Investigation On The Synthesis Of Amino Acid Functionalized Aqueous Silver Nanoparticles And Their Properties

Silver nanoparticles have unique properties for their small size effect, surface effect and quantum size effect, etc. They have been widely used in catalyst, biomarker, antibacterial materials and printed electronics. As silver nanoparticles were used more and more widely, there has been an increased emphasis on the “green” synthesis of water dispersible silver nanoparticles. Besides, investigations on the interactions between the protective agents and silver nanoparticles are of great importance on the dispersibility, dispersion stability and application performance of silver nanoparticles. This work mainly focus on the green synthesis of silver nanoparticles, the interactions between the protective agents and silver nanoparticles, and their application in printed electronics.The green synthesis of silver nanoparticles using L-arginine as protective and reductive agent has been investigated with-silver nitrate and silver acetate as silver precursors-by a facile and environmentally benign “single-step one-pot approach”. The two different silver nanoparticles synthesized from silver nitrate and silver acetate were named AgNP-1 and AgNP-2, respectively. The optimum synthesis conditions are as follows: the reaction performed at 60 ? for 1h with a molar ratio L-arginine/silver precursor of 1.5:1. AgNP-1 and AgNP-2 have similar morphology and size distribution, and both are water dispersible and ultra-stable in air and the dispersion.TGA, FT-IR and XPS were used to characterize the surface properties of silver nanoparticles-the capped amount of L-arginine and the bonding types between silver nanocrystal and L-arginine. The results show that the capped amount of L-arginine and the bonding intense of AgNP-1 are both higher than AgNP-2. Finally, stable aqueous nanosilver dispersions with the silver nanoparticle concentration of 10wt% were produced to fabricate patterns by blade coating. The resistivity of nanosilver films sintered at 170? for 60 minutes is 3.8 ??.cm and its adhesion can reach 4A, which facilitate their application in printed electronics.