[23p-C301-1~9] 3.6 Laser processing (formerly 3.7)

[23p-C301-5] Observation of phenomenon of cobalt precipitation from glyoxylic acid cobalt complex ink induced by femtosecond laser pulses

〇Kazuki Yamamoto¹, Tomoji Ohishi², Mizue Mizoshiri¹ (1.Nagaoka Univ. of Tech., 2.Shibaura Inst. of Tech.)

Keywords:Glyoxylic acid metal complexes, Femtosecond laser direct writing, Cobalt precipitation

We investigated the characteristics of cobalt precipitation from glyoxylic acid cobalt complex ink induced by femtosecond laser pulses to reduce the thermal diffusion. X-ray diffraction spectrum of the patterns fabricated at writing speed of 8 mm/s exhibited Co-rich patterns without significant oxidation, although the patterns fabricated at writing speed of 1 mm/s composed of CoO. The time-dependence of the precipitation was investigated using a pump-probe technique. The transmittance of the ink film irradiated at writing speed of 8 mm/s was not changed in the range of 0 to 550 ps, indicating that the Co was precipitated after 550 ps.