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Tuning the structures of two-dimensional cuprous oxid econfined on Au（111）

Nano Research 2018年第11期11卷 5957-5967页

作者： Qingfei Liu Nannan Han Shengbai Zhang Jijun Zhao Fan Yang Xinhe Bao State Key Laboratory of Catalysis Collaborative Innovation Center of Chemistry for Energy Materials Dafian Institute of Chemical Physics Chinese Academy of Sciences Zhongshan Road 457 Dalian 116023 China Key Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Ministry of EducationDalian 116024 China Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy NY 12180 USA University of Chinese Academy of Sdences Beijing 100049 China

Two-dimensional (2D) cuprous oxide (Cu2O) nanostructures (NSs) of monolayer thickness were synthesized on Au(111) and characterized using atomic-resolution scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory (DFT) calculations. The surface and edge structures of 2D Cu2O were resolved at the atomic level and found to exhibit a graphene-like lattice structure. Cu2O NSs grew preferentially at the face centered cubic (fcc) domains of Au(111). Depending on the annealing temperature, the shapes and structures of Cu2O NSs were found to vary from elongated islands with a defective hexagonal lattice (mostly topological 5-7 defects) to triangular NSs with an almost-perfect hexagonal lattice. The edge structures of Cu2O NSs also varied with the annealing temperature, from predominantly the arm-chair 56 structure at 400 K to almost exclusively the zig-zag structure at 600 K. DFT calculations suggested that the herringbone ridges of Au(111) confined the growth and structure of Cu2O NSs on Au(111). As such, the arm-chair edges of Cu2O NSs, which are less stable than the zig-zag edges, could be exposed preferentially at 400 K. Cu2O NSs developed into the thermodynamically-favored triangular form and exposed zig-zag edges at 600 K, when the Au(111) substrate became mobile. The confined growth of 2D cuprous oxide on Au(111) demonstrated the importance of metal-oxide interactions in tuning the structures of supported 2D oxide NSs.

关键词： cuprous oxide Au(111) scanning tunneling microscopy confine

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The study of the interactions between graphene and Ge（001）/Si（001）

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Nano Research 2017年第11期10卷 3648-3661页

作者： Pawel Dabrowski Maciej Rogala Iwona Pasternak Jacek Baranowski Wlodzimierz Strupinski Marek Kopciuszynski Ryszard Zdyb Mieczyslaw Jalochowski Iaroslav Lutsyk Zbigniew Klusek Department of Solid State Physics Faculty of Physics and Applied Informatics University of Lodz Pomorska 149/153 90-236 Lodz Poland Institute of Electronic Materials Technology Wolczynska 133 01-919 Warsaw Poland Institute of Physics Maria Curie-Sklodowska University pl.M.Curie-Sklodowskiej 1 20-031 Lublin Poland Department of Solid State Physics Yuriy Fedkovych Chernivtsi National University Kotsubinsky 2 58012 Chernivtsi Ukraine

The interaction between graphene and germanium surfaces was investigated using a combination of microscopic and macroscopic experimental techniques and complementary theoretical *** functional theory （DFT） calculations for different reconstructions of the Ge（001） surface showed that the interactions between graphene and the Ge（001） surface introduce additional peaks in the density of states,superimposed on the graphene valence and conduction energy *** growth of graphene induces nanofaceting of the Ge（001） surface,which exhibits well-organized hill and valley *** graphene regions covered by hills are of high quality and exhibit an almost linear dispersion relation,which indicates weak graphene-germanium *** the other hand,the graphene component occupying valley regions is significantly perturbed by the interaction with *** was also found that the stronger graphene-germanium interaction observed in the valley regions is connected with a lower local electrical *** of graphene/Ge（001）/Si（001） was performed to obtain a more uniform *** process results in a surface characterized by negligible hill and valley structures;however,the graphene properties unexpectedly deteriorated with increasing uniformity of the Ge（001） *** sum up,it was shown that the mechanism responsible for the formation of local conductivity inhomogeneities in graphene covering the Ge（001） surface is related to the different strength of graphene-germanium *** present results indicate that,in order to obtain high-quality graphene,the experimental efforts should focus on limiting the interactions between germanium and graphene,which can be achieved by adjusting the growth conditions.

