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Fabricating electrochromic thin films based on metallo-polymers using layer-by-layer self-assembly: An attractive laboratory experiment

: Schott, Marco; Beck, Matthias; Winkler, Franziska; Lorrmann, Henning; Kurth, Dirk Günter


Journal of chemical education : JCE 92 (2015), No.2, pp.364-367
ISSN: 0021-9584
ISSN: 1938-1328
Journal Article
Fraunhofer ISC ()

Metallo-supramolecular polyelectrolytes (MEPE) based on iron(II)-acetate and 1,4-bis(2,2´:6´,2´´-terpyridin-4´-yl)benzene are assembled by layer-by-layer deposition on transparent electrode surfaces. When a potential is applied, the color of the film can be switched from blue to transparent. Due to the strong absorption and the fast switching speed, the color change is readily observed with the eye. The device shows reversible switching and long-term stability. The experiment demonstrates the basic concept of electrochromic windows, an upcoming technology.