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基于电化学液膜法腐蚀制备stm钨探针的研究

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贵州科学 2024年第1期42卷 90-93页

作者：马玉麟丁召王一郭祥贵州大学大数据与信息工程学院贵州贵阳550025 贵州省微纳电子与软件技术重点实验室贵州贵阳550025 半导体功率器件可靠性教育部工程研究中心贵州贵阳550025

高质量的探针是保证扫描隧道显微镜(Scanning Tunneling Microscope,stm)4K分辨率的关键。为得到原子级别的探针,实验基于电化学腐蚀原理,使用垂直液膜法制备钨探针。在制备过程中通过控制变量法,研究了腐蚀电压、液膜下钨丝长度等参数... 详细信息

高质量的探针是保证扫描隧道显微镜(Scanning Tunneling Microscope,stm)4K分辨率的关键。为得到原子级别的探针,实验基于电化学腐蚀原理,使用垂直液膜法制备钨探针。在制备过程中通过控制变量法,研究了腐蚀电压、液膜下钨丝长度等参数对探针质量的影响,实验发现,当使用2 mol/L的NaOH溶液作为液膜时,最佳腐蚀电压为5 V、最佳液膜下钨丝长度为4 mm。该研究为电化学液膜法腐蚀制备钨探针提供了参考依据。

关键词：液膜法钨探针电化学腐蚀 stm

第七届国际扫描隧道显微学学术会议（stm’93）在北京召开

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物理 1994年第1期 59-60页

作者： stm’93会议组委会秘书处中国科学院化学研究所ＳＴＭ’９３会议组委会秘书处

第七届国际扫描隧道显微学学术会议（ＳＴＭ’９３）在北京召开经过近两年的紧张筹备，由中国科学院化学研究所主办的第七届国际扫描隧道显微学学术会议（ＳＴＭ’９３）于１９９３年８月９日至１３日在北京召开。国家科委、中国科学院... 详细信息

第七届国际扫描隧道显微学学术会议（ＳＴＭ’９３）在北京召开经过近两年的紧张筹备，由中国科学院化学研究所主办的第七届国际扫描隧道显微学学术会议（ＳＴＭ’９３）于１９９３年８月９日至１３日在北京召开。国家科委、中国科学院、国家自然科学基金委员会、国家人事...

关键词：北京中国科学院化学研究所学术会议扫描隧道显微学国家自然科学基金委员会江泽民主席国家科委国家科学技术委员会 stm

Manipulating Hubbard-type Coulomb blockade effect of metallic wires embedded in an insulator

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National Science Review 2023年第3期10卷 127-133页

作者： Xing Yang Zhao-Long Gu Huimin Wang Jing-Jing Xian Sheng Meng Naoto Nagaosa Wen-Hao Zhang Hai-Wen Liu Zi-Heng Ling Kai Fan Zhi-Mo Zhang Le Qin Zhi-Hao Zhang Yan Liang Jian-Xin Li Ying-Shuang Fu School of Physics and Wuhan National High Magnetic Field Center Huazhong University of Science and Technology National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences RIKEN Center for Emergent Matter Science(CEMS) Department of Applied Physics University of Tokyo Center for Advanced Quantum Studies Department of Physics Beijing Normal University Collaborative Innovation Center of Advanced Microstructures Nanjing University Hubei Key Laboratory of Gravitation and Quantum Physics Huazhong University of Science and Technology Wuhan Institute of Quantum Technology

Correlated states have emerged in low-dimensional systems owing to enhanced Coulomb interactions.Elucidating these states requires atomic-scale characterization and delicate control capabilities.Herein,spectroscopic imaging-scanning tunneling microscopy was employed to investigate the correlated states residing in 1D electrons of the monolayer and bilayer MoSe2 mirror twin boundary(MTB).The Coulomb energies,determined by the wire length,drive the MTB into two types of ground states with distinct respective out-of-phase and in-phase charge orders.The two ground states can be reversibly converted through a metastable zero-energy state with in situ voltage pulses,which tune the electron filling of the MTB via a polaronic process,substantiated by first-principles calculations.Our Hubbard model calculation with an exact diagonalization method reveals the ground states as correlated insulators from an on-site U-originated Coulomb interaction,dubbed the Hubbard-type Coulomb blockade effect.Our study lays a foundation for understanding and tailoring correlated physics in complex systems.

