ABCircular GmbH
Transparent and electrical conducting coatings based on nanoparticles and plastic varnish could be a sustainable substitute for supply critical indium-tin-oxide coatings in several high-tech applications (like touch screens or PV modules). For this purpose, in this study 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. Both, electrical conductivity and optical transparency of the coating strongly depends on the architecture of the Fe-Au particles´ alignment i.e., the width, the length, the distance and the number of the formed lines. The alignment (1D structures) depends on the magnetic properties and the size distribution of the Fe-Au particles. The Fe-Au particles used in this work were prepared by pulsed laser ablation in liquid (PLAL) with two different lasers i.e., picosecond (ps) and nanosecond (ns) laser. This method synthesizes different type of particles (within a sample batch) without solvent shell on their surfaces. Investigation on 1D structures (within transparent coatings) from ps-Fe-Au particles and from ns-Fe-Au particles showed different architecture. These findings are direct result of different behavior of the ps-Fe-Au from the ns-Fe-Au particles within magnetic field. Theoretical calculations of electrical conductivity 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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