substituted chlorine increased from-0.111 to-0.129,which indicated that the spontaneous electric field of tourmaline affected the charge distribution of 2,3-dCP and was more conducive to the generation of ***,tourmaline with the spontaneous electric field affected the reductive dechlorination pathway of desulfitobacterium,and the tourmaline-OHrB combining system might serve as a novel strategy for the bioremediation of environments polluted with chlorinated phenols.

关键词： reductive dechlorination desulfitobacterium hafniense Tourmaline Electric field 2 3-dichlorophenol

Glucagon-like peptide-1 receptor agonists rescued diabetic vascular endothelial damage through suppression of aberrant STING signaling

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Acta Pharmaceutica Sinica B 2024年第6期14卷 2613-2630页

作者： Xuemin He Siying Wen Xixiang Tang Zheyao Wen rui Zhang Shasha Li rong Gao Jin Wang Yanhua Zhu dong Fang Ting Li ruiping Peng Zhaotian Zhang Shiyi Wen Li Zhou Heying Ai Yan Lu Shaochong Zhang Guojun Shi Yanming Chen department of Endocrinology and Metabolic diseases the Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China Guangdong Provincial key Laboratory of diabetology&Guangzhou Municipal key Laboratory of Mechanistic and Translational Obesity research the Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China VIP Medical Service Center the Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China department of Clinical Immunology the Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China department of Ophthalmology the Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China State key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangzhou 510060China department of Fundus Shenzhen Eye Hospital of Jinan UniversityShenzhen 518048China

Glucagon-like peptide-1 receptor agonists(GLP-1 rAs)protect against diabetic cardiovascular diseases and ***,their activity in diabetic retinopathy(dr)remains *** retrospective cohort study involving 1626 T2dM patients revealed superior efficacy of GLP-1 rAs in controlling dr compared to other glucose-lowering medications,suggesting their advantage in dr *** single-cell rNA-sequencing analysis and immunostaining,we observed a high expression of GLP-1r in retinal endothelial cells,which was down-regulated under diabetic *** of GLP-1 rAs significantly restored the receptor expression,resulting in an improvement in retinal degeneration,vascular tortuosity,avascular vessels,and vascular integrity in diabetic *** and GSEA analyses further implicated enhanced mitochondrial gene translation and mitochondrial functions by GLP-1 ***,the treatment attenuated STING signaling activation in retinal endothelial cells,which is typically activated by leaked mitochondrial *** of STING mrNA was positively correlated to the levels of angiogenic and inflammatory factors in the endothelial cells of human fibrovascular *** investigation revealed that the cAMP-responsive element binding protein played a role in the GLP-1r signaling pathway on suppression of STING *** study demonstrates a novel role of GLP-1 rAs in the protection of diabetic retinal vasculature by inhibiting STING-elicited inflammatory signals.

关键词： GLP-1 rAs STING signaling retinal endothelial cells Mitochondrial leakage retinal vascular dysfunction diabetic retinopathy CrEB Inflammation

Gd_(3)Al_(3)Ga_(2)O_(12):Ce^(3+), Yb^(3+) fluorescent ceramic with highly increased trap density for optical information storage

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Chinese Optics Letters 2024年第7期22卷 59-65页

作者： Jiaocheng Yin renjie Jiang Junwei Zhang Qiao Hu Miao Zhao Xiaoxia Wang Anlian Pan Hao ruan College of Materials Science and Engineering Hunan UniversityChangsha 410082China Photonic Integrated Circuits Center Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Electron-trapping materials,due to their exceptional ability of energy storage and controllable photon release under external stimulation,have attracted considerable attention in the field of optical information storage(OIS).In this work,Gd_(3)Al_(3)Ga_(2)O_(12):Ce^(3+), Yb^(3+)fluorescent ceramics,were developed using air and vacuum sintering *** co-doping Ce^(3+)and Yb^(3+),the trap density was significantly increased by 7.5 times compared to samples containing only Ce^(3+).Vacuum annealing further enhanced trap density by 1.6 times compared to samples sintered solely in air,while generating deep traps(1.44 eV),making Gd_(3)Al_(3)Ga_(2)O_(12):Ce^(3+), Yb^(3+) an excellent OIS *** work is expected to facilitate the development of OIS materials.

关键词： electron-trapping materials optical information storage Gd_(3)Al_(3)Ga_(2)O_(12):Ce^(3+),Yb^(3+) two-step sintering method.