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Title: A comparative study of honeycomb-like 2D π-conjugated metal–organic framework chemiresistors: conductivity and channels
Authors: Yao, Ming-Shui
Wang, Ping
Gu, Yi-Fan
Koganezawa, Tomoyuki
Ashitani, Hirotaka
Kubota, Yoshiki
Wang, Zao-Ming
Fan, Ze-Yu
Otake, Ken-ichi
Kitagawa, Susumu  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-6956-9543 (unconfirmed)
Author's alias: 大竹, 研一
北川, 進
Issue Date: 14-Oct-2021
Publisher: Royal Society of Chemistry (RSC)
Journal title: Dalton Transactions
Volume: 50
Issue: 38
Start page: 13236
End page: 13245
Abstract: Two-dimensional (2D) π-conjugated conductive metal–organic frameworks (cMOFs, 2DπcMOF) with modulated channel sizes and a broad conductivity range have been reported in the last decade. In contrast, the corresponding comparative studies on their effects on chemiresistive sensing performances, which measure the resistive response toward external chemical stimuli, have not yet been reported. In this work, we sought to explore the structure–performance relationships of honeycomb-like 2D π-conjugated cMOF chemiresistive gas sensors with channel sizes less than 2 nm (the mass transport issue) and broad conductivity in the range from ∼10⁻⁸ S cm⁻¹ to 1 S cm⁻¹ (the charge transport issue). As a result, we found that the cMOF with a lower conductivity facilitates the much more sensitive response toward the charge transfer of the adsorbed gases (relative increases in resistance: R = 63.5% toward 100 ppm of NH₃ for the as prepared Cu–THQ sensor with the conductivity of ∼10⁻⁸ S cm⁻¹). Interestingly, the cMOF with a medium channel size (Cu–THHP–THQ) exhibited the fastest response speed in sensing, although it contains H₂en²⁺ as neutralizing counterions in the channels. From the evaluation of the pore size distribution, it is found that the overall porosity (meso- & micro-pores) of cMOFs, rather than the pore size of the honeycomb structure, would determine their sensing speed. When comparing the performance of two different morphologies of nanorods (NRs) and nanosheets (NSs), NRs showed a slower response and extended recovery time, which can be ascribed to the slower gas diffusion in the more extended 1D channel. Altogether, our results demonstrate the first systematic studies on the effect of various structural parameters on the chemiresistive sensor performance of cMOFs.
Rights: This is an accepted manuscript of this article, which has been published in final form at DOI https://doi.org/10.1039/D1DT02323C.
The full-text file will be made open to the public on 06 Sep 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/268730
DOI(Published Version): 10.1039/D1DT02323C
PubMed ID: 34485999
Appears in Collections:Journal Articles

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