Structure, energetics, and low-temperature behaviour of the Au(110) reconstructed surface

Ultraviolet photoelectron spectroscopy (UPS), work function measurements, low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM) have been used to study the adsorption and desorption of 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, [C(2)C(1)Im][Tf(2)N], on the (1×2) clean surface reconstruction of Au(110) in the temperature range 100-674 K. The ionic liquid adsorbed without decomposition, and desorbed without leaving any residue on the surface. For adsorption at room temperature a monolayer of strongly bound ionic liquid was formed with four interface states visible in UP spectra. STM at 100 K showed that the monolayer consisted of well-ordered rows of adsorbed ionic liquid aligned parallel to the close packed rows of surface gold atoms (the [110] direction) with a separation of ×2 (the same as the clean surface reconstruction) between the rows in the orthogonal [001] direction. Multilayer adsorption at room temperature occurred by droplet formation followed by smoothing of the droplets to a layered morphology with time. Heating caused multilayer desorption at temperatures in the 363-383 K range, followed by partial monolayer desorption at 548 K to produce a Au(110)-(1×3) reconstructed surface with sub-monolayer domains of ionic liquid. Desorption of the remaining ionic liquid at 600 K caused the gold surface to reconstruct back to the clean (1×2) reconstruction.

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“…Calculations 27 show that the clean surface (1Â3) reconstruction, Fig. Calculations 27 show that the clean surface (1Â3) reconstruction, Fig.…”

Section: Discussionmentioning

confidence: 91%

Mono- and multi-layer adsorption of an ionic liquid on Au(110)

Foulston

Gangopadhyay

Chiutu

et al. 2012

Phys. Chem. Chem. Phys.

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“…The benefits of using this reconstructed system are its ease of formation from Au(110) single crystals and its open structure, which amounts to a regular array of (111) facets with a step-edge made up of 6-coordinate atoms every fourth atomic row. [11][12][13][14] This high population of low coordination sites provides ample opportunity for comparison with the behavior of adsorbed gold particles, which are also * Author to whom correspondence should be addressed. E-mail: goodman@mail.chem.tamu.edu.…”

Section: Introductionmentioning

confidence: 99%

CO Adsorption on Au(110)−(1 × 2): An IRAS Investigation

2003

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“…Experiment [81 and theory show that in this reconstructed surface every second densely packed row is missing (.missing row model.). In addition, the surface energy of the Au(ll0) surface with (1 x n) superstructure is independent of n ( n s 4 [lll, n< CQ [12]) within the accuracy limits of the calculations. Because of this energetic degeneracy all these reconstructions, which consist of { 111} microfacets of various sizes, can co-exist, causing strong 1D disorder normal to the close-packed direction even at low temperature.…”

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confidence: 73%