Recent advances in nanomaterial-based solid-contact ion-selective electrodes

Mirabootalebi, Seyed Oveis; Liu, Yang

doi:10.1039/d4an00334a

Analyst

2024

DOI: 10.1039/d4an00334a

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Recent advances in nanomaterial-based solid-contact ion-selective electrodes

Seyed Oveis Mirabootalebi,

Yang Liu

Abstract: Solid-contact ion-selective electrodes (SC-ISEs) are advanced potentiometric sensors with high capability to detect a wide range of ions for monitoring of industrial processes and environmental pollutants, as well as determination...

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2024

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Cited by 4 publications

References 226 publications

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Classification techniques of ion selective electrode arrays in agriculture: a review

Zhai,

Duan,

Luo

et al. 2024

Anal. Methods

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Classification techniques of ion selective electrode arrays in agriculture: a review

Zhai,

Duan,

Luo

et al. 2024

Anal. Methods

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Multi-Walled Carbon Nanotubes and Copper Oxide Nanoparticles Composite Used as Transducer Medias in Nitrate Ion-Selective Electrodes

Morawska,

Malinowski,

Krawczyk

et al. 2024

J. Electrochem. Soc.

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To improve the performance of nitrate solid contact ion-selective electrodes, their design was modified with a composite material consisting of multi-walled carbon nanotubes and copper oxide nanoparticles. The nanocomposite was used in the electrodes as a component of the ion-sensitive membrane (GCE/NC+ISM) and as a solid contact material applied by drop casting (GCE/NC/ISM). A series of comparative studies were conducted to determine which type of modification more favorably affected the performance of each electrode. A classical glassy carbon electrode with a membrane without a nanocomposite was used as a control electrode. The best electrode turned out to be the one in which transducer media in the form of a composite was implemented into the membrane. For the GCE/NC+ISM electrode, the highest sensitivity of 60.41 mV/decade, the lowest detection limit of 8.52×10-7 M, and the widest linearity range of 1×10-6 – 1×10-1 M were obtained. The presence of the nanocomposite in the membrane contributed to a significant improvement in electrical performance relative to the unmodified electrode, which in turn resulted in obtaining good potential reversibility and low potential drift – 0.085 µV/s. The prepared electrode was used to determine the concentration of nitrates in environmental water samples.

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A Highly Stable Electrochemical Sensor Based on a Metal–Organic Framework/Reduced Graphene Oxide Composite for Monitoring the Ammonium in Sweat

Hua,

Mai,

et al. 2024

Biosensors

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The demand for non-invasive, real-time health monitoring has driven advancements in wearable sensors for tracking biomarkers in sweat. Ammonium ions (NH4+) in sweat serve as indicators of metabolic function, muscle fatigue, and kidney health. Although current ion-selective all-solid-state printed sensors based on nanocomposites typically exhibit good sensitivity (~50 mV/log [NH4+]), low detection limits (LOD ranging from 10−6 to 10−7 M), and wide linearity ranges (from 10−5 to 10−1 M), few have reported the stability test results necessary for their integration into commercial products for future practical applications. This study presents a highly stable, wearable electrochemical sensor based on a composite of metal–organic frameworks (MOFs) and reduced graphene oxide (rGO) for monitoring NH4+ in sweat. The synergistic properties of Ni-based MOFs and rGO enhance the sensor’s electrochemical performance by improving charge transfer rates and expanding the electroactive surface area. The MOF/rGO sensor demonstrates high sensitivity, with a Nernstian response of 59.2 ± 1.5 mV/log [NH4+], an LOD of 10−6.37 M, and a linearity range of 10−6 to 10−1 M. Additionally, the hydrophobic nature of the MOF/rGO composite prevents water layer formation at the sensing interface, thereby enhancing long-term stability, while its high double-layer capacitance minimizes potential drift (7.2 µV/s (i = ±1 nA)) in short-term measurements. Extensive testing verified the sensor’s exceptional stability, maintaining consistent performance and stable responses across varying NH4+ concentrations over 7 days under ambient conditions. On-body tests further confirmed the sensor’s suitability for the continuous monitoring of NH4+ levels during physical activities. Further investigations are required to fully elucidate the impact of interference from other sweat components (such as K+, Na+, Ca2+, etc.) and the influence of environmental factors (including the subject’s physical activity, posture, etc.). With a clearer understanding of these factors, the sensor has the potential to emerge as a promising tool for wearable health monitoring applications.

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Recent advances in nanomaterial-based solid-contact ion-selective electrodes

Abstract: Solid-contact ion-selective electrodes (SC-ISEs) are advanced potentiometric sensors with high capability to detect a wide range of ions for monitoring of industrial processes and environmental pollutants, as well as determination...

Cited by 4 publications

References 226 publications

Classification techniques of ion selective electrode arrays in agriculture: a review

Classification techniques of ion selective electrode arrays in agriculture: a review

Multi-Walled Carbon Nanotubes and Copper Oxide Nanoparticles Composite Used as Transducer Medias in Nitrate Ion-Selective Electrodes

A Highly Stable Electrochemical Sensor Based on a Metal–Organic Framework/Reduced Graphene Oxide Composite for Monitoring the Ammonium in Sweat

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