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Direct Evidence for Lip Lip Interactions in Multi-Walled Carbon Nanotubes

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Nano Research 2008年第5期1卷 434-439页

作者： chuanhong jin Kazu Suenaga Sumio Iijima Nanotube Research Center National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8565Japan

The stability of open edged multi-walled carbon nanotubes has been investigated by using in situ high resolution transmission electron microscopy at elevated *** of inter-shell structures was experimentally observed for the first time and attributed to a robust interaction between adjacent concentric shells(so-called lip lip interaction).The fl uctuating behavior of the inter-shell structures suggests a mechanism by which the carbon atoms can pass in or out through the inter-shell edges during carbon nanotube growth or shrinkage processes.

关键词： Multi-walled carbon nanotubes lip lip interaction in situ transmission electron microscopy

In-situ fabrication of Mo6S6-nanowire-terminated edges in monolayer molybdenum disulfide

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Nano Research 2018年第11期11卷 5849-5857页

作者： Wei Huang Xiaowei Wang Xujing Ji Ze Zhang chuanhong jin State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Edge structures are highly relevant to the electronic, magnetic, and catalytic properties of two-dimensional (2D) transition metal dichalcogenides (TMDs) and their one-dimensional (1D) counterparts, i.e., nanoribbons, and should be precisely tailored for the desired application. In this work, we report the formation of novel Mo6S6 nanowire (NW)-terminated edges in monolayer molybdenum disulfide (MoS2) via an e–beam irradiation process combined with high temperature heating. The atomic structures of the NW-terminated edges and the dynamic formation process were observed experimentally using scanning transmission electron microscopy. Further analysis showed that the NW-terminated edge could be formed on both the Mo-zigzag (ZZ) edge and S-ZZ edge and could exhibit a stability superior to that of the pristine ZZ and armchair (AC) edges. In addition, analogous edge structures could also be formed in MoS2 nanoribbons and other TMD materials such as MoxW1−xSe2. We believe that these novel edge structures may impart novel properties to the 2D and 1D TMD materials and provide new opportunities for their applications in catalytic, spintronic, and electronic devices.

关键词： molybdenum disulfide (MoS_2) transition metal dichalcogenides nanowire edge structure in-situ

Black phosphorus nanoflakes as morphology modifier for efficient fullerene-free organic solar cells with high fill-factor and better morphological stability

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Nano Research 2019年第4期12卷 777-783页

作者： Weitao Yang Long Ye Fenfa Yao chuanhong jin Harald Ade Hongzheng Chen State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization& Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Physics Organic and Carbon Electronics Laboratory (ORaCEL) North Carolina State University Raleigh NC 27695 USA State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Morphology of the donor:acceptor blend plays a critical role in the photovoltaic performance of the organic solar cells (OSCs).Herein,liquid-phase-exfoliated black phosphorus nanoflakes (BPNFs),for their outstanding electronic property and good compatibility to solution process,were applied to fullerene-free OSCs as morphology *** by X-ray scattering measurements,the PTB7-Th:IEICO-4F blends incorporated with BPNFs exhibit more ordered π-π stacking and promoted domain purity,contributing to lower charge transport resistance and suppressed charge recombination within the bulk heterojunction (BHJ).As a result,a high fill factor (FF) of 0.73 and a best power conversion efficiency (PCE) of 12.2% were obtained for fullerene-free OSCs based on PTB7-Th:IEICO-4F blends incorporating with BPNFs,which is among the highest FF of the as-cast fullerene-free OSCs with PCE over 12%.More importantly,the embedded BPNFs help to improve the morphological stability of the devices probably by retarding the phase mixing in the BHJ during the aging ***,analogous enhancements were observed in another fullerene-free OSCs based on PBDB-T:*** a word,this work provides a new strategy of using two-dimentional nanoflakes as facile and universal morphology modifier for efficient fullerene-free OSCs.

关键词： fullerene-free organic solar cells black phosphorus nanoflakes morphology tuning device stability

Oxidation behavior of cobalt nanoparticles studied by in situ environmental transmission electron microscopy

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Science Bulletin 2017年第11期62卷 775-778页

作者： Dejiong Zhang chuanhong jin Z.Y.Li Ze Zhang Jixue Li State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang University Nanoscale Physics Research Laboratory School of Physics and AstronomyUniversity of Birmingham

The dynamics of oxidation of cobalt nanoparticles were directly revealed by in situ environmental transmission electron ***,cobalt nanoparticles were oxidized to polycrystalline cobalt monoxide,then to polycrystalline tricobalt tetroxide,in the presence of oxygen with a low partial *** cavities(or voids) were formed during the oxidation,owing to the Kirkendall *** of the oxides growth suggested that the oxidation of cobalt nanoparticles followed a parabolic rate law,which was consistent with diffusion-limited *** situ transmission electron microscopy allowed potential atomic oxidation pathways to be *** outward diffusion of cobalt atoms inside the oxide layer controlled the oxidation,and formed the hollow *** by the electron beam,which destroyed the sealing effect of graphite layer coated on the cobalt surface and resulted in fast oxidation rate,played an important role in activating and promoting the *** findings further our understanding on the microscopic kinetics of metal nanocrystal oxidation and knowledge of energetic electrons promoting oxidation reaction.

