Interfacial Behavior of Thin Ionic Liquid Films on Mica

详细信息    查看全文

• 作者：Alexey Deyko ; Till Cremer ; Florian Rietzler ; Susan Perkin ; Lorna Crowhurst ; Tom Welton ; Hans-Peter Steinr眉ck ; Florian Maier
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：March 14, 2013
• 年：2013
• 卷：117
• 期：10
• 页码：5101-5111
• 全文大小：563K
• 年卷期：v.117,no.10(March 14, 2013)
• ISSN：1932-7455

文摘

Ultrathin films of two imidazolium-based ionic liquids (ILs), [C₁C₁Im][Tf₂N] (=1-methyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) and [C₄C₁Im][Tf₂N] (=1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) were deposited on mica surfaces by physical vapor deposition in ultrahigh vacuum. Using angle-resolved X-ray photoelectron spectroscopy (ARXPS), the initial wetting behavior, the growth characteristics, and the molecular arrangement of the ions at the interface were investigated. The measurements were performed on freshly air-cleaved mica surfaces with different carbon precoverages. ARXPS clearly reveals that the initial IL adsorption behavior strongly depends on the amount of preadsorbed carbon: On clean mica, 3D growth (complete dewetting) occurs, whereas on a fully carbon covered surface, initially a complete 2D wetting layer forms, followed by 3D growth.