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Chemically modified STM tips for atomic-resolution imaging of ultrathin NaCI films

Nano Research 2015年第7期8卷 2223-2230页

作者： Zhe Li koen schouteden Violeta lancu Ewald Janssens Peter Lievens Chris Van Haesendonck Jorge I. Cerda Solid-State Physics and Magnetism Section KU Leuven BE-3001 Leuven Belgium Instituto de Ciencia de Materiales ICMM-CSIC Cantoblanco 28049 Madrid Spain

Cl-functionalized scanning tunneling microscopy （STM） tips are fabricated by modifying a tungsten STM tip in situ on islands of ultrathin NaCI（100） films on Au（111） surfaces. The functionalized tips are used to achieve clear atomic- resolution imaging of NaCI（100） islands. In comparison with bare metal tips, the chemically modified tips yield drastically enhanced spatial resolution as well as contrast reversal in STM topographs, implying that Na atoms, rather than C1 atoms, are imaged as protrusions. STM simulations based on a Green＇s function formalism reveal that the experimentally observed contrast reversal in the STM topographs is due to the highly localized character of the Cl-pz states at the tip apex. An additional remarkable characteristic of the modified tips is that in dI/dV maps, a Na atom appears as a ring with a diameter that depends crucially on the tip-sample distance.

关键词： scanning tunneling microscopy(STM)ultrathin insulating films functionalized stm-tip sm simulation

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Size-dependent dissociation of small cobalt clusters on ultrathin NaCI films

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Nano Research 2017年第5期10卷 1832-1839页

作者： Zhe Li Hsin-Yi Tiffany Chen koen schouteden Thomas Picot Arnaud Hillion Gianfranco Pacchioni Chris Van Haesendonck Ewald Janssens Peter Lievens Laboratory of Solid-State Physics and Magnetism KU Leuven BE-3001 Leuven Belgium Key Laboratory of Materials Modification by Laser Ion and Electron Beams Ministry of Education Dalian University of Technology Dalian 116024 China Department of Engineering and System Science "National Tsing Hua University" Hsinchu 30013 Taiwan China Dipartimen to di Scienza dei Materiali Universita di Milano-Bicocca 1-20125 Milano Italy

Mass-selected anionic cobalt clusters of two different sizes （Co2 and Co13） were deposited onto ultrathin NaC1 films grown on an Au（111） substrate. Using scanning tunneling microscopy experiments and density functional theory simulations, we show that the deposited Co2 cluster dissociates and that the resulting Co atoms dope the NaCI surface by substituting Na ions. In contrast, the larger Co13 cluster does not dissociate and remains stable on top of the NaC1 film. The size- dependent fragmentation of clusters is an important aspect in the understanding of the chemical interaction between size-selected small aggregates of atoms and supporting surfaces.

关键词： cobalt clusters mass selection size-dependentfragmentation scanning tunnelingmicroscopy density functional theory

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