关键词： chemical vapor deposition surface reconstruction scanning tunneling microscopy chemical bonding first-principles calculation

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Phase transition-induced superstructures ofβ-Sn films with atomic-scale thickness

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Chinese Physics B 2021年第9期30卷 434-439页

作者： Le Lei Feiyue Cao Shuya Xing Haoyu Dong Jianfeng Guo Shangzhi Gu Yanyan Geng Shuo Mi Hanxiang Wu Fei Pang Rui Xu Wei Ji Zhihai Cheng Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China

The ultrathinβ-Sn(001)films have attracted tremendous attention owing to its topological superconductivity(TSC),which hosts Majorana bound state(MBSs)for quantum ***,β-Sn(001)thin films have been successfully fabricated via phase transition ***,the understanding of structural phase transition ofβ-Sn(001)thin films is still ***,we report the direct growth of ultrathinβ-Sn(001)films epitaxially on the highly oriented pyrolytic graphite(HOPG)substrate and the characterization of intricate structural-transition-induced *** morphology was obtained by using atomic force microscopy(AFM)and low-temperature scanning tunneling microscopy(STM),indicating a structure-related bilayer-by-bilayer growth *** ultrathinβ-Sn film was made of multiple domains with various *** high-symmetric and distorted superstructures were observed in the atomic-resolution STM images of these *** formation mechanism of these superstructures was further discussed based on the structural phase transition ofβtoα-Sn at the atomic-scale *** work not only brings a deep understanding of the structural phase transition of Sn film at the two-dimensional limit,but also paves a way to investigate their structure-sensitive topological properties.

关键词： epitaxial growth β-Sn films bilayer-by-bilayer superstructures structural transition scanning tunneling microscopy surface energy

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Influence of metal support in-plane symmetry on the corrugation of hexagonal boron nitride and graphene monolayers

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Nano Research 2018年第9期11卷 4643-4653页

作者： Antonio d. Martinez-Galera Jose M. Gomez-Rodriguez Departamento de Fisica de la Matefia Condensada Universidad Autonoma de Madrid Madrid E-28049 Spain Condensed Matter Physics Center (IFIMAC) UniversidadAutdnoma de Madrid Madrid E-28049 Spain Instituto Nicolds Cabrera Universidad Autonoma de Madrid Madrid E-28049 Spain

Predicting the properties of two-dimensional （2D） materials as graphene and hexagonal boron nitride （h-BN） monolayers after their growth on any given substrate is a major challenge. While the influence of the electron configuration of the atoms of the underlying surface is well-understood, the effect of substrate geometry still remains unclear. The structural properties of h-BN monolayers grown on a rectangularly packed Rh（110） surface were characterized in situ by ultrahigh vacuum scanning tunneling microscopy and were compared to those that this material exhibits when grown on substrates showing different crystallographic orientations. Although the h-BN monolayer grown on Rh（110） was dominated by a unique quasiunidimensional moir6 pattern, suggesting considerable interface interaction, the moir6 corrugation was unexpectedly smaller than those reported for strongly interacting interfaces with hexagonal-terminated substrates, owing to differences in the possible binding landscapes at interfaces with differently oriented substrates. Moreover, a rule was derived for predicting how interface corrugation and the existence and extent of subregions within moir6 supercells containing favorable sites for orbital mixing between h-BN monolayers and their supports depend on substrate symmetry. These general symmetry considerations can be applied to numerous 2D materials, including graphene, thereby enabling the prediction of how substrate choice determines the properties of these materials. Furthermore, they could also provide new routes for tuning 2D material properties and for developing nanotemplates showing different geometries for Krowing adsorbate superlattices.