关键词： Cobalt Nanoparticle Oxidation dynamics Parabolic rate Environmental transmission electron microscopy (ETEM) Electron irradiation

Niobium doping induced mirror twin boundaries in MBE grown WSe2 monolayers

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Nano Research 2020年第7期13卷 1889-1896页

作者： Bo Wang Yipu Xia Junqiu Zhang Hannu-Pekka Komsa Maohai Xie Yong Peng chuanhong jin Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310024China Physics Department The University of Hong KongPokfulam RoadHong Kong 999077China Department of Applied Physics Aalto University00076 AaltoFinland Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan 411201China

Mirror twin boundary(MTB)brings unique one-dimensional(1D)physics and properties into two-dimensional(2D)transition metal dichalcogenides(TMDCs),but they were rarely observed in non-Mo-based ***,by post growth Nb doping,high density 4|4E-W and 4|4P-Se mirror twin boundaries(MTBs)were introduced into molecular beam epitaxy(MBE)grown WSe2 *** them,4|4E-W MTB with a novel structure was discovered experimentally for the first time,while 4|4P-Se MTBs present a random permutations of W and Nb,forming a 1D alloy *** between the doped and non-doped WSe2 confirmed that Nb dopants are essential for MTB ***,quantitative statistics reveal the areal density of MTBs is directly proportional to the concentration of Nb *** unravel the injection pathway of Nb dopants,first-principles calculations about a set of formation energies for excess Nb atoms with different configurations were conducted,based on which a model explaining the origin of MTBs introduced by excess metal was *** conclude that the formation of MTBs is mainly driven by the collective evolution of excess Nb atoms introduced into the lttice of host WSe2 crystal and subsequent displacement of metal atoms(W or Nb).This study provides a novel way to tailor the MTBs in 2D TMDC materials via proper metal doping and presents new opportunities for exploring the intriguing properties.

关键词： mirror twin boundaries niobium doping molecular beam epitaxy transition metal dichalcogenides niobium tungsten diselenide

Direct identification of monolayer rhenium diselenide by an individual diffraction pattern

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Nano Research 2017年第7期10卷 2535-2544页

作者： Zhen Fei Bo Wang Ching-Hwa Ho Fang Lin Jun Yuan Ze Zhang chuanhong jin State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China School of Physical Science and Technology Lanzhou University Lanzhou 730000 China Graduate Institute of Applied Science and Technology Taiwan University of Science and Technology Taipei 106 Taiwan China College of Electronic Engineering South China Agricultural University Guangzhou 510642 China Department of Physics University of York Heslington York YO 10 5DD UK

In the current extensive studies of layered two-dimensional （2D） materials, compared to hexagonal structures such as graphene, hBN, and MoS2, low- symmetry 2D materials have shown great potential for applications in anisotropic devices. Rhenium diselenide （ReSe2） possesses the bulk space group P1 and belongs to the triclinic crystal system with a deformed cadmium-iodide-type structure. Here, we propose an electron diffraction-based method to distinguish the monolayer ReSe2 membrane from multilayer ReSe2 and its two different vertical orientations. Our method is also applicable to other low-symmetry crystal systems, including both triclinic and monoclinic lattices, as long as their third unit-cell basis vectors are not perpendicular to the basal plane. Our experimental results are well explained by kinematical electron diffraction theory and the corresponding simulations. Generalization of our method to other 2D materials, such as ~：raphene, is also discussed.

