Novel Room Temperature Wiring Process of Ag Nanoparticle Paste

Ag nanoparticles protected by dodecylamine were formed into paste and successfully sintered at room temperature in air atmosphere. In order to remove the dodecylamine dispersant, Ag nanoparticles printed as lines on glass substrates were dipped in methanol for 10 s to 7200 s. As a result, the sintered wires possess excellent low resistivity, 7.3times10^-7 Omegam after 7200 s dipping. From in-situ electrical resistance measurement, the electrical resistance of Ag nanoparticles becomes smaller as sintering time increases. Microstructural observation on room temperature sintering revealed that, as dipping time increases, Ag nanoparticles agglomerate to be coarsened, and connection among particles becomes clearer. Thus, a novel room temperature wiring method for Ag nanoparticles has been successfully developed in air atmosphere.