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Interface engineering and impedance matching strategy to develop core@shell urchin-like NiO/Ni@carbon nanotubes nanocomposites for microwave absorption

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Journal of materials science & Technology 2024年第9期176卷 1-12页

作者： Tianming Jia Yanling Hao Xiaosi Qi Yongchao Rao Lei Wang Junfei Ding Yunpeng Qu Wei Zhong College of Physics Guizhou Province Key Laboratory for Photoelectrics Technology and ApplicationGuizhou UniversityGuiyang 550025China Minzu Normal University of Xingyi Xingyi 562400China National Demonstration Center for Experimental Materials Science and Engineering Education Jiangsu University of Science and Technology Zhenjiang 212003China National Laboratory of Solid State Microstructures and Jiangsu Provincial Laboratory for NanoTechnology Nanjing UniversityNanjing 210093China

It is well recognized that interfacial effect and/or impedance matching play a great impact on microwave ***,we proposed a facile strategy to take full advantage of interface engineering and impedance matching for boosting microwave absorption performance(MAPs).Three-dimensional(3D)hierarchical urchin-like core@shell structured NiO/Ni@CNTs multicomponent nanocomposites(MCNCs)were elaborately constructed and produced in high efficiency through a facile continuous chemical bath deposition,thermal treatment,and catalytic chemical vapor decomposition *** controlling the pyrolysis time,the NiO/Ni@CNTs urchin-like MCNCs with different lengths and aggregation degrees of CNTs could be selectively *** obtained results revealed that the enhanced CNT contents provided abundant interfaces and effectively aggrandized their interfacial effects,which resulted in improved polarization loss,conductivity loss,and comprehensive ***,the interfaces and impedance matching in the designed NiO/Ni@CNTs urchin-like MCNCs could be optimized by regulating the pyrolysis temperature,which further improved the comprehensive *** the designed NiO/Ni@CNTs urchin-like MCNCs could simultaneously display strong absorption capabilities,broad absorption bandwidths,and thin matching ***,our findings not only provided a simple and universal approach to produce core@shell structured magnetic carbon-based urchin-like MCNCs but also presented an interface engineering and impedance matching strategy to develop the tunable,strong absorption,broadband,lightweight high-efficiency microwave absorbers.

关键词： Urchin-like geometrical morphology NiO/Ni@CNTs multicomponent nanocomposites Core@shell structure Interface engineering Microwave absorption

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High-temperature shock-induced transformation of bulk copper into single-atom catalyst

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Nano Research 2025年第4期18卷 590-600页

作者： Renjie Fang Ji Yang Wei-Shen Song Na Yang Jie Ding Jian-Feng Li Feng Ru Fan State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringInnovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)Xiamen UniversityXiamen 361005China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China Faculty of Chemistry and Food Chemistry and Center for Advancing Electronics Dresden(CFAED) Dresden University of TechnologyDresden 01062Germany

Transforming nanoscale and bulk metals into single atoms is crucial for the scalable production of single-atom catalysts(SACs),especially during ***,conventional equilibrium heating approaches often require prolonged operation to decompose metal aggregates,leading to tedious and time-consuming procedures for synthesizing *** this study,we introduce high-temperature shock(HTS)strategy to enhance metal atomization,achieving the direct transformation of bulk copper foil into single atoms in just 0.5 s at 1700 *** HTS-produced Cu catalyst demonstrates a high content of 0.54 wt.%,comparable to those achieved by commonly reported top-down strategies,indicating that the HTS method provides a compelling alternative for synthesizing Cu SACs from bulk Cu *** analysis confirmed the synthesis of a Cu-N-C SAC with a Cu-N_(4) coordination *** Cu-N_(4) structure shows excellent catalytic performance for nitrite reduction to ammonia,achieving over 90% Faradaic efficiency across the entire working potential range and an ammonia production rate of up to 11.12 mg·cm^(-2)·h^(-1) at -1.2 V *** hydrogen electrode(RHE),surpassing other reported Cu-based ***,ab initio molecular dynamics(AIMD)simulations reveal that transient high temperatures not only promote the formation of thermodynamically favorable Cu-N bonds but also prevent excessive sintering and aggregation of metal atoms.

