Molecular-level electrochemical doping for fine discrimination of volatile organic compounds in organic chemiresistors

Kwon, Sooncheol; Pak, Yusin; Kim, Bongseong; Park, Byoungwook; Kim, Jehan; Kim, Geunjin; Jo, Yong Ryun; Limbu, Saurav; Stewart, Katherine; Kim, Hyeonghun; Kim, Bong Joong; Jang, Soo Young; Kang, Hongkyu; Min, Jung Wook; Kim, Ji Seon; Jung, Gun Young; Lee, Kwanghee

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2021-07-27

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Article

KAUST Department

Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST) Thuwal Kingdom of Saudi Arabia

Date

2020

Embargo End Date

2021-07-27

Submitted Date

2020-06-02

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http://hdl.handle.net/10754/665072

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Abstract

Printable organic sensors fabricated from solution-processed π-conjugated polymers (π-CPs) are promising candidates to detect volatile organic compounds (VOCs) due to the intriguing physical, chemical and electronic properties of π-CPs. These devices, often termed organic chemiresistors, require good sensing capabilities to transduce stimuli from specific VOCs at low concentrations into analytical electric signals. However, discriminating such VOCs using organic chemiresistors has proven very challenging. Herein, we report that the molecular-level electrochemical doping of π-CPs with solid-state ionic liquids (SILs) significantly improves their electrical conductivity (∼10-1 S cm-1) and selective VOC interactions, which can be manipulated through different π-CPs:SIL blend ratios. These characteristics enable the fine discrimination of VOCs at concentrations in the parts-per-billion (ppb) range under low power consumption (

Citation

Kwon, S., Pak, Y., Kim, B., Park, B., Kim, J., Kim, G., … Lee, K. (2020). Molecular-level electrochemical doping for fine discrimination of volatile organic compounds in organic chemiresistors. Journal of Materials Chemistry A, 8(33), 16884–16891. doi:10.1039/d0ta05530a

Sponsors

S. K. and Y. P. contributed equally to this work. This research was supported by the Global Research Laboratory Program of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2017K1A1A2013153); the Young Researchers Program of the NRF funded by the Ministry of Science, ICT & Future Planning (NRF-2018R1C1B6006177); and GIST Research Institute (GRI), RISE grant funded by the GIST in 2020. G. Y. Jung was supported by the Pioneer Research Center Program (NRF-2016M3C1A3908893) of the National Research Foundation of Korea (NRF), which is funded by the Ministry of Science and ICT & Future Planning. We thank the Heeger Center for Advanced Materials (HCAM) and the GIST-ICL International Collaboration R&D Center at Gwangju Institute of Science and Technology (GIST) of Korea for assistance with device fabrication and characterization. We acknowledge the UK EPSRC for studentships under the Centre for Doctoral Training (CDT) in Plastic Electronics (EP/G037515/1).