Enhancement of Electrical and Mechanical Properties of SU-8 Photocrosslinked Coatings Containing Polypyrrole-graphene Oxide Nanoparticles

Abstract

In the present study, photo-curing of polypyrrole decorated graphene oxide nanoparticle (PPy-GO) filled SU-8 photoresist and its effect on the electrical and mechanical properties of nanocomposite were investigated at different loading level of PPy-GO. Chemical structure of SU-8 and its nanocomposites before and after UV irradiation have been characterized using infrared spectroscopy. A significant increase of electrical conductivity was observed as a function of filler content in the nanocomposites confirming the conducting nature of the polymeric coating with incorporation of PPy-GOs. The real permittivity was observed to increase with increasing the PPy-GOs nanofiller loading, and the enhanced permittivity was interpreted by the interfacial polarization. The mechanical properties analysis demonstrated that the hardness has increased 2 time and SEM observations indicated well dispersion of PPy-GO nanoparticles within the cured SU-8 resin matrix.