Functionalization of Oxide Surfaces through Reaction with 1,3-Dialkylimidazolium Ionic Liquids

详细信息    查看全文

• 作者：Stefan Schernich ; Mathias Laurin ; Yaroslava Lykhach ; Hans-Peter Steinr眉ck ; Nataliya Tsud ; Tom谩拧 Sk谩la ; Kevin C. Prince ; Nicola Taccardi ; Vladim铆r Matol铆n ; Peter Wasserscheid ; J枚rg Libuda
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2013
• 出版时间：January 3, 2013
• 年：2013
• 卷：4
• 期：1
• 页码：30-35
• 全文大小：473K
• 年卷期：v.4,no.1(January 3, 2013)
• ISSN：1948-7185

文摘

Practical applications of ionic liquids (ILs) often involve IL/oxide interfaces, but little is known regarding their interfacial chemistry. The unusual physicochemical properties of ILs, including their exceptionally low vapor pressure, provide access to such interfaces using a surface science approach in ultrahigh vacuum (UHV). We have applied synchrotron radiation photoelectron spectroscopy (SR-PES) to the study of a thin film of the ionic liquid [C₆C₁Im][Tf₂N] prepared in situ in UHV on ordered stoichiometric CeO₂(111) and partially reduced CeO_2鈥?i>x. On the partially reduced surface, we mostly observe decomposition of the anion. On the stoichiometric CeO₂(111) surface, however, a layer of surface-anchored organic products with high thermal stability is formed upon reaction of the cation. The suggested acid鈥揵ase reaction pathway may provide well-defined functionalized IL/solid interfaces on basic oxides.

Keywords:

photoelectron spectroscopy (PES; XPS); synchrotron light; resonant photoelectron spectroscopy; surface science; cerium oxide; thin film; chemical reaction