Lexow M, Talwar T, Heller B, May B, Bhuin RG, Maier F, Steinrück HP (2018)
Publication Status: Published
Publication Type: Journal article
Publication year: 2018
Publisher: ROYAL SOC CHEMISTRY
Book Volume: 20
Pages Range: 12929-12938
Journal Issue: 18
DOI: 10.1039/c8cp01411f
Various amounts of the ionic liquids (ILs) [C(1)C(1)Im][Tf2N] and [C(8)C(1)Im][Tf2N] were deposited in vacuo by physical vapour deposition (PVD) on single crystalline Ag(111) at room temperature and subsequently monitored by angle-resolved X-ray photoelectron spectroscopy (ARXPS) as a function of time. For very low coverages of up to one closed molecular layer, an initial wetting layer was rapidly formed for both ILs. Deposition of higher amounts of [C(1)C(1)Im][Tf2N] revealed an initial three-dimensional film morphology. On the time scale of hours, characteristic changes of the XPS signals were observed. These are interpreted as island spreading and a transformation towards a nearly two dimensional [C(1)C(1)Im][Tf2N] film as the final state. In contrast, a film morphology close to 2D was found from the very beginning for [C(8)C(1)Im][Tf2N] deposited on Ag(111) demonstrating the influence of the alkyl chain length on the growth kinetics. These studies also highlight the suitability of time-resolved ARXPS for the investigation of IL/solid interfaces, which play a crucial role in IL thin film applications such as in catalysis, sensor, lubrication, and coating technologies.
APA:
Lexow, M., Talwar, T., Heller, B., May, B., Bhuin, R.G., Maier, F., & Steinrück, H.-P. (2018). Time-dependent changes in the growth of ultrathin ionic liquid films on Ag(111). Physical Chemistry Chemical Physics, 20(18), 12929-12938. https://dx.doi.org/10.1039/c8cp01411f
MLA:
Lexow, Matthias, et al. "Time-dependent changes in the growth of ultrathin ionic liquid films on Ag(111)." Physical Chemistry Chemical Physics 20.18 (2018): 12929-12938.
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