Investigation of the structural anisotropy in a self-assembling glycinate layer on Cu(100) by scanning tunneling microscopy and density functional theory calculations

Mikhail Kuzmin, Kimmo Lahtonen, Leena Vuori, Rocio Sánchez-de-Armas, Mika Hirsimäki, Mika Valden

    Research output: Contribution to journalArticleScientificpeer-review

    33 Downloads (Pure)

    Abstract

    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(2x4) and p(2x4) 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.
    Original languageEnglish
    Pages (from-to)111-116
    Number of pages6
    JournalApplied Surface Science
    Volume409
    DOIs
    Publication statusPublished - 4 Mar 2017
    Publication typeA1 Journal article-refereed

    Keywords

    • Cu(100)
    • STM
    • Glycine
    • Glycinate
    • DFT
    • Self-assembly
    • Nanoscience

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Surfaces and Interfaces
    • Condensed Matter Physics
    • Metals and Alloys

    Fingerprint Dive into the research topics of 'Investigation of the structural anisotropy in a self-assembling glycinate layer on Cu(100) by scanning tunneling microscopy and density functional theory calculations'. Together they form a unique fingerprint.

    Cite this