Capacitive model of enzyme-modified field-effect biosensors: Impact of enzyme coverage

Karschuck, Tobias; Poghossian, Arshak; Ser, Joey; Tsokolakyan, Astghik; Achtsnicht, Stefan; Wagner, Patrick; Schöning, Michael J.

doi:10.1016/j.snb.2024.135530

Sensors and Actuators B: Chemical

2024

DOI: 10.1016/j.snb.2024.135530

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Capacitive model of enzyme-modified field-effect biosensors: Impact of enzyme coverage

Tobias Karschuck,

Arshak Poghossian,

Joey Ser

et al.

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2024

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Cited by 2 publications

References 68 publications

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Optimization of electrolyte‐insulator‐semiconductor capacitor sensor by differential design

Luo,

Liu,

Chen

et al. 2024

Electroanalysis

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An electrolyte‐insulator‐semiconductor capacitor (EISCAP) sensor with the unique differential design is proposed where a liquid‐free reference (LR) device is used as the reference signal source. After the output matching based on AC excitation adjustment, LR device can provide up to 80% elimination efficiency of background signal for differential EISCAP sensor. Experiment results of pH sensing demonstrate that the differential EISCAP sensor has the better accuracy and time stability compared with conventional EISCAP sensor. The differential design provides a feasible optimization direction for EISCAP sensor in monitoring applications.

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Optimization of electrolyte‐insulator‐semiconductor capacitor sensor by differential design

Luo,

Liu,

Chen

et al. 2024

Electroanalysis

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Rapid‐Response and Portable Lead Ion Sensor Using Co/Pt/Si Schottky Heterojunction Without Reference Electrode

Tan,

Hui,

et al. 2024

Electroanalysis

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Lead ions (Pb 2+) are classified as highly toxic heavy metals that pose substantial threats to both human health and environmental integrity. Consequently, the sensitive detection of Pb 2+, particularly at low concentrations, is imperative for the purposes of environmental surveillance and safeguarding public health. Here, we introduce a Co/Pt/Si Schottky heterostructure for a rapid, portable Pb 2+ detection sensor. One electrode of the heterojunction serves as a Pb 2+ probe, and sensor processing circuits are integrated. The Co/Pt thin films were deposited via magnetron sputtering on a Si(100) substrate, followed by heterojunction fabrication using semiconductor process technology. The sensor is functionalized with a glutathione‐modified gold electrode, leveraging the sulfur‐donor properties of cysteine in glutathione and the electron‐acceptor behavior of Pb 2+ ions. This interaction modulates the gold electrode's surface potential, altering the current‐voltage rectification of the Co/Pt/Si heterojunction. A two‐terminal configuration enables current signal readout without reference electrodes. The sensor demonstrates a linear response to Pb 2+ concentrations ranging from 1 × 10 ‐8 to 1 × 10 ‐3 mol/L, with high selectivity attributed to the affinity of glutathione for Pb 2+. Its key benefits are the simplicity of its fabrication process and its portability, which are enhanced by the integration of measurement circuitry. This makes the sensor a promising candidate for rapid, on‐site detection of heavy metal ions in applications related to health and environmental monitoring.

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Capacitive model of enzyme-modified field-effect biosensors: Impact of enzyme coverage

Cited by 2 publications

References 68 publications

Optimization of electrolyte‐insulator‐semiconductor capacitor sensor by differential design

Optimization of electrolyte‐insulator‐semiconductor capacitor sensor by differential design

Rapid‐Response and Portable Lead Ion Sensor Using Co/Pt/Si Schottky Heterojunction Without Reference Electrode

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