Next, AgNPs were mixed with a solution composed of p-tert butyltoluene, 2-phenylethan-1-ol and ETHOCEL ® using with a planetary mixing apparatus. After mixing, the AgNPs were dispersed uniformly and then AgInk was obtained as a slightly viscous solution (Figure ). Figure shows a thermogravimetric (TG) profile of AgInk, in which a heating rate set at 20 °C•min -1 under an air flow of 300 mL•min -1 . In the TG profile, weight decreases in two steps. The first decrease in weight around 86 °C (-47.8 wt%) corresponds to vaporization of solvents, and the second decrease around 247 °C (-17.9 wt%) to the thermal decomposition of the ETHOCEL ® and capping molecules. From TG analysis, Ag content of AgInk was determined to be 34.3 wt%. Moreover, differential thermal analysis (DTA) measured along with TG showed exothermic peaks in DTA spectra in the temperature range of around 262-276 °C, indicating the coalescence of AgNPs, which means transformation of AgNPs into metallic Ag occurs in this temperature range.