Self-assembly patterning of nanomaterials using electrostatic interaction in solution

Self-assembly patterning of nanomaterials using electrostatic interaction in solution was investigated. The electrostatic adsorption conditions were numerically analyzed by considering the Debye length in solution and the electric charge densities displayed on the surfaces of nanomaterials and substrates. Using the analyzed conditions, nanoparticles as large as φ10 nm were successfully patterned one by one on a substrate. Moreover, increasing electric charge density on the nanoparticle achieved single nanoparticle placement onto an electrostatic adsorption pattern that was larger than the size of the nanoparticle. The electrostatic patterning was applied to various nanomaterials.