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Nano Research

Article Title

Redox switch of ionic transport in conductive polypyrrole-engineered unipolar nanofluidic diodes

Authors

Qianqian Zhang, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, China School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
Zhen Zhang, Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Hangjian Zhou, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, China
Zhiqiang Xie, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, China School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
Liping Wen, Laboratory of Bioinspired Smart Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Zhaoyue Liu, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, China
Jin Zhai, Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191, China
Xungang Diao, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China

Keywords

redox switch, polypyrrole, nanofluidic diodes, ion rectification, ion gating

Abstract

ABSTRACT Controlling ion transport in nanoconfined spaces is a key task for the creation of smart nanofluidic devices. In this work, redox-active polypyrrole (PPy) polymers are introduced into anodic aluminum oxide (AAO) nanochannels to form smart unipolar nanofluidic diodes (UNDs) for the first time. The ionic transport behavior of the present polypyrrole-engineered UNDs can be controlled through the redox reactions of PPy. Under an applied oxidation potential, conductive PPy exhibits several redox states carrying different charges, following the formation of polarons and bipolarons with different oxidation states. Combined with the asymmetric distribution of PPy in the AAO nanochannels, the UNDs investigated here exhibit redox-switchable ion rectification and ion-gating properties. The influence of the charge asymmetry of the UNDs on their ionic transport behavior is assessed by precisely controlling the length of oxidized PPy segments in the AAO nanochannels and by carrying out theoretical simulations based on the Poisson and Nernst–Planck (PNP) equations.

Graphical Abstract

Publisher

Tsinghua University Press

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