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タイトル: | A comparative study of honeycomb-like 2D π-conjugated metal–organic framework chemiresistors: conductivity and channels |
著者: | 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 https://orcid.org/0000-0001-6956-9543 (unconfirmed) |
著者名の別形: | 大竹, 研一 北川, 進 |
発行日: | 14-Oct-2021 |
出版者: | Royal Society of Chemistry (RSC) |
誌名: | Dalton Transactions |
巻: | 50 |
号: | 38 |
開始ページ: | 13236 |
終了ページ: | 13245 |
抄録: | 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. |
著作権等: | 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(出版社版): | 10.1039/D1DT02323C |
PubMed ID: | 34485999 |
出現コレクション: | 学術雑誌掲載論文等 |
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