Site-Selective Deposition of Magnetite Particulate Thin Films on Patterned Self-assembled Monolayers

Abstract

Magnetite micropatterns were successfully fabricated by the site-selective deposition technique using self-assembled monolayers (SAMs) as templates. Magnetite particles were selectively deposited on Pd catalysts which were adsorbed to the −NH2-terminated surface of a SAM, in an aqueous solution containing iron nitrate and dimethylamine−borane. Pd colloid catalyst particles were adhered to the amino group of a patterned SAM by electrostatic interaction. Crystalline Fe3O4 (magnetite) particulate films were then deposited on amino-group regions by the effect of metal Pd catalyst. Site-selective deposition of crystalline Fe3O4 was thus realized in an aqueous solution. The deposition mechanism of Fe3O4 is discussed in detail in comparison with the deposition of γ-FeOOH in the solution.