Park Junsu, Sasaki Yui, Ishii Yoshiki, Murayama Shunsuke, Ohshiro Kohei, Nishiura Kengo, Ikura Ryohei, Yamaguchi Hiroyasu, Harada Akira, Matsuba Go, Washizu Hitoshi, Minami Tsuyoshi, Takashima Yoshinori
Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
Forefront Research Center, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
ACS Appl Mater Interfaces. 2023 Aug 23;15(33):39777-39785. doi: 10.1021/acsami.3c04395. Epub 2023 Aug 11.
We report unique conductive leaf-inspired (in particular, stomata-inspired) supramolecular gas sensors in which acetylated cyclodextrin derivatives rule the electric output. The gas sensors consist of polymers bearing acetylated cyclodextrin, adamantane, and carbon black. Host-guest complexes between acetylated cyclodextrin and adamantane corresponding to the closed stomata realize a flexible polymeric matrix. Effective recombination of the cross-links contributes to the robustness. As gas sensors, the supramolecular materials detect ammonia as well as various other gases at 1 ppm in 10 min. The free acetylated cyclodextrin corresponding to open stomata recognized the guest gases to alter the electric resistivity. Interestingly, the conductive device failed to detect ammonia gases at all without acetylated cyclodextrin. The molecular recognition was studied by molecular dynamics simulations. The gas molecules existed stably in the cavity of free acetylated cyclodextrin. These findings show the potential for developing wearable gas sensors.
我们报道了独特的受叶片启发（特别是受气孔启发）的超分子气体传感器，其中乙酰化环糊精衍生物控制着电输出。这些气体传感器由带有乙酰化环糊精、金刚烷和炭黑的聚合物组成。乙酰化环糊精与金刚烷之间对应于关闭气孔的主客体复合物实现了一种柔性聚合物基质。交联的有效重组有助于增强其稳定性。作为气体传感器，这些超分子材料在10分钟内能够检测出浓度为1 ppm的氨气以及各种其他气体。对应于开放气孔的游离乙酰化环糊精识别客体气体，从而改变电阻率。有趣的是，没有乙酰化环糊精时，该导电装置根本无法检测氨气。通过分子动力学模拟对分子识别进行了研究。气体分子稳定存在于游离乙酰化环糊精的腔内。这些发现表明了开发可穿戴气体传感器的潜力。
