Presentation Information
[23a-1BC-10]Ionic Diodes from Hybrid Laminates of Nanoporous Thin Films and Polyelectrolyte Layer-by-Layer Assemblies
〇Yuya Ishizaki1,2, Narumi Kumakura2, Shunsuke Yamamoto2, Shusaku Nagano1, Masaya Mitsuishi2 (1.Rikkyo Univ., 2.Tohoku Univ.)
Keywords:
Ion current rectification,Ultrathin film,Finite element method
Nanofluidic ionic diodes have attracted much attention due to their unique functions as unidirectional ion transportation ability and promising applications from molecular sensing, energy harvesting to emerging neuromorphic devices. However, it remains a challenge to fabricate diode-like nanofluidic system with ultrathin film thickness < 100 nm. We describe herein the formation of ultrathin ionic diodes from hybrid laminates of nanoporous (NP) SiO2 films and polymer layer-by-layer (LbL) nanofilms. Thin film ionic diodes were prepared by integration of polyelectrolytes onto photo-oxidized NP SiO2 films obtained from silsesquioxane-containing block copolymer thin films as a template. The obtained thin film ionic diodes exhibited ion current rectification (ICR) properties and ICR factor = ~20 under asymmetric pH conditions. We concluded that this ICR behavior arise from effective ion accumulation and depletion at the interface of NP SiO2 films and LbL nanofilms by combining the experimental data and finite element method simulation. These results demonstrate that the hybrid laminates of NP SiO2 and polyelectrolyte LbL nanofilms have potentials to applications for the (bio)sensing materials and integrated ionic circuits for seamless connection of human-machine interfaces.