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Microfluidic synthesis of hollow CsPbBr_(3) perovskite nanocrystals through the nanoscale Kirkendall effect

Nano Research 2024年第9期17卷 8487-8494页

作者： Yue Chen Xiaoyu Zhang Jinzhou Jiang Gaoyu Chen Kunhong Zhou Xinwen Zhang Fajing Li Caojin Yuan Jianchun Bao Xiangxing Xu Jiangsu Collaborative Innovation Center of Biomedical Functional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China Key Laboratory for Organic Electronics and Information Displays Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China Frontiers Science Center for Flexible Electronics Institute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi’an 710072China Jiangsu Key Laboratory for Opto-Electronic Technology School of Physics and TechnologyNanjing Normal UniversityNanjing 210023China State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China

All inorganic metal halide perovskite nanocrystals(NCs)have attracted much attention for their outstanding optoelectronic properties,which can be tuned by the composition,surface,size and morphology in ***,we report the microfluidic synthesis of hollow CsPbBr_(3)perovskite NCs through the nanoscale Kirkendall *** formation mechanism of the hollow structure(Kirkendall void)controlled by the temperature,flow rate,ratios of precursors and ligands was *** with the solid CsPbBr_(3)NCs of the same size,the hollow CsPbBr_(3)NCs exhibit blue shifts in ultraviolet-visible(UV-vis)absorption and photoluminescence(PL)spectra,and remarkably longer PL average lifetime(~98.2 ns).Quantum confinement effect,inner surface induced additional trap states and lattice strain of the hollow CsPbBr_(3)NCs were discussed in understanding their unique optoelectronic *** hollow CsPbBr_(3)NC based photodetector exhibits an outstanding negative photoconductivity(NPC)detectivity of 8.9×10^(12)*** also show potentials in perovskite NC based photovoltaic and light emitting diodes(LEDs).

关键词： perovskite nanocrystals hollow nanocrystals nanoscale Kirkendall effect microfluidic synthesis

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Relay C(sp^(3))-H bond trifluoromethylthiolation and amidation by visible light photoredox catalysis

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Science China Chemistry 2024年第11期67卷 3844-3850页

作者： Junheng Liu Suqi Yang Shunruo Yao Chengjian Zhu Yong Liu Weipeng Li Jin Xie State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic MaterialsChemistry and Biomedicine Innovation Center(ChemBIC)School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryShanghai 200032China Nanjing Bready Advanced Materials Technology Co. Ltd.Nanjing 221100China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 211198China

Selective functionalization of C(sp^(3))–H bonds is a straightforward and practical method to construct complex molecule skeletons. In this field, direct transformation of unactivated C(sp^(3))–H bonds into C(sp^(3))–SCF_(3) architectures is still a great *** report a highly selective trifluoromethylthiolation of unactivated aliphatic C(sp^(3))–H bonds by combination of proton-coupled electron transfer(PCET) and hydrogen atom transfer(HAT) strategy. A wide range of structurally diverse alkyl trifluoromethyl sulfides are obtained. Furthermore, the use of two different photocatalysts can realize an unprecedented trifluoromethylthiolation and amidation cascade of different C(sp^(3))–H bonds. It can afford a good access to bifunctionalized molecules in synthetically useful yields.

关键词： photoredox catalysis C–H activation trifluoromethylthiolation amidation PCET

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The Journey/DAO/TAO of Embodied Intelligence: From Large Models to Foundation Intelligence and Parallel Intelligence

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1313-1316页

作者： Tianyu Shen Jinlin Sun Shihan Kong Yutong Wang Juanjuan Li Xuan Li Fei-Yue Wang College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China State Key Laboratory for Turbulence and Complex Systems Department of Advanced Manufacturing and RoboticsCollege of EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Peng Cheng Laboratory Shenzhen 518000China State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190 Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China IEEE

THE tremendous impact of large models represented by ChatGPT[1]-[3]makes it necessary to con-sider the practical applications of such models[4].However,for an artificial intelligence(AI)to truly evolve,it needs to possess a physical“body”to transition from the virtual world to the real world and evolve through interaction with the real *** this context,“embodied intelligence”has sparked a new wave of research and technology,leading AI beyond the digital realm into a new paradigm that can actively act and perceive in a physical environment through tangible entities such as robots and automated devices[5].

