Ordered mesoporous carbon sphere-based solid-contact ion-selective electrodes
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All-solid-state potassium ion-selective electrodes (K+ ISEs) using ordered mesoporous carbon (OMC) sphere as the solid contact (SC) are fabricated in this work, which exhibit excellent K+-sensing capability including the stable Nernstian response in a wide linear range of 10−4.19–10−0.21 M, a low detection limit of 5.4 μM, short response time, and good stability. The excellent performances of the K+ ISEs are attributable to the OMC spheres with interconnected mesopore structure, uniform spherical morphology, high surface area, high conductivity, and high capacitance, which provide the highly efficient ion-to-electron transduction between the ion-selective membrane and conductive component in the electrodes. More importantly, the OMC sphere-based SC layer can be deposited in the flexible ISEs by solution processing, which thus enables the construction of ion-sensitive field-effect transistor-based handheld K+-sensing system with high sensitivity and reproducibility, demonstrating the potentials of the OMC spheres in practical ion detection devices.
This work was financially supported by Shanghai Committee of Science and Technology (16JC1400703) and National Natural Science Foundation of China (61575121, 51772189, 21772120, and 21572132). We also thank the Instrumental Analysis Center of Shanghai Jiao Tong University, Advanced Electronics Materials and Devices (AEMD) of Shanghai Jiao Tong University for the characterization of materials.
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Conflicts of interest
The authors declare no competing financial interest.
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