Presentation Information
[9a-B12-9]Ultrathin Ionic Diodes from Zwitterionic Liquid Crystalline Block Copolymers
〇Megu Aoki1, Yuya Ishizaki2, Shusaku Nagano1 (1.Rikkyo Univ., 2.Shinshu Univ.)
Keywords:
Liquid crystalline block copolymers,Betain,ion nanochannel
Liquid crystalline (LC) block copolymers (BCPs) with a zwitterionic block were synthesized from azobenzene and tert-butoxycarbonyl (Boc)-protected lysine monomers by reversible addition–fragmentation chain transfer polymerization. Vertically oriented zwitterionic ion nanochannels in the LC BCP films were induced by visible-light (430 nm) irradiation at the LC temperature, followed by Boc-deprotection via exposure to HCl vapor at room temperature. An ionic diode was fabricated by transferring the PBoc(L)Lys-b-PAz thin film onto an anodic aluminum oxide (AAO) substrate. The ion-current rectification properties were investigated by current–voltage measurements using H-shaped glass reservoirs filled with aqueous KCl solution. Consequently, diode-like ion current rectification properties were observed in 1 mM KCl aqueous solution under asymmetric pH conditions, with one side at pH 3 and the other at pH 10.