Poly-(fluoro isopropyl butyl methacrylate)/graphene-based sensitive oxygen nanocomposite: Electrical measurements and chemical interaction in variable pressure

Abstract

An innovative pressure sensitive nanocomposite based on reduced graphene oxide and pressure sensitive paints was created to facilitate the application and ensure uniform coverage on complex surfaces. Three nanocomposite compositions of 4 mg/mL, 8 mg/mL and 12 mg/mL were produced by ultrasonication. Morphological and structural analyses of the material were carried out by Scanning electron microscope (SEM-FEG), Fourier-transform infrared spectroscopy (FT-IR) and x-ray photoelectron spectroscopy (XPS). Conductivity and sensitivity measurements were investigated for impedance. SEM-FEG results show that rGO interacts with titanium dioxide (TiO2). This interacting is different for each concentration and interferes in the sensitivity to pressure. An FT-IR test indicated a possible mechanism of this sensitivity: induction and resonance interactions between polymer and rGO. It is influenced by oxygen binding with metalloporphyrin molecules. Results of XPS confirm the chemical interaction by FT-IR and migration of TiO2 by SEM. XPS measurement also indicates interactions between metalloporphyrin and rGO This generated an increase in active platinum sites. The carbon reinforcement generates an increase in conductivity, and it was important to realize the sensibility of nanocomposites. Composition of 12 mg/mL presented the highest conductivity and sensitivity.