Abstract

We have already reported that multi-photon excitation of tris(2,2′-bipyridyl)ruthenium complex [Ru(bpy)₃²⁺] by femtosecond pulse laser with near infrared wavelength as the light sources, the 3D printing system of conductive polymers. [1-3] The proposed printing system enabled to form 2D and 3D patterns with fine process resolution. In the reaction system, spatially localized oxidation power was generated by two-photon absorption of Ru(bpy)₃²⁺ as the sensitizer and the successive photo-induced electron transfer between the exited state of the Ru(bpy)₃²⁺ and methylviologen [MV²⁺] as the electron acceptor. This 3D printing system has already achieved the sub-micron process resolution which was better than the diffraction limit (864 nm) for the employed optical system. [4] As the result in the electric conductivity evaluation of the obtained 3D PPy micro-structures by a two-probe method, relatively higher values of a few hundred Scm⁻¹ were obtained at the full doped state. Influences of the illumination conditions on the electric conductivity of the obtained PPy depositions were studied in this work.

© 2016 Japan Society of Applied Physics, Optical Society of America