关键词： Intelligence DAO TAO

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Physical Layer Encryption of OFDM-PON Based on Quantum Noise Stream Cipher with Polar Code

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China Communications 2024年第3期21卷 174-188页

作者： Xu Yinbo Gao Mingyi Zhu Huaqing Chen Bowen Xiang Lian Shen Gangxiang Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network Technologythe School of Electronic and Information EngineeringSoochow UniversityNo.1 Shizi StreetSuzhou 215006China

Orthogonal frequency division multiplexing passive optical network(OFDM-PON) has superior anti-dispersion property to operate in the C-band of fiber for increased optical power budget. However,the downlink broadcast exposes the physical layer vulnerable to the threat of illegal eavesdropping. Quantum noise stream cipher(QNSC) is a classic physical layer encryption method and well compatible with the OFDM-PON. Meanwhile, it is indispensable to exploit forward error correction(FEC) to control errors in data transmission. However, when QNSC and FEC are jointly coded, the redundant information becomes heavier and thus the code rate of the transmitted signal will be largely reduced. In this work, we propose a physical layer encryption scheme based on polar-code-assisted QNSC. In order to improve the code rate and security of the transmitted signal, we exploit chaotic sequences to yield the redundant bits and utilize the redundant information of the polar code to generate the higher-order encrypted signal in the QNSC scheme with the operation of the *** experimentally demonstrate the encrypted 16/64-QAM, 16/256-QAM, 16/1024-QAM, 16/4096-QAM QNSC signals transmitted over 30-km standard single mode fiber. For the transmitted 16/4096-QAM QNSC signal, compared with the conventional QNSC method, the proposed method increases the code rate from 0.1 to 0.32 with enhanced security.

关键词： physical layer encryption polar code quantum noise stream cipher

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Suppression of thermal transport in bent boron arsenide nanoribbons

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Physical Review Applied 2024年第5期22卷 054019页

作者： Guanbo Jiao Shuo Qiao Jun Lyu Yi Tao Lin Yang Department of Advanced Manufacturing and Robotics College of Engineering School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments National Key Laboratory of Advanced Micro and Nano Manufacture Technology

Boron arsenide (BAs) has emerged as a strong contender for next-generation functional materials, boasting desirable attributes such as high thermal conductivity and ambipolar mobility. However, a critical yet underexplored challenge lies in understanding its heat conduction capabilities under inhomogeneous strain, which is pivotal across various functional devices and operational conditions. Here, through modeling thermal transport in bent BAs and Si nanoribbons, a striking difference is revealed. Namely, the BAs nanoribbons exhibit nearly twice the reduction in thermal conductivity compared with Si under identical bending conditions. This significant disparity is driven by two key factors: the pronounced effect of phonon-spectra broadening under strain and the inhomogeneous strain-induced narrowing of the acoustic and optical (ao) gap. Together, these factors relax the originally restricted phonon scattering phase space and fundamentally alter phonon scattering dynamics. Our findings not only offer a new perspective on how heat transfer can be dynamically modulated in BAs, but also provide crucial insights into enhancing thermal performance in BAs-based functional devices.

