a metal nanoparticle colloid solution , metal - polymer nanocomposites , and methods for preparing the same are provided . the metal nanoparticle colloid solution and the metal - polymer nanocomposites can be prepared with a variety of polymeric stabilizers and have uniform particle diameter and shape . the metal nanoparticle colloid solution and the metal - polymer nanocomposites have wide applications , for example , as an antibacterial agent , a sterilizer , a conductive adhesiv , conductive ink or an electromagnetic wave shielder for an image display .