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

Magnetite (Fe₃O₄) nanoparticles are frequently employed in biosensors because of their magnetic characteristics. Their susceptibility to manipulation via external magnetic fields renders them suitable for biomedical uses, including targeted drug administration and diagnostic imaging.
Final Answer: \[ \boxed{\text{(1) Fe₃O₄}} \]