Facile synthesis of low temperature sintering Ag nanopaticles for printed flexible electronics

Silver nanoparticles with small particle size distribution and good dispersibility were synthesized through a facile chemical reduction method. In the progress, AgNO 3 was used as the precursor, polyacrylic acid and ethanol amine were introduced as the protective agent, hydrazine hydrate was chosen as the reduce agent. Diameter of the resulted monodisperse silver nanoparticles is between 50 and 70 nm. Then, the obtained silver nanoparticles were well dispersed in the oil-based ink, which can be printed on a flexible polyimide substrate to form the conductive printed circuit board through following low temperature annealing treatment. A lowest electricity resistivity of 5.6 × 10 −8  Ω m is obtained which is only 3.5× higher than that of bulk silver.