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Pulse-doubling perovskite nanowire lasers enabled by phonon-assisted multistep energy funneling

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Light(science & Applications) 2024年第8期13卷 1645-1654页

作者： Chunhu Zhao jia Guo jiahua Tao Junhao Chu Shaoqiang chen Guichuan Xing Hunan Provincial Key Laboratory of Carbon Neutrality and Intelligent Energy School of Resource&EnvironmentHunan University of Technology and Business410205 ChangshaChina engineering Research Center for Nanophotonics and Advanced Instrument Ministry of EducationSchool of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of Macao999078 MacaoChina

Laser pulse multiplication from an optical gain medium has shown great potential in miniaturizing integrated optoelectronic *** multiple quantum wells(MQWs)structures have recently been recognized as an effective gain media capable of doubling laser pulses that do not rely on external optical *** the light amplifications enabled with pulse doubling are reported based on the perovskite MQWs thin films,the micronanolasers possessed a specific cavity for laser pulse multiplication and their corresponding intrinsic laser dynamics are still ***,a single-mode double-pulsed nanolaser from self-assembled perovskite MQWs nanowires is realized,exhibiting a pulse duration of 28 ps and pulse interval of 22 ps based on single femtosecond laser pulse *** is established that the continuous energy building up within a certain timescale is essential for the multiple population inversion in the gain medium,which arises from the slowing carrier localization process owning to the stronger exciton–phonon coupling in the smaller-n ***,the double-pulsed lasing is achieved from one fast energy funnel process from the adjacent small-n QWs to gain active region and another slow process from the spatially separated *** report may shed new light on the intrinsic energy relaxation mechanism and boost the further development of perovskite multiple-pulse lasers.

关键词： doubling energy phonon

Single-atom Pd anchored in the porphyrin-center of ultrathin 2D-MOFs as the active center to enhance photocatalytic hydrogen-evolution and NO-removal

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Chinese Chemical Letters 2024年第9期35卷 364-368页

作者： Xingyan Liu Chaogang jia Guangmei jiang chenghua Zhang Mingzuo chen Xiaofei Zhao Xiaocheng Zhang Min Fu Siqi Li Jie Wu Yiming jia Youzhou he Chongqing Key Laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China school of Pharmacy North Sichuan Medical CollegeNanchong 637100China Carbon Neutrality Technology Application Research Center College of River and Ocean EngineeringChongqing Jiaotong UniversityChongqing 400074China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China National Local Joint engineering Research Center for Road engineering and Disaster Prevention and Reduction Technology in Mountainous Areas China Merchants Chongqing Communications Technology Research and Design Institute Co.Ltd.Chongqing 400067China Chongqing Culture Relics and Archaeology Research Institute Chongqing 400013China

Single-atom catalysts were widely used to treat atmospheric pollution and alleviate energy crises through ***,how to prevent the aggregation of single atoms during the preparation and catalytic processes remained a great ***,a novel ultrathin two-dimensional porphyrin-based single-atom photocatalyst Ti-MOF(abbreviated as TMPd)obtained through a simple hydrothermal synthesis strategy was used for photocatalytic hydrogen evolution and NO removal,in which the singleatom Pd tightly anchored in the center of porphyrin to ensure single-atom Pd stable *** with most reported MOFs-based photocatalysts,the TMPd showed an excellent hydrogen evolution rate(1.32 mmol g^(-1)h^(-1))and the NO removal efficiency(62%)under visible light *** high-angle annular dark-field scanning transmission electron microscope(HAADF-STEM)and synchrotron-radiation-based X-ray absorption fine-structure spectroscopy(XAFS)proved that pd in TMPd existed in an isolated state,and the atomic force microscope(AFM)proved the ultrathin morphology of *** calculations had demonstrated that single-atom Pd could serve as the active center and more effectively achieve electron transfer,indicating that single-atom Pd played a vital role in photocatalytic hydrogen *** addition,a possible photocatalytic pathway of NO removal was proposed based on ESR and in-situ infrared spectra,in which the catalysts anchored with single-atom Pd could produce more active substances and more effectively oxidize NO to NO_(2)^(-)or NO_(3)^(-).The results suggested that coordinating single-atom metal species as the active site in the center of porphyrin could be a feasible strategy to obtain various ultrathin porphyrin-based single-atom photocatalysts to acquire excellent photocatalytic performance further.

