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Investigation of the structural anisotropy in a self-assembling glycinate layer on Cu(100) by scanning tunneling microscopy and density functional theory calculations
Tampere Univ Technol, Optoelect Res Ctr, Surface Sci Lab, POB 692, FI-33101 Tampere, Finland.;Russian Acad Sci, Ioffe Phys Tech Inst, 26 Polytekhnicheskaya, St Petersburg 194021, Russia..
Tampere Univ Technol, Optoelect Res Ctr, Surface Sci Lab, POB 692, FI-33101 Tampere, Finland..
Tampere Univ Technol, Optoelect Res Ctr, Surface Sci Lab, POB 692, FI-33101 Tampere, Finland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2017 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 409, 111-116 p.Article in journal (Refereed) Published
Abstract [en]

Self-assembling organic molecule-metal interfaces exhibiting free-electron like (FEL) states offers an attractive bottom-up approach to fabricating materials for molecular electronics. Accomplishing this, however, requires detailed understanding of the fundamental driving mechanisms behind the self assembly process. For instance, it is still unresolved as to why the adsorption of glycine ([NH2(CH2)COOH) on isotropic Cu(100) single crystal surface leads, via deprotonation and self-assembly, to a glycinate ([NH2(CH2)COO-]) layer that exhibits anisotropic FEL behavior. Here, we report on bias-dependent scanning tunneling microscopy (STM) experiments and density functional theory (DFT) calculations for glycine adsorption on Cu(100) single crystal surface. We find that after physical vapor deposition (PVD) of glycine on Cu(100), glycinate self-assembles into an overlayer exhibiting c(2 x 4) and p(2 x 4) symmetries with non-identical adsorption sites. Our findings underscore the intricacy of electrical conductivity in nanomolecular organic overlayers and the critical role the structural anisotropy at molecule-metal interface plays in the fabrication of materials for molecular electronics.

Place, publisher, year, edition, pages
2017. Vol. 409, 111-116 p.
Keyword [en]
Cu(100), Glycine, Adsorption, STM, DFT, Self-assembly
National Category
Condensed Matter Physics Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-322502DOI: 10.1016/j.apsusc.2017.03.005ISI: 000400223900017OAI: oai:DiVA.org:uu-322502DiVA: diva2:1103517
Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

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Sánchez-de-Armas, Rocío

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