Nanoparticle Synthesis Using Reversible Ionic Liquids

Applications of metal nanoparticles have attracted significant attention due to their shape and size dependent properties. Current methods for nanoparticle synthesis remain cost-, energy- and time-intensive. This work will present Au nanoparticle synthesis with reversible ionic liquids, formed upon the addition of CO₂ to a silylated amine precursor. The resulting ion pair allows for reverse micelle formation. Heating the solution to a moderate temperature results in the reversal of the ionic liquid and the break-up of the reverse micelles, for subsequent characterization or deposition of the Au nanoparticles. Formation of metal nanoparticles without the requirement of capping agents or surfactants, sometimes in large excess, could result in significant energy and waste reduction. We have tuned a number of process parameters to demonstrate the formation of monodisperse Au nanoparticles.