Question

Which of the following statements is incorrect about Light-addressable potentiometric sensors (LAPS)?

• A. In the LAPS with EIS structure, a semiconductor substrate (silicon) is covered with an insulator (SiO2).
• B. An enzyme deposited on the LAPS surface allows one to observe the spatial distribution of a specific substrate.
• C. In the LAPS with electrolyte-insulator-semiconductor (EIS) structure, a semiconductor substrate (silicon) is covered with an insulator (SiO2).
• D. A sensing ion-selective layer, for instance, pH-sensitive S3N4, is deposited on the bottom of the insulator.

Hint:

LAPS sensors work based on ion-selective layers and do not rely on enzymatic processes for spatial distribution analysis.

Answer 1

The Correct Option is B

Step 1: LAPS Structure Explained.
The LAPS with EIS configuration consists of a semiconductor substrate coated with an insulating layer (SiO2), upon which a sensing layer is deposited.

Step 2: Enzyme Usage in LAPS.
The assertion that LAPS utilizes enzymes to visualize substrate spatial distribution is false and an inaccurate description of LAPS functionality.

Final Answer: \[\boxed{\text{(2)}}\]