Copper conductive film was synthesized at low temperature onto a glass substrate by thermal decomposition of complexes of copper (II) formate and n-octyl amine in nitrogen atmosphere. The film generated by calcination above 110 degrees C indicated electrical conductivities, resulting in the lowest resistivity of 2 x 10(-5) Omega cm by calcination at 140 degrees C. The copper conductive film consisted of spherical copper nanoparticles that were a mixture of large and small particles, which resulted in low volume resistivity. (C) 2011 Elsevier B.V. All rights reserved.