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Ultrathin Ionic Diodes with Electrostatically Heterogeneous Hybrid Interfaces of Nanoporous SiO 2 Nanofilms and Polymer Layer-by-Layer Multilayers.

Authors :
Ishizaki-Betchaku Y
Kumakura N
Yamamoto S
Nagano S
Mitsuishi M
Source :
Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Oct; Vol. 20 (40), pp. e2404306. Date of Electronic Publication: 2024 Jul 03.
Publication Year :
2024

Abstract

Nanofluidic ionic diodes have attracted much attention due to their unique functions as unidirectional ion transportation ability and promising applications from molecular sensing, and energy harvesting to emerging neuromorphic devices. However, it remains a challenge to fabricate diode-like nanofluidic systems with ultrathin film thickness <100 nm. Herein the formation of ultrathin ionic diodes from hybrid nanoassemblies of nanoporous (NP) SiO <subscript>2</subscript> nanofilms and polyelectrolyte layer-by-layer (LbL) multilayers is described. Ultrathin ionic diodes are prepared by integrating polyelectrolyte multilayers onto photo-oxidized NP SiO <subscript>2</subscript> nanofilms obtained from silsesquioxane-containing block copolymer thin films as a template. The obtained ultrathin ionic diodes exhibit ion current rectification (ICR) properties with high ICR factor = ≈20 under low ionic strength and asymmetric pH conditions. It is concluded that this ICR behavior arises from effective ion accumulation and depletion at the interface of NP SiO <subscript>2</subscript> nanofilms and LbL multilayers attributed to high ion selectivity by combining the experimental data and theoretical calculations using finite element methods. These results demonstrate that the hybrid nano assemblies of NP SiO <subscript>2</subscript> nanofilms and polyelectrolyte LbL multilayers have potential applications for (bio)sensing materials and integrated ionic circuits for seamless connection of human-machine interfaces.<br /> (© 2024 The Author(s). Small published by Wiley‐VCH GmbH.)

Details

Language :
English
ISSN :
1613-6829
Volume :
20
Issue :
40
Database :
MEDLINE
Journal :
Small (Weinheim an der Bergstrasse, Germany)
Publication Type :
Academic Journal
Accession number :
38958070
Full Text :
https://doi.org/10.1002/smll.202404306