关键词： Porphyrin-based MOFs Single-atom Pd Ultrathin 2D nanosheets Hydrogen evolution NO removal

Iron-based layered double hydroxide packed with metal-organic frameworks for enhanced overall water-splitting electrocatalysis

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Tungsten 2024年第4期6卷 859-868页

作者： Long chen Yun Luo Zhi-Peng Yu Yi-Kun cheng Yang zheng Li he jia-Hao Xiong Wen-Wen Kong Key Laboratory for Green Process of Chemical engineering of xinjiang Bingtuan School of Chemistry and Chemical Engineering Shihezi University Institute of Scientific Research Luzhou North Chemistry Industry Co.Ltd International Iberian Nanotechnology Laboratory (INL) CAS Key Laboratory of Functional Materials and Devices for Special Environments Xinjiang Key Laboratory of Electronic Information Materials and Devices Center of Materials Science and Optoelectronics Engineering Xinjiang Technical Institute of Physics and Chemistry of CAS

Designing hybrid materials with numerous catalytic active sites,high specific surface area,and interfacial interactions is an effective strategy to improve electrocatalytic *** this work,iron-based metal organic frameworks（Fe-MOFs）@（Co,Ni）Fe-layered double hydroxide（LDH） is successfully constructed using the similar "MOF growing on LDH" strategy for oxygen evolution reaction and hydrogen evolution reaction in the alkaline *** synthesized hybrid materials in this particular way show excellent electrochemical overall water-splitting performance with the cell voltage of 1.62 V at10 mA·cm-2in the alkaline environment due to the optimized adsorption/desorption properties of metal ions on oxygencontaining species and interfacial effects of hybrid ***-MOFs@（Co,Ni）Fe-LDH also exhibits excellent hydrogen and oxygen production efficiency of 370 and 175 μL·min-1,*** work draws on an effective approach to the fabrication of MOF@LDH structures and provides new insights into overall water-splitting in alkaline conditions.

关键词： Electrocatalysis Interfacial interactions Layered double hydroxide Metal–organic frameworks (MOFs) Water splitting

Hyperbranched polyamidoamine protective layer with phosphate and carboxyl groups for dendrite-free Zn metal anodes

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Chinese Chemical Letters 2024年第10期35卷 495-499页

作者： Xinxiu Yan Xizhe Huang Yangyang Liu Weishang jia Hualin chen Qi Yao Tao chen Key Laboratory of General Chemistry of the National Ethnic Afairs Commission School of Chemistry and EnvironmentSouthwest Minzu UniversityChengdu 610041China Institute of smart city and inteligent transportation Southwest Jiaotong UniversityChengdu 611756China school of Materials science and engineering Guangdong University of Petrochemical TechnologyMaoming 525000China

Zinc metal is regarded as one of the most promising anodes for Zn-based batteries in next-generation energy storage ***,the dendrite growth and interfacial corrosion lead to poor reversibility and cycle life of Zn ***,we synthesize a 2-phosphate-1,2,4-butane tricarboxylic acid modified hyperbranched polyamidoamine containing rich terminal groups of phosphate and carboxyl(HPC)as modified layer for the Zn ***,the in situ acid-etching promotes the exposure of(002)Zn plane and the generated salt-polymer complexes could be adhered to the Zn anodes *** greatly favors the uniform deposition of Zn and inhibits interfacial ***,stable HPC@Zn anode plating/stripping for over 1200 h at a high areal capacity of 4 mAh/cm^(2)and a current density of 4 m A/cm^(2)is *** study provides a new avenue of hyperbranched polymer in interfacial design for highly reversible and stable Zn metal anodes.