关键词： stm one-dimensional Coulomb effect electron correlation Hubbard

ERF5 enhances protocorm-like body regeneration via enhancement of stm expression in Dendrobium orchid

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植物学报:英文版 2023年第9期65卷 2071-2085页

作者： Danqi Zeng Can Si Mingze Zhang Jun Duan Chunmei He Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement&Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China University of the Chinese Academy of Sciences Beijing 100049China South China National Botanical Garden Guangzhou 510650China Center of Economic Botany Core Botanical GardensChinese Academy of SciencesGuangzhou 510650China

Orchid plants develop protocorms upon germination and produce protocorm-like structures called protocorm-like bodies(PLBs)from protocorms and somatic cells via tissue culture.Protocorm-like bodies have broad technical application potential in the orchid industry and their regeneration is a distinct developmental process in the plant kingdom.However,little is known about this unparalleled developmental program.In this study,we identified a PLB-abundant gene,ethylene response factor(ERF),and a transcription factor named Do ERF5,and determined its important role in PLB regeneration in Dendrobium orchid.Overexpression of Do ERF5 in Dendrobium greatly enhanced the PLB regeneration from PLB and stem explants,and upregulated the expression of WOUND-INDUCED DEDIFFERENTIATION(Do WIND)homologs and SHOOT MERISTEMLESS(Do stm),as well as the genes involved in cytokinin biosynthesis(Do IPT)and the cytokinin response factors(Do ARRs).However,silencing Do ERF5 reduced the regeneration rate of PLBs,and downregulated the expression of Do WIND homologs,Do stm and Do ARRs.We demonstrated that Do ERF5 is directly bound to the Do stm promoter and regulates its expression.In addition,overexpression of Do stm in Dendrobium orchid resulted in favorable regeneration of PLBs.Our results clarify that Do ERF5 regulates the regeneration of PLB by enhancing Do stm expression.Our findings provide new insights into how Do ERF5 mediates PLB regeneration and offers technical potential in improving clonal propagation,preservation,and the bioengineering of orchids.

关键词： EMSA ERF transcription factor orchid protocormlikebody stm

Observation of multiple charge density wave phases in epitaxial monolayer 1T-VSe_(2) film

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Chinese Physics B 2022年第10期31卷 137-145页

作者：宗君宇谢阳孟庆豪田启超陈望谢学栋靳少恩张永衡王利任伟沈健陈爱喜王鹏栋李坊森董召阳王灿李建新张翼 National Laboratory of Solid State Microstructure School of PhysicsNanjing UniversityNanjing 210093China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

As a special order of electronic correlation induced by spatial modulation, the charge density wave(CDW) phenomena in condensed matters attract enormous research interests. Here, using scanning-tunneling microscopy in various temperatures, we discover a hidden incommensurate stripe-like CDW order besides the(■) CDW phase at low-temperature of 4 K in the epitaxial monolayer 1T-VSe_(2) film. Combining the variable-temperature angle-resolved photoemission spectroscopic(ARPES) measurements, we discover a two-step transition of an anisotropic CDW gap structure that consists of two parts △_(1) and△_(2). The gap part ?1 that closes around ~ 150 K is accompanied with the vanish of the(√7×√3) CDW phase. While another momentum-dependent gap part △_(2) can survive up to ~ 340 K, and is suggested to the result of the incommensurate CDW phase. This two-step transition with anisotropic gap opening and the resulted evolution in ARPES spectra are corroborated by our theoretical calculation based on a phenomenological form for the self-energy containing a two-gap structure △_(1) +△_(2), which suggests different forming mechanisms between the(√7×√3) and the incommensurate CDW phases. Our findings provide significant information and deep understandings on the CDW phases in monolayer 1T-VSe_(2) film as a two-dimensional(2D) material.

关键词： charge density waves VSe_(2) band structures stm ARPES

Inverse single-site Fe_(1)(OH)_(x)/Pt(111)model catalyst for preferential oxidation of CO in H_(2)

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Nano Research 2022年第1期15卷 709-715页

作者： Chunlei Wang Heloise Tissot Markus Soldemo Junling Lu Jonas Weissenrieder Materials and Nano Physics School of Engineering SciencesKTH Royal Institute of TechnologyStockholm SE-10044Sweden Department of Engineering and Physics Karlstad UniversityKarlstad SE-65188Sweden Department of Chemical Physics Hefei National Laboratory for Physical Sciences at the MicroscaleKey Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei 230026China

Inverse oxide/metal model systems are frequently used to investigate catalytic structure-function relationships at an atomic level.By means of a novel atomic layer deposition process,growth of single-site Fe_(1)O_(x) on a Pt(111)single crystal surface was achieved,as confirmed by scanning tunneling microscopy(stm).The redox properties of the catalyst were characterized by synchrotron radiation based ambient pressure X-ray photoelectron spectroscopy(AP-XPS).After calcination treatment at 373 K in 1 mbar O_(2).the chemical state of the catalyst was determined as Fe^(3+).Reduction in 1 mbar H_(2) at 373 K demonstrates a facile reduction to Fe2+and complete hydroxylation at significantly lower temperatures than what has been reported for iron oxide nanoparticles.At reaction conditions relevant for preferential oxidation of CO in H_(2)(PROX),the catalyst exhibits a Fe3+state(ferric hydroxide)at 298 K while re-oxidation of iron oxide clusters does not occur under the same condition.CO oxidation proceeds on the single-site Fei(OH)3 through a mechanism including the loss of hydroxyl groups in the temperature range of 373 to 473 K,but no reaction is observed on iron oxide clusters.The results highlight the high flexibility of the single iron atom catalyst in switching oxidation states,not observed for iron oxide nanoparticles under similar reaction conditions,which may indicate a higher intrinsic activity of such single interfacial sites than the conventional metal-oxide interfaces.In summary,our findings of the redox properties on inverse single-site iron oxide model catalyst may provide new insights into applied Fe-Pt catalysis.

