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: Understanding the LAPS structure.
The LAPS with EIS structure involves a semiconductor covered with an insulator layer (SiO2), and a sensing layer is deposited on the insulator.

Step 2: Enzyme in LAPS.
LAPS does not use enzymes for observing spatial distribution of substrates. This part of the statement is incorrect, as it misrepresents the functionality of LAPS.

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