关键词： single-atom catalyst bulk metal foil high-temperature shock rapid conversion ammonia electrosynthesis

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Thermally activated delayed fluorescence Au-Ag-oxo nanoclusters:From photoluminescence to radioluminescence

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Aggregate 2024年第2期5卷 447-456页

作者： Peng Yuan Hansong Zhang Yang Zhou Tengyue He Sami Malola Luis Gutiérrez-Arzaluz Yingwei Li Guocheng Deng Chunwei Dong Renwu Huang Xin Song Boon K.Teo Omar F.Mohammed Hannu Häkkinen Osman.M.Bakr Nanfeng Zheng New Cornerstone Science Laboratory State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsNational and Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenChina KAUST Catalysis Center(KCC) Division of Physical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Advanced Membranes and Porous Materials Center Division of Physical Science and EngineeringKing Abdullah University of Science and Technology(KAUST)ThuwalSaudi Arabia Department of Physics and Chemistry Nanoscience CenterUniversity of JyväskyläJyväskyläFinland Department of Chemistry and Chemical Biology Harvard UniversityCambridgeMassachusettsUSA Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) XiamenChina

Thermally activated delayed fluorescence(TADF)materials have numerous applications in energy conversion and luminescent ***,they are typically achieved as metal-organic complexes or pure organic ***,we report the largest Au-Ag-oxo nanoclusters to date,Au_(18)Ag_(26)(R1COO)_(12)(R_(2)C≡C)_(24)(μ_(4)-O)_(2)(μ_(3)-O)_(2)(Au_(18_Ag_(26),where R_(1)=CH_(3-),Ph-,CHOPh-or CF3Ph-;R_(2)=Phor FPh-).These nanoclusters exhibit exceptional TADF properties,including a small S1-T1 energy gap of 55.5 meV,a high absolute photoluminescence quantum yield of 86.7%,and a microseconds TADF decay time of 1.6μs at ambient ***,Au18Ag26 shows outstanding stability against oxygen quenching and ambient *** level analysis reveals the strongπ⋯πand C-H⋯πinteractions from the aromatic alkynyl ligands and the enhancement of metal-oxygen-metal interactions by centrally coordinated O^(2−).Modeling of the electronic structure shows spatially separated highest occupied molecular orbital and lowest unoccupied molecular orbital,which promote charge transfer from the ligand shell,predominantly carboxylate ligands,to O^(2−)-embedded metal ***,TADF Au-Ag-oxo nanoclusters exhibit promising radioluminescence properties,which we demonstrate for X-ray *** work paves the way for the design of TADF materials based on large metal nanoclusters for light-emission and radioluminescence applications.

关键词： Au-Ag-oxo nanoclusters photoluminescence radioluminescence TADF X-ray imaging

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Tungsten oxide nanowires and polyaniline hybrid film-based electrochromic device with multicolor display and enhanced capacitance

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Chinese Chemical Letters 2023年第11期34卷 275-279页

作者： Yanan Chen Jiao Lei Yanling Zhai Zhijun Zhu Weitai Wu Xiaoquan Lu Institute of Molecular Metrology College of Chemistry and Chemical EngineeringQingdao UniversityQingdao 266071China Institute of Hybrid Materials National Center of International Research for Hybrid Materials TechnologyNational Base of International Science&Technology CooperationCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen 361005China

Electrochromic devices(ECDs)have exhibited promising applications in the fields of energy-saving intelligent buildings and next-generation displays because of their simple structure,low power consumption,and multicolor displays.W_(18)O_(49)/polyaniline(PANI)hybrid films are prepared and assembled to *** with pure PANI and W_(18)O_(49) films,the hybrid film exhibits superior electrochemical and electrochromic performance,including high optical modulation(70.2%),large areal capacity(79.6 mF/cm^(2)),and good capacitance *** excellent electrochemical and electrochromic performance is ascribed to the formation of the donor(PANI)-acceptor(W_(18)O_(49))pair,the porous structure in the nanowires,and the large surface area,which enhance electron delocalization of the W_(18)O_(49)/PANI,improve the ion diffusion rate,and increase the charge storage ***,benefitting from the outstanding optical,electrical,and multifunctional properties,the W_(18)O_(49)/PANI hybrid film-based ECD platform is expected to play an important role in electrochromism and energy storage.

