Method for manufacturing conductive metal thin film using carboxylic acid

A method for manufacturing a conductive metal thin film, comprising:

• preparing a conductive metal coating solution by adding carboxylic acid to a dispersion including a conductive metal nanoparticle with a natural oxide layer formed on the surface and therefore having a core/shell structure, and uniformly mixing the solution using sonication and planetary milling;
• coating the conductive metal coating solution on a top portion of a substrate, heat-treating it in a vacuum at 150 to 300° C. and removing the natural oxide layer on the surface of the conductive metal nanoparticle having the core/shell structure
• to form a thin film of the conductive metal nanoparticle from which the natural metal oxide layer is removed,
• wherein the dispersion including the conductive metal nanoparticle having the core/shell structure comprises (a) 5 to 40 wt % of conductive metal nanoparticle;
• (b) 50 to 90 wt % of organic solvent comprising ethylene glycol and methyl alcohol;
• and (c) 1 to 10 wt % of one or more dispersant selected from the group consisting of dibutyl sebacate (DBS), sodium dodecyl sulfate (SDS), sodium bis (2-ethylhexyl) sulfosuccinate (AOT), cetyltrimethylammonium bromide (CTAB), triton X-100, tween 20, poly (acrylic acid) (PAA), poly styrene-alt-maleic acid (PSM), and poly (styrene-co-acrylic acid) (PSA).