Question

Bio-functionalization of magnetic nanoparticles has been extensively used for the development of biosensors such as:

• A. Fe₃O₄
• B. ZnO
• C. C₅O₂H₈
• D. GaAs

Hint:

Magnetic nanoparticles like Fe₃O₄ are widely used in biosensors due to their strong magnetic properties and functionalization potential.

Answer 1

The Correct Option is A

Fe₃O₄ (magnetite) nanoparticles are widely used in biosensors due to their magnetic properties. These nanoparticles can be manipulated by an external magnetic field, making them ideal for various biomedical applications such as targeted drug delivery and diagnostic imaging.
Final Answer: \[ \boxed{\text{(1) Fe₃O₄}} \]