关键词： W_(18)O_(49)/PANI Electrochromism Multifunctional devices Multicolor Energy storage

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Tailoring the microstructure,mechanical and tribocorrosion performance of (CrNbTiAlV)N_(x) high-entropy nitride films by controlling nitrogen flow

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Journal of materials science & Technology 2022年第12期107卷 172-182页

作者： Cunxiu Zhang Xiaolong Lu Cong Wang Xudong Sui Yanfang Wang Haibin Zhou Junying Hao State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Qingdao Center of Resource Chemistry and New Materials Qingdao 266000China

The(CrNbTiAlV)N_(x)high-entropy nitride films were fabricated by adjusting nitrogen flow via magnetron *** microstructure,mechanical,electrochemical and tribocorrosion performances of the films were *** results show that the films transform from amorphous to nanocrystalline structure as nitrogen flow *** nanocrystalline films show super hardness(>40 GPa)and adhesion strength(>50 N).The amorphous film has a pretty anti-corrosion in static corrosion,while not in tribocorrosion *** film deposited at nitrogen flow of 38 sccm exhibits the optimal tribocorrosion performance in artificial seawater,with the highest open circuit potential(∼−0.1 V ***/AgCl),the lowest friction coefficient(∼0.162)and wear rate(∼7.48×10^(−7)mm^(3)N^(−1)m^(−1)).

关键词： High-entropy nitride films Nitrogen flow Tribocorrosion performance Magnetron sputtering

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Carbonylation Reactions of a Metallapentalyne:Synthesis of Its Ester and Amide Derivatives

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Chinese Journal of Chemistry 2024年第22期42卷 2765-2772页

作者： Yongfa Zhu Dafa Chen Ming Luo Haiping Xia State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China Shenzhen Grubbs Institute Department of ChemistrySouthern University of Science and TechnologyShenzhenGuangdong 518055 China

Carbonylation reactions are a valuable synthetic method to construct carbonyl compounds and carbonylation reactions of aryl halides stand out as a highly significant tool for generating carbonyl substituted ***,the important reactions have never been realized in aromatic ***,we present the first carbonylation reactions of metallaaromatics,specifically alkoxycarbonylation and aminocarbonylation reactions of an *** the carbonylation process,the electronic and steric properties of nucleophiles are regarded as critical *** alcohols with bulky substituents(isopropanol)require more reaction time and tert-butyl alcohol is inert in the ***,amines,being stronger nucleophiles,exhibit divergent *** amines undergo aminocarbonylation,whereas small amines prefer direct nucleophilic *** experiments revealed that the intermediate derived from coupling of metal carbyne with CO plays a significant role in the carbonylation *** to these observations,a divergent pathway for the reaction is ***,the photophysical properties of these carbonyl-functionalized osmapentalene complexes are studied,and the maximum absorption peak of compound with a carboxylic group exhibits a significant red-shift due to the smaller HOMO-LUMO *** findings contribute to expanding the reactivity of metallaaromatics and offer new opportunities for the synthesis of carbonyl-functionalized metallacycles.

关键词： Carbonylation reactions Metal carbyne Aromaticity Carbon monoxide Metallacycle

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Simultaneously Optimizing Molecular Stacking and Phase Separation via Solvent-solid Hybrid Additives Enables Organic Solar Cells with over 19%Efficiency

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Chinese Journal of Chemistry 2024年第24期42卷 3234-3242页

作者： Haicui Liu Keli Shi Jing Lai Seonghun Jeong Can Zhu Jinyuan Zhang Zhi-Guo Zhang Changduk Yang Beibei Qiu Yongfang Li Key Laboratory of Solid State Optoelectronic Devices of Zhejiang Province College of Physics and Electronic Information EngineeringZhejiang Normal UniversityJinhuaZhejiang 321004China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China School of Energy and Chemical Engineering Perovtronics Research CenterLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)50 UNIST-gilUlju-gunUlsan 44919South Korea

Given the crucial role of film morphology in determining the photovoltaic parameters of organic solar cells(OSCs),solvent or solid additives have been widely used to realize fine-tuned film morphological features to further improve the performance of ***,most high-performance OSCs are processed only using single component additive,either solvent additive or solid ***,a simple molecular building block,namely thieno[3,4-b]thiophene(TT),was utilized as the solid additive to coordinate with the widely used solvent additive,1-chloronaphthalene(CN),to modulate the film *** investigations revealed that the addition of TT could prevent the excessive aggregation to form a delicate nanoscale phase separation,leading to enhanced charge transport and suppressed charge recombination,as well as superior photovoltaic ***,the PM6:Y6 based OSCs with the addition of hybrid additive of CN+TT demonstrated the optimal PCE of 18.52%,with a notable FF of 79.6%.More impressively,the PM6:Y6:PC71BM based ternary OSCs treated with the hybrid additives delivered a remarkable efficiency of 19.05%,which ranks among the best values of Y6-based OSCs reported so *** work highlights the importance of the hybrid additive strategy in regulating the active layer morphology towards significantly improved performance.