关键词： inverse single-site model catalyst Fe_(1)O_(x)/PPt(111) PROX atomic layer deposition synchrotron radiation AP-XPS stm

Self-assemblies of TTF derivatives with fluorinated phenyls and pyridine group

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Chinese Chemical Letters 2022年第2期33卷 1100-1104页

作者： Jianghua Fang Xiaoyang Zhu Wendi Luo Jianxun Shi Lejia Wang Bin Tu Qingdao Zeng Xunwen Xiao College of Material Science and Chemical Engineering Ningbo University of TechnologyNingbo 315211China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Zhejiang Pharmaceutical College Ningbo 315100China

The self-assembly characteristics of tetrathiafulvalene(TTF) derivatives molecules 1-3 at the 1-phenyloctane/HOPG(HOPG = highly oriented pyrolytic graphite) interface had been carefully studied by scanning tunneling microscopy(stm) method. The number of F atoms on the phenyl group had significantly affected the self-assembly structures. High-resolution stm images make clear the different assembly structures between the molecules 1-3, which attribute to the different F atom numbers and pyridine group in the molecule. Density functional theory(DFT) calculations have been performed to reveal the formation mechanism.

关键词： TTF Self-assembly stm DFT calculation Hydrogen bonds

Conductance of a single molecule C_(60)-SnPc heterojunction

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Chinese Chemical Letters 2022年第2期33卷 1074-1076页

作者： Yifan Wang Mingjun Zhong Jie Li Hao Tang Richard Berndt Yajie Zhang Shimin Hou Yongfeng Wang Key Laboratory for the Physics and Chemistry of Nanodevices and Center for Carbon-based Electronics Department of ElectronicsPeking UniversityBeijing 100871China CEMES-CNRS Boîte Postale 94347Toulouse 31055France Institut für Experimentelle und Angewandte Physik Christian-Albrechts-Universität zu KielKiel D-24098Germany Beijing Academy of Quantum Information Sciences Beijing 100193China Institute of Spin Science and Technology South China University of TechnologyGuangzhou 511442China

Geometries of molecule-molecule interfaces strongly influence the current passing from one molecule to another. The contact conductance of molecule-molecule junctions which consist of fullerene and tin phthalocyanine molecules is investigated with a low-temperature scanning tunneling microscope. Two types of molecules are deposited onto Cu(111). Fullerene molecules are transferred to tips through controlled contact of stm tips on molecules. The molecule-molecule junctions are formed by approaching fullereneterminated tips to tin phthalocyanine molecules on Cu(111). Our experimental method can be extended to study the intermolecular charge transport of a range of molecular junctions.

关键词： Single-molecule electronics Switch C_(60) Phthalocyanine stm

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Chinese Chemical Letters 2023年第1期34卷 203-205页

作者： Mingjun Zhong Qimeng Wu Liang Ma Jie Li Yifan Wang Yansong Wang Xin Li Yajie Zhang Jingtao Lü Yongfeng Wang Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices Department of ElectronicsPeking UniversityBeijing 100871China Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China School of Physics Institute for Quantum Science and Engineeringand Wuhan National High Magnetic Field CenterHuazhong University of Science and TechnologyWuhan 430074China Beijing Academy of Quantum Information Sciences Beijing 100193China Institute of Spin Science and Technology South China University of TechnologyGuangzhou 511442China

Spin properties of organic molecules have attracted great interest for their potential applications in spintronic devices and quantum computing.Fe-tetraphenyl porphyrin(Fe TPP)is of particular interest for its robust magnetic properties on metallic substrates.Fe TPP is prepared in vacuum via on-surface synthesis.Molecular structure and spin-related transport properties are characterized by low-temperature scanning tunneling microscope and spectroscopy at 0.5 K.Density functional theory calculations are performed to understand molecular adsorption and spin distribution on Au(111).The molecular structure of Fe TPP is distorted upon adsorption on the substrate.Spin excitations of Fe TPP are observed on the Fe atom and high pyrrole groups in differential conductance spectra.The calculated spin density distribution indicates that the electron spin of Fe TPP is mainly distributed on the Fe atom.The atomic transmission calculation indicates that electrons transport to substrate is mediated through Fe atom,when the tip is above the high pyrrole group.

关键词： Spintronics Spin excitation Atomic transmission Fe-tetraphenyl porphyrin stm