期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 14, 期 17, 页码 6054-6066出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp23901a
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资金
- Schools of Chemistry and Physics at Nottingham University
- EPSRC [EP/G007837/1, EP/H010432/1]
- Marie Curie Fellowship via the Framework Programme 6NANOCAGE Early Stage Training Network
- Engineering and Physical Sciences Research Council [EP/I018093/1, EP/G007837/1, EP/H010432/1] Funding Source: researchfish
- EPSRC [EP/I018093/1, EP/H010432/1, EP/G007837/1] Funding Source: UKRI
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][Tf2N], on the (1x2) 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 x2 (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)-(1x3) 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 (1x2) reconstruction.
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