关键词： rhenium diselenide electron diffraction monolayer reciprocal rel-rod

Shaped Pt-Ni nanocrystals with an ultrathin Pt-enriched shell derived from one-pot hydrothermal synthesis as active electrocatalysts for oxygen reduction

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Nano Research 2015年第5期8卷 1480-1496页

作者： Jun Gu Guangxu Lan Yingying Jiang Yanshuang Xu Wei Zhu chuanhong jin Yawen Zhang Beijing National Laboratory for Molecular Science State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University Beijing 100871 China State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Alloy nanocrystals （NCs） of Pt with 3d transition metals, especially Ni, are excellent catalysts for the oxygen reduction reaction （ORR）. In this work, we, for the first time, demonstrated the water phase colloidal synthesis of Pt-M （M = Ni, Co and Fe） alloy NCs with tunable composition and morphology through a facile hydrothermal method. Pt-Ni alloy NCs synthesized with this method presented better ORR activity than commercial Pt/C catalysts. The X-ray energy dispersive spectra （EDS） mapping technique revealed that Pt-enriched shells existed on the as-synthesized Pt-Ni alloy NCs. About two atom thick layered Pt-enriched shells formed on Pts0Nis0 NCs and the thickness of the Pt-enriched shells increased as the Ni content increased. Furthermore, X-ray photoelectron spectroscopy analysis revealed that the oxidation level of the surface Pt atoms on the Pt-Ni alloy NCs decreased compared with monometallic Pt NCs, implying a decrease in the oxophilicity of the surface Pt atoms. Pt-Ni alloy NCs with lower oxophilicity of the surface Pt atoms give higher ORR activity. The most active alloy sample showed 13 times higher specific activity and six times higher mass activity at 0.9 V vs. a reversible hydrogen electrode when compared with commercial Pt/C. Pt-Ni alloy NCs also showed better durability than commercial Pt/C in long term ORR tests.

关键词： Pt-NiPt-Ni alloy nanocrystals bimetallic catalysts oxygen reduction reaction dealloying aqueous-phase synthesis

Self-supporting nanoporous gold-palladium overlayer bifunctional catalysts toward oxygen reduction and evolution reactions

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Nano Research 2016年第12期9卷 3781-3794页

作者： Yan Wang Wei Huang Conghui Si Jie Zhang Xuejiao Yan chuanhong jin Yi Ding Zhonghua Zhang School of Materials Science and Engineering University of Jinan 336 West Road of Nan Xinzhuang Jinan 250022 China State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering Zhejiang University Hangzhou Hangzhou 310027 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) School of Materials Science and Engineering Shandong University Jingshi Road 17923 Jinan 25006 1 China School of Materials Science and Engineering Tianjin University of Technology 391 BinshuiXidao Xiqing District Tianjin 300384 China

The oxygen reduction reaction （ORR） and oxygen evolution reaction （OER） are crucial processes for energy conversion/storage systems, such as fuel cells, metal-air batteries, and water splitting. However, both reactions are severely restricted by their sluggish kinetics, thus requiring highly active, cost-effective, and durable electrocatalysts. Herein, we develop novel bifunctional nanocatalysts through surface nanoengineering of dealloying-driven nanoporous gold （NPG）. Pd overlayers were precisely deposited onto the NPG ligament surface by epitaxial layer-by-layer growth. More importantly, the obtained NPG-Pd overlayer nanocatalysts exhibit remarkably enhanced electrocatalytic activities toward both the ORR and OER in alkaline media, benchmarked against a state- of-the-art Pt/C catalyst. The improved electrocatalytic performance is rationalized by the unique three-dimensional nanoarchitecture of NPG, enhanced Pd utilization efficiency from precise control of the Pd overlayers, and change in electronic structure, as revealed by density functional theory calculations.

关键词： oxygen reduction reaction oxygen evolution reaction nanoporous gold Pd overlayer density functional theory

Spherical to truncated octahedral shape transformation of palladium nanocrystals driven by e-beam in aqueous solution

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Nano Research 2019年第10期12卷 2623-2627页

作者： Yingying Jiang Xiao Li Xiaoming Ma Haifeng Wang Hui Zhang Zheng Liu Ze Zhang chuanhong jin State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Chemistry Zhejiang UniversityHangzhou 310027China Inorganic Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Nagoya 463-8560Japan

The crystallographic shapes of nano crystals play critical roles in determi ning their physical and chemical *** phase synthesis serves as one of the most importa nt approaches for preparing shape-controlled nano crystals,therefore,understa nding the formation mecha nisms of the thermod yn amic equilibrium structures of nano crystals in liquid soluti on is importa *** in situ liquid cell tran smissi on electron microscopy(TEM),we observe for the first time the shape transformation of individual palladium nanocrystals from energy unfavored spherical shapes into equilibrium truncated octahedrons in aqueous *** quantitative analysis of the shape evolution dynamics of an individual Pd nano crystal,we find that about 10%of nano crystal atoms were relocated during the shape tran *** mass tran sport is attributed to the synergetic effect of electron beam irradiation and water environment.

关键词： equilibrium shape Pd nanocrystals shape transformation dynamics liquid cell transmission electron microscopy(TEM)