Structural characterization of aldehyde-terminated self-assembled monolayers

Alexandra Riposan, Yan Li, Yih Horng Tan, Giulia Galli, Gang-yu Liu

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The structure of aldehyde-terminated alkanethiol self-assembled monolayers (SAMs) on Au(111) is investigated using scanning tunneling microscopy (STM), atomic fdrce microscopy (AFM), and density functional theory (DFT) calculations. For the first time, the structures of aldehyde-terminated SAMs are revealed with molecular resolution. SAMs of 11-mercapto-l-undecanal exhibit the basic (√3 × √3)R30° periodicity and form various c(4×2) superstructures upon annealing. In conjunction with DFT studies, the models of the (√3 × √3)R30° and the c(4×2) superstructures are constructed. In comparison with alkanethiol SAMs, the introduction of aldehyde-termini results in smaller domain size, lower degree of long-range order, large coverage of disordered areas, and higher density of missing molecules and other point defects within domains of closely packed molecules. The origin of these structural differences is mainly attributed to the strong dipole-dipole interactions among the aldehyde termini.

Original languageEnglish (US)
Pages (from-to)12727-12739
Number of pages13
JournalJournal of Physical Chemistry A
Volume111
Issue number49
DOIs
StatePublished - Dec 13 2007

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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