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

AuthorsLi, Zhe; Schouteden, Koen; Iancu, Violeta; Janssens, Ewald; Lievens, Peter; Haesendonck, Chris Van; Cerdá, Jorge I.
KeywordsSTM simulation
Scanning tunneling microscopy (STM)
Functionalized STM-tip
Ultrathin insulating films
Issue DateJul-2015
CitationNano Research 8(7): 2223-2230 (2015)
AbstractCl-functionalized scanning tunneling microscopy (STM) tips are fabricated by modifying a tungsten STM tip in situ on islands of ultrathin NaCl(100) films on Au(111) surfaces. The functionalized tips are used to achieve clear atomicresolution imaging of NaCl(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 Cl 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.
Publisher version (URL)https://doi.org/10.1007/s12274-015-0733-y
Identifiersdoi: 10.1007/s12274-015-0733-y
e-issn: 1998-0000
issn: 1998-0124
Appears in Collections:(ICMM) Artículos
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