Helical Carbon and Graphite Films Prepared from Helical Poly(3,4-ethylenedioxythiophene) Films Synthesized by Electrochemical Polymerization in Chiral Nematic Liquid Crystals

Helical carbon and graphite films from helical poly(3,4‐ethylenedioxythiophene) (H‐PEDOT) films synthesized through electrochemical polymerization in a chiral nematic liquid‐crystal (N*‐LC) field are prepared. The microscope investigations showed that the H‐PEDOT film synthesized in the N*‐LC has large domains of one‐handed spiral morphology consisting of fibril bundles. The H‐PEDOT films exhibited distinct Cotton effects in circular dichroism spectra. The highly twisted N*‐LC with a helical pitch of smaller than 1 μm produced the H‐PEDOT film with a highly ordered morphology. The spiral morphologies with left‐ and right‐handed screws were observed for the carbon films prepared from the H‐PEDOT films at 800 °C and were well correlated with the textures and helical pitches of the N*‐LCs. The spiral morphologies of the precursors were also retained even in the graphite films prepared from the helical carbon films at 2600 °C. Helikale Kohlenstoff‐ und Graphitfilme werden aus helikalen Poly(3,4‐ethylendioxythiophen)‐Filmen mit einstellbarer Helixrichtung und einstellbarem Helizitätsgrad hergestellt. Die Polymerfilmvorstufen wurden durch asymmetrische elektrochemische Polymerisation in chiralen nematischen Flüssigkristall‐Feldern erzeugt. Die spiralförmigen Morphologien der Vorstufen bleiben in den Graphitfilmen erhalten.