关键词： hexagonal boron nitride graphene two-dimensional materials scanning tunneling microscopy moire superstructures nanotemplates

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Lateral epitaxial growth of two-dimensional heterostructure linked by gold adatoms

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Nano Research 2021年第3期14卷 887-892页

作者： Nan Si Tao Shen Xinyi Liu Dechun Zhou Qingmin Ji Wei Liu Shuang Li Tianchao Niu Herbert Gleiter Institute of Nanoscience School of Material Science and EngineeringNanjing University of Science and TechnologyNanjing210094China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

Lateral two-dimensional(2D)heterostructures have great potential for device engineering at the atomistic *** production is hindered by difficulties in obtaining atomically sharp interface free from *** we report the continuous construction of a lateral heterostructure using blue phosphorene and tetrafluoro-tetracyanoquinodimethane(F_(4)TCNQ)as the building *** lateral heterostructure is achieved by linking the semiconducting F_(4)TCNQ-Au metal organic framework and the metallic blue phosphorene-Au network via Au *** structural and electronic properties of the heterostructure have been investigated by means of scanning tunneling microscopy and spectroscopy(STM/S),complemented by density functional theory(DFT)calculations,demonstrating a structurally and electrically abrupt *** approach offers the possibility of high flexibility and control that can be extended to other metal-organic species and 2D materials,establishing a foundation for the development of atomically thin in-plane superlattice and devices.

关键词： phosphorene self-assembly scanning tunneling microscopy two-dimensional materials density functional theory

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Tailoring the Self-assembly of Melamine on Au（111） via Doping with Cu Atoms

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Chinese Journal of Chemical Physics 2017年第4期30卷 443-449,I0002页

作者：石何霞王文元李喆王利邵翔中国科学技术大学化学物理系中国科学院城市污染物转化重点实验室中国科学技术大学量子信息与量子科技前沿协同创新中心合肥230026

The doping effect of Cu on the self-assembly film of melamine on an Au（111） surface has been investigated with scanning tunneling microscopy （STM）. The evaporated Cu adatoms occupy the positions underneath the amino groups and change the hydrogen bonding pat- tern between the melamine molecules. Accordingly, the self-assembly structure has changed stepwise from a well-defined honeycomb into a track-like and then a triangular structure depending on the amount of Cu adatoms. The interaction between Cu adatom and melamine is moderate thus the Cu adatoms can be released upon mild heating to around 100 ℃. These findings are different from previous observations of either the coordination assembly or the physically trapped metal adatoms.

关键词： Melamine Self-assembly scanning tunneling microscopy Cu adatoms Hydrogen bonding

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Adsorption behavior of iron phthalocyanine on a Ag(110) surface

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Chinese Physics B 2012年第3期21卷 379-382页

作者：吴珂黄齐晅张寒洁廖清何丕模 Physics Department Zhejiang University

An investigation on the growth behavior of FePc on a Ag （110） surface is carried out by using scanning tunneling microscopy （STM）. At an FePc coverage of 3.5 ML, an ordered superstructure （densely packed） with a lateral shift is observed. The densely packed superstructure can be attributed to the substrate commensuration and the intermolecular van der Waals attractive interaction. The in-plane lateral shift in the superphase is specifically along the direction of [110] azimuth. The results provide a new perspective to understanding the intermolecular and the molecule-substrate interactions.

关键词： organic semiconductor scanning tunneling microscopy lateral shift intermolecular in-teraction

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Construction of bilayer PdSe2 on epitaxial graphene

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Nano Research 2018年第11期11卷 5858-5865页

作者： En Li Dongfei Wang Peng Fan Ruizi Zhang Yu-Yang Zhang Geng Li Jinhai Mao Yeliang Wang Xiao Lin Shixuan Du Hong-Jun Gao Institute of Physics & University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 1 O0190 Chino