关键词： Anharmonic lattice dynamics Bending Heat transfer Phonons Strain Thermal conductivity Nanoribbon Molecular dynamics

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Recent advances on liquid intercalation and exfoliation of transition metal dichalcogenides: From fundamentals to applications

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Nano Research 2024年第3期17卷 2088-2110页

作者： Yan Tu Lingbin Xie Mengyang Zhang Shujuan Liu Zhongzhong Luo Longlu Wang Qiang Zhao State Key Laboratory of Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology) Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and DevicesNanjing University of Posts and TelecommunicationsNanjing 210023China

The weak van der Waals gap endows two dimensional transition metal dichalcogenides(2D TMDs)with the potential to realize guest intercalation and host ***,the liquid intercalation and exfoliation is a facile,low-cost,versatile and scalable strategy to modulate the structure and physiochemical property of TMDs via introducing foreign species into *** this review,firstly,we briefly introduce the resultant hybrid superlattice and disperse nanosheets with tailored properties fabricated via liquid intercalation and ***,we systematically analyze the intercalation phenomenon and limitations of various intercalants in chemical or electrochemical ***,we intensely discuss diverse functionalities of resultant materials,focusing on their potential applications in energy conversion,energy storage,water purification,electronics,thermoelectrics and ***,we highlight the challenges and outlooks for precise and mass production of 2D TMDs-based materials via liquid intercalation and *** review enriches the overview of liquid intercalation and exfoliation strategy,and paves the path for relevant high-performance devices.

关键词： two-dimensional transition metal dichalcogenides hybrid superlattice intercalation exfoliation

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Reversibly sensitizing-storing-releasing ^(1)O_(2) within a single platinum(Ⅱ)-acetylide-based metallacycle molecule via laser power modulation

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Science China Chemistry 2024年第2期67卷 604-611页

作者： Ruyi Zhou Wen Lv Bo Li Bo Yu Sudi Zhang Yucheng Zhou Shujuan Liu Qiang Zhao State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)&Institute of Flexible Electronics(Future Technology)Nanjing University of Posts and Telecommunications(NUPT)Nanjing210023China College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Jiangsu Province Engineering Research Center for Fabrication and Application of Special Optical Fiber Materials and DevicesNanjing University of Posts and Telecommunications(NUPT)Nanjing210023China

Tumor hypoxia severely limits the therapeutic efficacy of photodynamic therapy(PDT) for solid tumors,which is highly dependent on tissue oxygen *** this study,we developed a platinum(Ⅱ)-acetylide-based metallacycle compound bearing six 1,4-dimethylnaphthalenes(DMN) groups,and controlled the photodynamic and photothermal effects of the compound by adjusting the power of 730 nm laser to achieve reversible sensitization,storage and release of 1~O_(2) within a single *** compound formed nanoparticles by self-assembly and exhibited good water solubility and *** laser irradiation,the strong spin-orbit coupling of platinum atoms in the metallacycle facilitated 1~O_(2) *** produced 1~O_(2) was captured by the DMN carriers and transported into the hypoxic tumor,where 1~O_(2) release was triggered owing to the good photothermal effect of the extended conjugation of the *** therapy,the metallacycle serving as a photosensitizer,1~O_(2) carrier,and photothermal reagent,achieved the synergistic therapy of PDT/PTT,demonstrating the versatility of the *** study proposes a new strategy to develop phototherapy agents that are suitable for hypoxic tumors.

关键词： metallacycles singlet oxygen endoperoxides near-infrared absorption synergistic treatment

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Anisotropic phonon dynamics in Dirac semimetal PtTe2 thin films enabled by helicity-dependent ultrafast light excitation

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Light(Science & Applications) 2024年第9期13卷 1888-1897页

作者： Ziyang Li Yequan Chen Anke Song Jinzhong Zhang Rong Zhang Zongzhi Zhang Xuefeng Wang Key Laboratory of Micro and Nano Photonic Structures(MOE) School of Information Science and TechnologyFudan UniversityShanghaiChina Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials State Key Laboratory of Spintronics Devices and TechnologiesSchool of Electronic Science and EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingChina Department of Physics School of Physics and Electronic ScienceEast China Normal UniversityShanghaiChina Department of Physics Xiamen UniversityXiamenChina