关键词： Zn anode Znmetal batteries Surface chemistry Functional groups Hyperbranched polyamidoamine

Disparities in the Levels of Whole-Blood Epstein-Barr Virus between the Cancer and Non-Cancer Populations in Zhejiang,china

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Biomedical and Environmental sciences 2024年第9期37卷 993-1002页

作者： Qingjun jia Meichun Zeng Qi chen Hangzhou Center for Disease Control and Prevention(Hangzhou health Supervision Institution) Hangzhou 310021ZhejiangChina Department of Pathology The First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003ZhejiangChina

Objective This study aimed to investigate the prevalence of Epstein-Barr virus(EBV)infection in patients with and without *** A total of 26,648 participants who underwent whole-blood EBV DNA(WBEBV)assays between January 1,2020,and August 31,2023,were *** chi-square test was used for categorical data analysis,and R software was used to analyze the differences in EBV DNA load levels and the diagnostic capabilities of *** Positive rates were 10.2%and 25.4%for healthy controls(HC)and patients,*** positivity rate for EBV-associated neoplasms(EN)was the highest at 7.53%,followed by leukemia(Le)at 5.49%.The subgroup analysis showed that the positivity rate for abnormal proliferation or hyperplasia(APH)was 31.9%,followed by 30.5%for *** WBEBV of patients with transplants(TP),especially living-related transplants(LT),was the highest among all *** at diagnosis was used to differentiate between infectious mononucleosis(IM)and chronic active Epstein-Barr virus(CAEBV),with a sensitivity of 67.4%(95%confidence interval[CI]:57.6-75.8)and specificity of 72%(95%CI:63.3-79.3).We conclude that the prevalence of EBV infection is low in the healthy population in this region and that a high EBV load at baseline is more common in LT,IM,and Lymphocyte Leukemia(LL).Conclusion This study used a large-sample survey to characterize the prevalence of whole-blood EBV levels in various diseases,including the stages and *** EBV detection rate was higher in patients with malignant disease than in those with benign *** study provides clinicians with baseline information regarding EBV-associated diseases.

关键词： Epstein-Barr virus Epstein-Barr virus DNA Whole blood Epstein-Barr virus DNA Viral load

Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes

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Light(science & Applications) 2024年第8期13卷 1623-1630页

作者： Guo-Jing Tang Xiao-Dong chen Lu Sun Chao-heng Guo Meng-Yu Li Zhong-Tao Tian Hou-hong chen hong-Wei Wang Qi-Yao Sun Ying-Di Pan Xin-Tao he Yi-Kai Su jian-Wen Dong school of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

3-dB couplers,which are commonly used in photonic integrated circuits for on-chip information processing,precision measurement,and quantum computing,face challenges in achieving robust performance due to their limited 3-dB bandwidths and sensitivity to fabrication *** address this,we introduce topological physics to nanophotonics,developing a framework for topological 3-dB *** couplers exhibit broad working wavelength range and robustness against fabrication dimensional *** leveraging valley-Hall topology and mirror symmetry,the photonic-crystal-slab couplers achieve ideal 3-dB splitting characterized by a wavelength-insensitive scattering *** analysis confirms the superiority on broad bandwidth of 48 nm and robust splitting against dimensional errors of 20 *** further propose a topological interferometer for on-chip distance measurement,which also exhibits robustness against dimensional *** extension of topological principles to the fields of interferometers,may open up new possibilities for constructing robust wavelength division multiplexing,temperature-drift-insensitive sensing,and optical coherence tomography applications.

关键词： topological splitting insensitive

Performance Limits and Advancements in Single 2D Transition Metal Dichalcogenide Transistor

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Nano-Micro Letters 2024年第12期16卷 134-188页

作者： Jing chen Ming-Yuan Sun zhen-Hua Wang zheng Zhang Kai Zhang Shuai Wang Yu Zhang Xiaoming Wu Tian-Ling Ren hong Liu Lin Han Institute of Marine science and Technology Shandong UniversityQingdao 266237ShandongPeople’s Republic of China school of Integrated Circuits and Beijing National Research Center for information science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China BNRist Tsinghua UniversityBeijing 100084People’s Republic of China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongPeople’s Republic of China Shenzhen Research Institute of Shandong university Shenzhen 518057People’s Republic of China Shandong engineering Research Center of Biomarker and Artificial Intelligence Application Jinan 250100People’s Republic of China

