Tintas Condutoras á base de Estruturas Bidimensionais de Carbono

Abstract

The present study focuses on the development and electrical characterization of conductive inks based on two-dimensional carbon structures, targeting applications in functional printed electronics devices. Given the cost and stability limitations of commercial noble-metal-based inks and the susceptibility to oxidation of metals like copper, this research explores carbonaceous materials as viable and low-cost alternatives. The general objective was to develop and characterize formulations optimized for application on both flexible and rigid substrates, focusing on adhesion, conductivity, and thermal stability. Three distinct formulations were prepared, utilizing compatible solvent/binder systems (acetone/nail base and deionized water/Poly(vinyl alcohol) - PVA), and deposited via the blade coating technique. The electrical characterization of the films was performed using the four-point collinear probe method, which eliminates the interference of contact resistance and allows for the accurate determination of sheet resistance (Rs). The samples were subjected to controlled thermal treatments to evaluate the impact on conductivity and stability. Furthermore, the analysis of the linearity of the current-voltage (IV) curves was employed to confirm the ohmic behavior of the produced films. The obtained results provided crucial groundwork for improving formulation and thermal treatment routines, contributing to the development of accessible, stable, and reproducible solutions, which are essential for the consolidation of low-cost circuit printing technologies.