AgNPs were synthesized based on a previously reported method with slight modification, in which Ag precursor complex reacted with reducing reagents and capping molecules at the temperature of which the complex decomposes. In this study, as a precursor complex, Ag(I) octanoate was used for synthesizing AgNPs with a uniform diameter, resulting the transformation of AgNPs to metallic Ag can occur at the narrow range of sintering temperature. As shown in Figure , Ag(I) octanoate was mixed with octadecylamine as reducing reagent and tetradecanoic acid as capping molecules in 1-octadecene and reacted at 180 °C for 2h. After purification by decantation with isopropanol followed by dry at ambient temperature, AgNPs were obtained with a multi-gram scale as shown in Figure . The AgNPs were could be dispersed in various non-polar organic solvents such as hexane and toluene. Figure shows a transmission electron microscopy (TEM) image of AgNPs. From TEM observations, the diameter of the AgNPs were found to be almost uniform (average diameter is 8.7 nm, size deviation is 8.6 % as counts of 100 NPs).