Abstract
Beside their industrial applications, where their bulk physico-chemical properties are relevant, room-temperature ionic liquids (ILs) can also be used as electrolytes in several devices aimed at conversion and storage of energy, such as electrochemical supercapacitors, Gratzel solar cells and batteries, as well as lubricants in micro electromechanical devices. In these devices ILs are in form of thin films, or they can be spatially confined in nanoscale pores, therefore a key role is played by their interfacial, rather than bulk, properties, specifically pertaining to the solid-liquid interface. In particular, structural-morphological and electrical properties of the first few nanometers of ILs interacting with surfaces of solid electrodes are expected to have the strongest impact on device performance. Here we report on the characterization of interfacial properties of [Bmim][NTf2] supported on different solid silica and mica surfaces carried out primarily by advanced atomic force microscopy (AFM) techniques.
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