Two-dimensional(2D)transition metal dichalcogenides(TMDs)allow for atomic-scale manipulation,challenging the conventional limitations of semiconductor *** capability may overcome the short-channel effect,sparking significant advancements in electronic devices that utilize 2D *** the dimension and performance limits of transistors based on 2D TMDs has gained substantial *** review provides a comprehensive investigation into these limits of the single 2D-TMD *** delves into the impacts of miniaturization,including the reduction of channel length,gate length,source/drain contact length,and dielectric thickness on transistor operation and *** addition,this review provides a detailed analysis of performance parameters such as source/drain contact resistance,subthreshold swing,hysteresis loop,carrier mobility,on/off ratio,and the development of p-type and single logic *** review details the two logical expressions of the single 2D-TMD logic transistor,including current and *** also emphasizes the role of 2D TMD-based transistors as memory devices,focusing on enhancing memory operation speed,endurance,data retention,and extinction ratio,as well as reducing energy consumption in memory devices functioning as artificial *** review demonstrates the two calculating methods for dynamic energy consumption of 2D synaptic *** review not only summarizes the current state of the art in this field but also highlights potential future research directions and *** underscores the anticipated challenges,opportunities,and potential solutions in navigating the dimension and performance boundaries of 2D transistors.

关键词： Two-dimensional transistors Dimension limits Performance limits Memory devices Artificial synapses

Impacts of Winter Eurasian Snow Cover Anomalies on the Surface Air Temperature Variability over West Asia

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Journal of Meteorological Research 2024年第4期38卷 733-748页

作者： jiarong he Siguang ZHU Haishan chen Zehua QIAO Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/International Joint Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&Technology(NUIST)Nanjing 210044 school of Atmospheric sciences Nanjing University of Information Science&TechnologyNanjing 210044

Previous research has shown that land surface thermal anomalies in West Asia(WA) can impact regional and global climate,particularly affecting china through the eastward propagation of wave ***,the factors driving these anomalies in WA have not been extensively *** on the observation data,this work focuses on examining the impacts of Eurasian winter snow cover on winter surface air temperature(SAT) variability over WA from 1978/1979 to 2017/2018 and explores the underlying physical *** results indicate that a crucial snow anomaly area extending from the Baltic Sea to eastern Ural significantly influences the winter SAT anomaly in *** anomalous increase(decrease) in winter snow cover in this key area corresponds to the anomalously warmer(cooler) SAT in *** relationship is primarily driven by the albedo effects of snow cover,where more(less)snow cover induces cooling(warming) of the overlying air,altering upper-level geopotential height and influencing the intensity,duration,and frequency of local blocking ***,changes in the air temperature above the key area modify the meridional temperature gradient(MTG) between high and low latitudes,affecting the mean zonal flow in the *** of the thermodynamic energy equation for SAT reveals that the combined effects of variations in blocking events in high latitudes and mean zonal flow in midlatitudes alter the advection of climatological temperature by anomalous winds,which is caused by the anomalous increase(decrease) of snow cover in the key ***,this leads to changes in cold advection transported to WA,contributing to the occurrence of a warmer(colder) SAT over WA in winter.

关键词： West Asia Eurasian snow surface air temperature blocking episode

Furan-derived Schiff base covalent adaptable thermosets with recyclability and anti-flammability

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Green Chemical engineering 2024年第3期5卷 364-373页

作者： Ping Zhang Shuyu jia Ruishi Xie Lin chen Ying Xiong State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologyMianyang621010China

Conventional thermosetting polymers,mostly derived from nonrenewable petroleum resources,are not reprocessable and recyclable due to their highly cross-linked three-dimensional networks and face the disadvantage of high *** solve these issues,in this study,we synthesized a novel Schiff base covalent adaptable thermoset from a furan-derived tri-aldehyde monomer(TMFP)and a furan-derived di-amine monomer(DFDA).The as-prepared TMFP-DFDA-Vitrimer exhibited superior anti-flammability with a high limiting oxygen index(LOI)of 35.0%and a UL-94 V-0 rating,which was attributed to the excellent charring ***,TMFPDFDA-Vitrimer could also be conveniently recycled by chemical decomposition under a mixed hydrochloric acid/tetrahydrofuran(HCl/THF)*** recycling for 5 times,the thermal,mechanical,and flame retardant properties of the recycled TMFP-DFDA-Vitrimer retained almost unchanged compared to the original *** work provides a prime instance to develop advanced thermosetting polymers from abundant furan-based compounds.

关键词： Furan-based compounds Vitrimer Recyclability Flame retardancy