An approach for transparent and electrically conducting coatings: A transparent plastic varnish with nanoparticulate magnetic additives

THIN SOLID FILMS

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Article

Beck, G.¹  Barcikowski, S.^2,3  Chakravadhanula, V. S. K.⁴  Comesana-Hermo, M.⁵  Deng, M.⁶  Farle, M.⁵  Hilgendorff, M.⁷  Jakobi, J.^2,3  Janek, J.⁸  Kienle, L.⁶  Mogwitz, B.⁸  Schubert, T.⁹  Stiemke, F.⁹ 

[1] Univ Augsburg, Inst Phys, Chair Resource Strategy, D-86159 Augsburg, Germany

[2] Univ Duisburg Essen, Chair Tech Chem, D-45141 Essen, Germany

[3] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-45141 Essen, Germany

[4] Karlsruhe Inst Technol, Helmholtz Inst Ulm, D-89081 Ulm, Germany

[5] Univ Duisburg Essen, Expt Phys, D-47048 Duisburg, Germany

[6] Univ Kiel, Chair Synth & Real Struct, D-24143 Kiel, Germany

[7] Free Univ Berlin, Expt Phys, D-14195 Berlin, Germany

[8] Univ Giessen, Inst Phys Chem, D-35392 Giessen, Germany

[9] IOLITEC Ion Liquids Technol GmbH, D-74076 Heilbronn, Germany

关键词: Transparent conductive coatings;    Magnetic nanoparticles;    Magnetic nanowires;    Transparent varnish;    Carbon nanotubes;   

DOI  :  10.1016/j.tsf.2015.10.059

来源: Elsevier

【 摘 要 】

For the purpose of preparing TCCs(=transparent and electrical conducting coatings), metallic and ferromagnetic nano-additives were dispersed into a transparent varnish and the obtained dispersions were coated on transparent plastic substrates. During hardening of the dispersion the magnetic nano-additives were aligned by a magnetic field. The resulting coatings have electrical pathways along lines of nano-additive chains and are highly transparent in the areas between the lines. Therefore, the electrical conductivity is anisotropic, and it depends on the alignment of the nano-additives (i.e. on the distance between the nano-additives within the chains and the length of the lines) as well as on the thickness of an oxide and/or solvent shell around the nano-additives. The transparency depends also on the alignment and here especially on the thickness and the distance between the formed lines. The quality of the alignment in turn, depends on the magnetic properties and on the size of the particles. We used commercial plastic varnishes, which form electrically isolating (>= 10(-12) S/m) and transparent (about 90% transparency) coatings, and the following magnetic additives: Co-, Fe-, CoPt3, CoPt3@Au- and Fe@Au-nanoparticles as well as CoNi-nanowires. Coatings with Fe@Au-nanoparticles show the best results in terms of the electrical conductivity (10(-5) S/m-10(-6) S/m) at transparencies above 70%. Furthermore, in addition to the magnetic nano-additives, transparent additives (Al2O3-particles) and non-magnetic, but better conducting additives (carbon-nanotubes) were added to the varnish to increase the transparency and the electrical conductivity, respectively. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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