Water enabled self-healing polymeric coating with reduced graphene oxide-reinforcement for sensors
Kally C.S. Ly (University of Campinas)
Mawin J.M. Jimenez (University of Campinas)
Silvia Cucatti (University of Campinas)
Diogo Volpati (Lund University)
Marcelo A. Pereira-da-Silva (Instituto de Física de São Carlos, São Carlos, Centro Universitário Central Paulista)
Flavio M. Shimizu (University of Campinas)
Tiago P. Almeida (TU Delft - BT/Biocatalysis, University of Campinas)
Varlei Rodrigues (University of Campinas)
Jose Alberto F. da Silva (University of Campinas)
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Abstract
Intrinsic self-healing materials have received significant attention due to the characteristic recovery after damage properties through reversible dynamic covalent and non-covalent interactions. Furthermore, functional recovery with reliable mechanical properties are highly keen as protective coatings, specifically for devices and sensors vulnerable to abrasion in severe environments. Here, we present a functional hierarchical nanostructure capable of multiple micro-sized healings, with enhanced mechanical hardness due to the incorporation of graphene oxide (rGO) nanoplatelets. A self-healing multilayered nanocomposite formed by poly(ethylene imine) (PEI) and poly(acrylic acid) (PAA) was easily assembled by the layer-by-layer (LbL) technique. The addition of the rGO nanoplatelets in the LbL nanostructure resulted in a 13-fold increase in hardness (0.4 ± 0.1 GPa) when compared to the (PEI/PAA) architecture (0.03 ± 0.01 GPa). In addition, the nanocomposite presents an enhanced insulating electrical behavior (∼ 4.10−8 S/cm) despite the addition of the rGO nanoplatelets. Raman and Zeta Potential analysis indicated a possible wrapping of the rGOs by PEI, justifying the observed insulating electrical characteristics. The nanocomposite presents good hydrophobicity with a water contact angle of 136°, interesting to extend the lifetime and protect underlying layers from humidity, degradation, and encrustation. Therefore, we propose an attractive hydrophobic, electrically insulating, and mechanically resistant multifunctional coating for high-performance electronic interfaces from minor cuts and abrasions, dispensing maintainer intervention.
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