Electrical and Electrochemical Biosensors Quiz

Impedimetric biosensors use a three-electrode measurement system.

Electrical impedance (EI) measurement requires a front-end potentiostat.

Electrochemical impedance (ECI) involves using a pair of electrodes: working electrode (WE) and counter electrode (CE).

The reference electrode (RE) in electrochemical impedance contributes the full-cell potential.

The schematic setup for the measurement of EI and ECI is shown on the left in the text.

Interdigitated microsensor electrode array is commonly used in electrical biosensors.

Impedance spectroscopy is a technique that can be used to extract information from EIS measurements.

The X-axis of a Nyquist plot represents the imaginary part in EIS measurements.

Each point on a Nyquist plot corresponds to impedance at multiple frequencies.

The semicircle in an RC circuital model indicates multiple time constants.

The capacitor in an RC circuital model represents the charge transfer resistance.

Electrical biosensors focus on detecting electrical signals from cells and tissues.

Impedimetric biosensors are only used for detecting antibodies in the blood circulation.

Interdigitated microsensor electrode arrays are fabricated using lithographic techniques.

Microlithographically fabricated electrodes are typically less sensitive than electrodes made using other methods.

Electrical biosensors rely on impedance changes for detection.

Electrochemical biosensors primarily use optical signals for detection purposes.

Impedimetric biosensors work by measuring the resistance of a material to an electrical current.