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Chemiresistors for the Real-Time Wireless Detection of Anions

机译：用于负离子实时无线检测的化学传感器

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Reported is an electrical transduction platform for real-time wireless anion sensing using single-walled carbon nanotubes (SWCNTs) noncovalently functionalized with squaramide-based anion binding selectors. Systematically studied are anion-binding properties and efficiency of the electrical transduction of the functionalized SWCNT composites using the squaramide-based selectors with two similar electron-withdrawing groups, 3,5-bis(trifluoromethyl)benzyl (1) and 3,5-bis(trifluoromethyl)phenyl (2), which induce hydrogen-bonding interaction with anions and deprotonation of a squaramide N-H proton upon addition of acetate (AcO-), respectively. Charge transduction occurs with AcO- as a result of charge transfer from the deprotonated selector 2, whereas less sensitive transduction is observed with selector 1 via hydrogen-bonding interaction. These results provide guidelines to efficiently transduce the chemical interaction between selectors and anions to create resistive transduction with functionalized SWCNTs. Electron-withdrawing groups adjacent to the squaramide as well as proximate cationic pyridyl groups, enhance the anion binding affinity and also lower the selector's pK(a). The chemiresistive sensor arrays are readily integrated with a wireless sensing module and demonstrated real-time sensing of multiple anions with a smartphone readout.
机译：报告的是一种电转导平台，用于实时无线阴离子感测，该感测平台使用单壁碳纳米管（SWCNT）进行非共价键化，而单壁碳纳米管通过基于方胺的阴离子结合选择剂进行共价功能化。使用具有两个相似的吸电子基团，3,5-双（三氟甲基）苄基（1）和3,5-bis的基于方胺的选择剂，系统地研究了功能化SWCNT复合材料的阴离子结合性能和电转换效率（三氟甲基）苯基（2），分别通过添加乙酸盐（AcO-）诱导与阴离子的氢键相互作用和方酰胺NH质子的去质子化。由于来自脱质子化选择器2的电荷转移，AcO-发生了电荷转导，而选择器1通过氢键相互作用观察到了较不敏感的转导。这些结果为有效转导选择剂和阴离子之间的化学相互作用以利用功能化的SWCNT创建电阻转导提供了指导。与方酸酰胺相邻的吸电子基团以及最接近的阳离子吡啶基，可增强阴离子结合亲和力，并降低选择剂的pK（a）。化学传感器阵列很容易与无线传感模块集成在一起，并通过智能手机读数演示了多种阴离子的实时传感。

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