关键词： Organic solar cells Morphology regulation solid additive Synergistic effects Photovoltaic properties

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Neutron diffraction study on anomalous thermal expansion of CrB_(2)

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Chinese Journal of Structural Chemistry 2023年第5期42卷 8-12页

作者： Yong Xu Xin Chen Yili Cao Kun Lin Chin-Wei Wang Qiang Li Jinxia Deng Jun Miao Xianran Xing Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Solid State ChemistryUniversity of Science and Technology BeijingBeijing100083China Neutron Group National Synchrotron Radiation Research CenterHsinchu30076TaiwanChina

Thermal expansion is an essential issue in the field of materials science and *** of anomalous thermal expansion is beneficial to controlling it and developing related ***,we report disitinctly anisotropic thermal expansion of CrB_(2)via temperature dependence of neutron diffraction,in which positive thermal expansion is observed within basal plane whereas negative thermal expansion emerges along the c ***,zero thermal expansion of unit cell volume is determined from 5 to 130 K with the coefficient of thermal expansion ofāv=0.4(1)×10^(-6)K^(-1).Magnetization measurement shows there is an antiferromagnetic-paramagnetic transition near 90 K,which may correlate to the thermal expansion *** calculations identify no chemical binding of Cr-Cr pair,implying such antiferromagnetic ordering originates from the double exchange interaction of Cr-B-Cr.

关键词： Negative thermal expansion Neutron diffraction Diboride

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Intrinsically stretchable light-emitting drawing displays

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npj Flexible Electronics 2024年第1期8卷 949-956页

作者： Jiaxue Zhang Qianying Lu Ming Wu Yuping Sun Shaolei Wang Xiaoliang Wang Ming-Hui Lu Desheng Kong College of Engineering and Applied Sciences National Laboratory of Solid State Microstructureand Collaborative Innovation Center of Advanced MicrostructuresNanjing 210093China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing UniversityNanjing 210023China State Key Laboratory of Analytical Chemistry for Life Science Nanjing UniversityNanjing 210023China Key Laboratory of High Performance Polymer Materials and Technology of Ministry of Education Department of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Stretchable displays that combine light-emitting capabilities with mechanical compliance are essential building blocks of nextgeneration wearable ***,their widespread applications are currently limited by complex device architecture,limited pixel density,and immature fabrication *** this study,we present the device design and material developments of intrinsically stretchable light-emitting drawing displays that can show arbitrary hand-drawing *** alternating-current electroluminescent display uses a simplified architecture comprising coplanar interdigitated liquid metal electrodes,an electroluminescent layer,and a dielectric encapsulation *** patterns on the device are coupled with the interdigitated electrodes under alternating voltage stimulations,generating localized electric fields for bright *** inks are prepared for painting,stamping,and stencil *** luminous features on the devices can be either long-lasting or transient in *** skin-like devices are made entirely of compliant materials that can withstand bending,twisting,and stretching *** to the excellent mechanical deformability,the drawing displays can be conformally laminated on the skin as body-integrated optoelectronic communication devices for graphic information.

关键词： light luminous stretching

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Direct observation of the distribution of impurity in phosphorous/boron co-doped Si nanocrystals

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Chinese Physics B 2023年第12期32卷 454-458页

作者：李东珂韩俊楠孙腾陈佳明 Etienne Talbot Rémi Demoulin 陈王华皮孝东徐骏陈坤基 School of Electronic Science and Engineering National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresJiangsu Provincial Key Laboratory of Advanced Photonic and Electronic MaterialsNanjing UniversityNanjing 210000China ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Materials Science and EngineeringZhejiang UniversityHangzhou 311200China Univ Rouen Normandie INSA Rouen NormandieCNRSGPM UMR 6634F-76000 RouenFrance School of Physical Science and Technology Ningbo UniversityNingbo 315211China

Doping in Si nanocrystals is an interesting topic and directly studying the distribution of dopants in phosphorous/boron co-doping is an important issue facing the scientific *** this study,atom probe tomography is performed to study the structures and distribution of impurity in phosphorous/boron co-doped Si nanocrystals/SiO_(2) *** with phosphorous singly doped Si nanocrystals,it is interesting to find that the concentration of phosphorous in co-doped samples can be significantly *** simulation suggests that phosphorous-boron pairs are formed in co-doped Si nanocrystals with the lowest formation energy,which also reduces the formation energy of phosphorous in Si *** results indicate that co-doping can promote the entry of phosphorous impurities into the near-surface and inner sites of Si nanocrystals,which provides an interesting way to regulate the electronic and optical properties of Si nanocrystals such as the observed enhancement of conductivity and sub-band light emission.

关键词： Si nanocrystals phosphorous and boron co-doping impurity distribution

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