Miniature Ion‐selective Electrodes with Mesoporous Carbon Black as Solid Contact
Miniature Ion‐selective Electrodes with Mesoporous Carbon Black as Solid Contact
复制标题
以介孔炭黑作为固体触点的微型离子选择性电极
DOI:
10.1002/elan.202100088
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发表时间:
2021
期刊:
影响因子:
3
通讯作者:
Papautsky, Ian
中科院分区:
文献类型:
--
作者:
Zhang, Zhehao;Papautsky, Ian
Herein, we demonstrated miniature solid‐contact ion‐selective electrodes (ISEs) using a commercial mesoporous carbon black (MCB) as ion‐to‐electron transducer. MCB is attractive in its high surface area, good conductivity, relative low cost and availability. ISEs for potassium (K+) and nitrate (NO3−) ions were prepared by subsequently coating the sealed glass capillaries (1.5 mm) with MCB and ion‐selective membranes. Addition of MCB substantially stabilized electrode response by providing adequate double‐layer capacitance and lowering resistance by more than 100× compared to the coated‐wire electrodes. The electrodes exhibited near‐Nernstian slopes of 59.6 (K+ionophore), 57.8 (K+ion‐exchanger) and −54.8 (NO3−ion‐exchanger) with standard solutions in the range of 10−5to 10−1M. Fast response (∼10 s) and reproducible sensitivities were also obtained in a mixed electrolyte containing interfering ions, although with a baseline drift of 2–10 mV/day in the long term. Importantly, the electrodes can be simply stored in air between measurements and used directly without conditioning in solutions. With simple fabrication and free maintenance, these sensors offer a low cost and convenient alternative to bulk ISEs, especially when sample volumes or space are limited.
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