A metal nanoparticle having a self-assembled monolayer on a surface thereof, the metal nanoparticle being prepared by forming the self-assembled monolayer including a terminal reactive group A on a surface of a metal nanoparticle, and introducing a functional group being degradable by the action of an acid or a base into the terminal reactive group A,
- wherein the self-assembled monolayer is formed of a compound represented by Formula 1, or formed of a compound represented by Formula 2 followed by introducing the terminal reactive group A into the self-assembled monolayer:
- X—Y-A Formula 1
- wherein X is SH, NC, NH2, COOH, or phosphate;
- Y is a polyvalent C1-C30 organic group;
- and A is selected from the group consisting of OH, COOH, COCl, NH2, NO2, methoxy, ethoxy, and a halogen atom, and
- X—Y′ Formula 2
- wherein X is SH, NC, NH2, COOH, or phosphate;
- and Y′ is a monovalent C1-C30 or a polyvalent C1-C30 organic group.