Calibration-free Solid-State Ion-Selective Electrode Based on a Polarized PEDOT/PEDOT-S-Doped Copolymer as Back Contact.
Calibration-free Solid-State Ion-Selective Electrode Based on a Polarized PEDOT/PEDOT-S-Doped Copolymer as Back Contact.
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DOI：
10.1021/acs.analchem.2c00748
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发表时间：
2022-06-14
影响因子：
7.4
通讯作者：
Koley, Dipankar
中科院分区：
文献类型：
--
作者：
Bahro, Christopher;Goswami, Subir;Gernhart, Sarah;Koley, Dipankar
固体接触离子选择电极(ISE)除了保持离子载体电极的高选择性和灵敏度外，还具有小型化的固有优势。ISES的主要缺点是每次运行实验前都需要执行一条校准曲线(改变线性校准曲线方程中的截距)，这限制了它们作为一次性传感器或用于远程水样分析的应用。为了克服这些挑战，我们设计了一种独特的由3，4-乙二氧基噻吩乙二醇盐(EDOT)和4-(2，3-dihydrothieno[3，4-b][1，4]dioxin-2-ylmethoxy)-1-butanesulfonic酸钠盐(EDOT-S)制成的背触点。未经校正的离子选择电极对主要干扰离子的选择性接近能斯特响应，分别为57.2±0.2 mV/log[K+]和28.5±0.3 mV/log[Ca~(2+)]。钙离子和钾离子的检出限分别为0.45±0.0 1和1.6 8±0.18μM。PEDOT：PEDOT-S背触点的充电循环使我们能够将背景电位固定在不同离子载体(K+，Ca~(2+))上所需的固定截取值。该方法用于测定小溪水样中K+和Ca~(2+)的含量。当地一条小溪的[Ca~(2+)]和[K~+]的活度和浓度分别为2 5 7±7 3和2 8 1±1 1μM。
Solid-contact ion-selective electrodes (ISEs) have the inherent advantage of being miniaturized in addition to maintaining high selectivity and sensitivity of the ionophore-based ISE. The major disadvantage of ISEs is the necessity of performing a calibration curve (varying the intercept in the linear calibration curve equation) each time before running experiments, which limits their application as one-time disposable sensors or for use in remote water sample analysis. To overcome these challenges, we designed a unique back contact made of 3,4-ethylenedioxythiophene (EDOT) and 4-(2,3-dihydrothieno[3,4-b][1,4]dioxin-2-ylmethoxy)-1-butanesulfonic acid, sodium salt (EDOT-S). The calibration-free ISEs showed near Nernstian responses of 57.2 ± 0.2 mV/log [K+] and 28.5 ± 0.3 mV/log [Ca2+], while maintaining their respective selectivity against major interfering ions. The detection limits for Ca2+ and K+ ISEs were 0.45 ± 0.01 and 1.68 ± 0.18 μM, respectively. The charging cycles of the PEDOT: PEDOT-S back contact allowed us to fix the background potential at a desired fixed intercept value across different ionophores (K+, Ca2+). This protocol was used to determine the K+ and Ca2+ contents in creek water samples. The activity and concentration of [Ca2+] and [K+] in a local creek was found to be 257 ± 7.3 and 28.1 ± 1.1 μM, respectively.
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