Preparation of ultrafine particle multilayers using the Langmuir–Blodgett technique

Abstract

X-Type Langmuir–Blodgett multilayers of magnetic ultrafine particles such as 100 Å magnetite (Fe₃O₄), 1000 Åγ;-diiron trioxide (γ-Fe₂O₃), 70 Å titanium dioxide (TiO₂), 500 Å barium ferrite (BaFe₁₂O₁₉), and ultraconducting fine-particle Y–Ba–Cu have been prepared. They were dispersed in oleic acid or stearic acid in a ballmill. The dispersed products were assembled into LB multilayers deposited onto a fresh poly(ethylene terephthalate) or MgO film plate. The morphology of the LB multilayers of the ultrafine particles was investigated by high-resolution transmission electron microscopy and scanning electron microscopy and it was found that they have fine lamellar structures. In addition, the obtained multilayers have magnetic anisotropy behaviour observed by magnetic property measurements.