Two-dimensional (2D) materials have received significant attention due to their unique physical properties and potential applications in electronics and optoelectronics. Recent studies have demonstrated that exfoliated PdSe2, a layered transition metal dichalcogenide (TMD), exhibits ambipolar field-effect transistor (FET) behavior with notable performance and good air stability, and thus serves as an emerging candidate for 2D electronics. Here, we report the growth of bilayer PdSe2 on a graphene-SiC(0001) substrate by molecular beam epitaxy (MBE). A bandgap of 1.15 +/- 0.07 eV was revealed by scanning tunneling spectroscopy (STS). Moreover, a bandgap shift of 0.2 eV was observed in PdSe2 layers grown on monolayer graphene as compared to those grown on bilayer graphene. The realization of nanoscale electronic junctions with atomically sharp boundaries in 2D PdSe2 implies the possibility of tuning its electronic or optoelectronic properties. In addition, on top of the PdSe2 bilayers, PdSe2 nanoribbons and stacks of nanoribbons with a fixed orientation have been fabricated. The bottom-up fabrication of low-dimensional PdSe2 structures is expected to enable substantial exploration of its potential applications.

关键词： two-dimensional materials transition-metal dichalcogenides PdSe2 scanning tunneling microscopy spectroscopy semiconducting bandgap nanoribbon

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Interplay between the atomic structures and superconductivity of two-monolayer Pb films

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 90-98页

作者： Kun Xie Ze Huang Pengju Li Yumin Xia Desheng Cai Yitong Gu Yuzhou Liu Fangliang Cai Runxiao Zhang Haohao Shi Ping Cui Shengyong Qin International Center for Quantum Design of Functional Materials(ICQD) University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Superconductors with reduced dimensionality have been widely explored for their exotic superconducting ***,at the two-dimensional limit,two-monolayer Pb films with two types of structures provide an ideal platform to unveil the underlying superconducting mechanism[Science 324,1314(2009)].Here,by combining scanning tunneling microscopy(STM)with the first-principle calculations,we successfully identify that these two types have different atomic lattice structures with varying stacking phases,which further enables us to calculate the phonon spectrum and electron phonon coupling strength of each *** theoretical calculations are in good agreement with tunneling spectroscopy measurements of the superconducting transition temperatures(T_(c)),which established a correlation between atomic structures and ***,it was observed that the higher T_(c)of these two types also possess higher out-of-plane upper critical magnetic fields(Hc2).These findings will provide important new insights into two-dimensional superconductivity at the atomic level.

关键词： 2 ML Pb films superconductivity atomic structure scanning tunneling microscopy first-principle calculations

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Oxygen-promoted synthesis of armchair graphene nanoribbons on Cu(111)

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Science China Chemistry 2021年第4期64卷 636-641页

作者： Penghui Ji Oliver MacLean Gianluca Galeotti Dominik Dettmann Giulia Berti Kewei Sun Haiming Zhang Federico Rosei Lifeng Chi Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft MaterialsSoochow UniversitySuzhou 215123China Centre Energie Matériaux et TélécommunicationsInstitut National de la Recherche Scientifique1650 Boulevard Lionel-BouletVarennesQCCanada Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Deutsches Museum Museumsinsel 180538 MunichGermany Research Center for Advanced Measurement and Characterization National Institute for Materials ScienceTsukubaIbaraki 305-0047Japan

We report the systematic investigation of the effects of oxygen on the synthesis of 3 p sub-family armchair graphene nanoribbons(3 p-AGNRs),which revealed a strong catalytic effect with a reduction in the reaction temperature by approximately 180 K without degradation of the ***(para-phenylene)(3-AGNR)was generated through Ullmann-type coupling of4,4’’-dibromo-p-terphenyl on Cu(111),which was then converted into wider 3 p-AGNRs via lateral *** tunneling microscopy(STM)and X-ray photoelectron spectroscopy demonstrated the formation of different ribbons up to 12-AGNR,which contained regions exhibiting increased STM contrast that we attribute to the intercalation of Br atoms during lateral fusion.

关键词： on-surface synthesis graphene nanoribbons C–H activation scanning tunneling microscopy X-ray photoelectron spectroscopy

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