Desenvolvimento de método para obtenção de trilhas condutivas com grafeno por esfoliação em fase líquida aplicadas à eletrônica impressa na Indústria 4.0

Abstract

This study presents the development and characterization of conductive tracks based on graphene obtained via liquid-phase exfoliation (LPE), applied to printed circuit boards (PCBs) on FR4 substrates. Graphene synthesis was carried out by dispersing graphite flakes in a surfactant-assisted solvent, followed by ultrasonic exfoliation for 30 minutes. The resulting material was characterized using XRD, SEM, and Raman spectroscopy, confirming the presence of multilayer graphene with moderate structural defects. Conductive inks were formulated with different proportions of Jutaicica resin, a natural Amazonian binder, achieving good adhesion to the substrate. Tests indicated average track thickness of ~72 µm and electrical conductivity of 0.75 and 0.91 (Ω.cm)-¹ for inks 1 and 2, respectively. The findings demonstrate the potential of LPE graphene combined with Amazonian biodiversity inputs for the formulation of functional and sustainable conductive inks, aligned with sustainability principles and Industry 4.0.