Coherent phonons have aroused considerable attention in condensed matter physics owing to their extraordinary capacity of reflecting and controlling the physical properties of ***,the investigation on the interaction between coherent phonons and other microscopic particles on the ultrafast timescale within topological systems continues to be an active and unresolved ***,we show the energy transfer of coherent optical phonons(COP)in Dirac semimetal PtTe2 thin films using ultrafast optical pump-probe ***,the helicitydependent light-driven anisotropic COP signals disclose their direct connection with the light-excited anisotropic spinpolarized electrons via an angular momentum ***,we observe the notable decreases in the COP oscillation frequency and the decay rate with increasing temperatures due to the anharmonic phonon-phonon scattering and electron-phonon scattering in the COP dissipation process,*** work paves the way for uncovering the coherent phonons in Dirac semimetals for the potential applications in optoelectronics and optospintronics.

关键词： spectroscopy phonon Dirac

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Palladium-catalyzed annulative allylic alkylation for regioselective construction of indole-fused medium-sized cyclic etherS

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Chinese Chemical Letters 2023年第12期34卷 155-158页

作者： Ling-Qi Chen Chi-Fan Zhu Su Zhang Bao-Yang Liu Shu-Jjiang Tu Wen-Jjuan Hao Bo Jiang School of Chemistry&Materials Science Jiangsu Normal UniversityXuzhou 221116China jiangsu Key Laboratory of Advanced Catalytic Materials&Technology School of PharmacyChangzhou UniversityChangzhou 213164China

A new palladium-catalyzed annulative allylic alkylation(AAA)reaction of 2-(indol-2-yl)phenols with dual allylic electrophiles such as isobutylene dicarbonate and butene dicarbonate is described,leading to the regioselective synthesis of tetracyclic medium-sized cyclic ethers possessing a bridged aryl-indole scaf-fold,namely,benzo[2,3]oxocino[4,5-b]indoles and benzo[2,3]oxepino[4,5-b]indoles,in good to excellent *** protocol demonstrates a broad substrate scope,good compatibility with substituents and high regioselectivity,providing a catalytic and flexible method for creating bridged aryl-indole skeletons.

关键词： Palladium-catalysis Annulative allylic alkylation [5+n]annulation Regioselectivity Medium-sized cyclic ethers

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Vertical two-dimensional WS_(2)flakes grown on flexible CNT film for excellent electrochemical performance

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Rare Metals 2024年第1期43卷 164-174页

作者： Qian Gong Jing-Yun Zou Ming Ren Si-Qi Zhu Yu-Rong Zhou Li-Ming Zhao Jian Chen Yu-Long Wu Jiang-Tao Di Li-Xing Kang Qing-Wen Li School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Division of Advanced MaterialsSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China

Soft electrochemical actuators that can generate mechanical motions in response to electrical stimuli can be used as artificial muscles in microscale *** electrode materials are the key component of the electrochemical actuator because they limit the ion diffusion and accumulation processes and thus affect the deformation in fast response-time and potential engineering ***-dimensional materials,such as one-dimensional(1D)CNT and two-dimensional(2D)vertically stood WS_(2),are great electrode due to their good electrochemical stability and high surface-to-volume ratios,but show limited performances when being used on their own in the actuators because of low reconstruction or low conductivity.A combination of 1D CNT and 2D WS_(2)could form a heterojunction with both high electrochemical activity and great mechanical ***,by depositing highly disordered graphene nanosheets(HDGNs)on CNT films and then WS_(2)on the formed low-dimensional nanocarbon film,a hybrid WS_(2)/HDGN/CNT film was synthesized through a multistep CVD *** grown WS_(2)nanosheets were achieved by taking advantage of HDGNs which limits CNTs ***,the volume expansion caused by the transition from WO_(3)to WS-2can force the vertical growth of WS_(2).This hybrid film shows excellent electrochemical properties,such as high specific capacitance and high rate *** actuators based on the WS_(2)/HDGN/CNT films show good actuating performance,including stability and reconfigurability.

关键词： CNT Graphene Vertically growth WS_(2) Electrochemical actuators

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