Annealing effect for self-assembled monolayers formed from terphenylethanethiol on Au(111)

Physical Chemistry Chemical Physics : PCCP
Waleed AzzamAsif Bashir

Abstract

The structure and morphology of self-assembled monolayers (SAMs) prepared on Au(111) from solutions of terphenylethanethiol (TP2) at room temperature and subsequently annealed at temperatures up to 473 K were investigated using scanning tunneling microscopy. This system is of particular interest because of its metastable character, holding potential for its tailored modification. Indeed, the data suggest the formation of several different structural phases, viz. α, β, γ, and δ, appearing progressively for the as-prepared and annealed samples. The consecutive α → β → γ → δ phase transitions occurring with increasing annealing temperature involved a continuous reduction of the molecular packing density and significant changes in the substrate morphology. The major morphological changes were the appearance and progressive growth of monoatomic gold islands, on top of which the TP2 phases were formed, representing in all cases a single domain for a particular island and restricted only by the island size. For all the phases, inclined molecular orientation was assumed while a so-called lying-down arrangement, in which the TP2 backbones are orientated parallel to the gold surface, was not observed. A nearly complete desorption of the ...Continue Reading

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Citations

Oct 6, 2020·Physical Chemistry Chemical Physics : PCCP·Faro HechenbergerPaul Scheier
Aug 4, 2021·The Journal of Chemical Physics·Joscha HekelePeter Kratzer

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Methods Mentioned

BETA
thermal treatment
scanning tunneling microscopy
infrared spectroscopy
X-ray

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