ABCircular GmbH
Transparent and electrical conducting coatings were prepared on a plastic varnish base. For this purpose, ferromagnetic Fe/Au particles were dispersed into a transparent acrylic varnish and the obtained dispersions were coated on transparent plastic substrates. To align particles within the varnish a nondestructive and a simple method was used i.e., magnetic field induced assembly (MFI). During the drying process of the dispersion, the magnetic particles were aligned into 1D structures by a magnetic field. Accordingly, the formed coatings have electrical pathways along the lines and areas of high optical transparency between the lines. The electrical conductivity is correspondingly anisotropic and it depends on the alignment of the Fe/Au particles as well as on the thickness of an oxide shell around the Fe/Au particles. The transparency depends also on the alignment and here especially on the thickness, the distance and the number of the formed lines. The quality of the alignment in turn, depends on the magnetic properties and on the size of the Fe/Au particles. The Fe/Au particles used in this work were prepared by pulsed laser ablation in liquid (PLAL). This method synthesizes core-shell type of particles among others without solvent shell on their surfaces. For particles production two different lasers were used, picosecond (ps) and nanosecond (ns) laser. Investigation on 1D structures (within transparent coatings) from ps Fe/Au particles and from ns Fe/Au particles showed different architecture. Their behavior within magnetic field is different. Theoretical calculations of these coatings are in the antistatic range with R = 107 Ω, but experimental results showed R < 1014 Ω. Still, good transparencies (about 75 %) could be prepared with both dispersions of ps and ns laser generated Fe/Au particles.
Abstract
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Poster
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