Electrodeposition of nano-aluminium coatings from aromatic cation based ionic liquids

摘要

The present paper discuss the electrodeposition of nanometals like aluminium from different imidazolium based chloroaluminate ionic liquids: AlCl_3/1-ethyl-3-methyl-imidazolium chloride (AlCl_3/[EMIm]Cl), AlCl_3/1-benzyl-3-methyl-imidazolium chloride (AlCl_3/ [BzMlm]Cl) and AlCl_3/1,3-dibenzyl-imidazolium chloride (AlCl_3/[DBzlm]Cl) ionic liquids, respectively. This research aims to achieve this goal by investigating the aluminium coatings on gold substrate and study the effect of changing the ionic liquids, like. e.g. changing the organic cation on the properties of the resulting Al-coatings. It was found that the particle size of the Al-deposites was significantly reduced from the micrometer regime down to the nanometer regime when only changing the substituents of the imidazolium cations from EMIm to DBzIm, respectively (Fig.1). This means; the more the aromatic rings in the cation, the finer the particle size is. Whereas, the thickness and the adhesion of the Al-deposits were decreased with the presence of the aromatic rings.