Pearl chain formation of nanoparticles in microelectrode gaps by dielectrophoresis

The integration of molecular structures into microscopic electrode arrays is achieved by dielectrophoresis of gold nanoparticles in electrode gaps. Using microelectrodes realized by photolithography, we demonstrate here the generation of pearl chain arrangements of nanoparticles in structures accessible for standard technologies. To preserve the individual particle structures in the final nanowire arrangement, various strategies were employed. An electrical characterization of the pearl chains yielded an Ohmic behavior. The effect of increased current on these structures is studied at the ultramicroscopic level.