Synthesis and Characterization of Polypyrrole/TiO2 Hybrid Composite: Structural and Electrical Insights

In this study, the effect of titanium dioxide (TiO2–H100) on the electrical properties of polypyrrole (Ppy), a conductive polymer known for its promising application in various fields, is investigated. Pure Ppy is synthesized via chemical oxidative polymerization method, and a Ppy/TiO2–H100 composite is prepared with 10% TiO2–H100 by weight. The samples are characterized using Fourier Transform InfraRed spectroscopy (FTIR), X-ray Diffraction (XRD), Thermogravimetric analysis (TGA), and Scanning Electron Microscopy (SEM). The key finding is a significant structural change in Ppy upon the incorporation of TiO2–H100, as confirmed by XRD and SEM, which reveal enhanced crystallinity and a more compact morphology in composite. Regarding the electrical properties, conductivity measurements revealed that the electrical conductivity of pure Ppy at 300 K was 4.81 × 10–7 S/cm, whereas the Ppy/TiO2–H100 composite exhibited a higher conductivity of 5.08 × 10–7 S/cm, likely due to the interfacial interaction between TiO2–H100 and Ppy. Electrochemical impedance spectroscopy (EIS) results showed similar trends, where the composite exhibited semiconductor behavior, reflecting the influence of TiO2–H100 on the electrical properties. These results highlight the potential of TiO2–H100 to modify the electrical and structural properties of Ppy, making it a promising material for semiconductor applications.