High-Performance, Flexible NO2 Chemiresistors Achieved by Design of Imine-Incorporated n-Type Conjugated Polymers

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Flexible and mechanically robust gas sensors are the key technologies for wearable and implantable electronics. Herein, the authors demonstrate the high-performance, flexible nitrogen dioxide (NO2) chemiresistors using a series of n-type conjugated polymers (CPs: PNDIT2/IM-x) and a polymer dopant (poly(ethyleneimine), PEI). Imine double bonds (C = N) are incorporated into the backbones of the CPs with different imine contents (x) to facilitate strong and selective interactions with NO2. The PEI provides doping stability, enhanced electrical conductivity, and flexibility. As a result, the NO2 sensors with PNDIT2/IM-0.1 and PEI (1:1 by weight ratio) exhibit outstanding sensing performances, such as excellent sensitivity (Delta R/R-b = 240% @ 1 ppm), ultralow detection limit (0.1 ppm), high selectivity (Delta R/R-b < 8% @ 1 ppm of interfering analytes), and high stability, thereby outperforming other state-of-the-art CP-based chemiresistors. Furthermore, the thin film of PNDIT2/IM-0.1 and PEI blend is stretchable and mechanically robust, providing excellent flexibility to the NO2 sensors. Our study contributes to the rational design of high-performance flexible gas sensors.
Publisher
WILEY
Issue Date
2022-05
Language
English
Article Type
Article
Citation

ADVANCED SCIENCE, v.9, no.14, pp.2200270

ISSN
2198-3844
DOI
10.1002/advs.202200270
URI
http://hdl.handle.net/10203/296679
Appears in Collection
ME-Journal Papers(저널논문)MS-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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