The novel behavior of real and imaginary part of impedance, modulus, and AC conductivity of Au/PPy–MWCNTs/TiO2/Al2O3/n-Si/Al

The article delves into the innovative electrical and dielectric properties of a composite structure composed of polypyrrole, multiwall carbon nanotubes, and oxides on a silicon substrate. The research focuses on the unique behavior of the real and imaginary parts of impedance, modulus, and AC conductivity across various frequencies and temperatures. The study reveals that the imaginary part of impedance exhibits positive and negative values at different frequencies, while the real part shows a similar pattern. The Cole–Cole diagram further illustrates these behaviors at different voltages and temperatures. The real and imaginary parts of the modulus also display distinct patterns across frequency ranges, with peaks indicating relaxation processes. The AC conductivity exhibits positive values at low frequencies and negative values at mid and high frequencies, with notable peaks. The I–V measurements demonstrate a reasonable rectification performance and suggest the formation of a heterojunction at the interfaces. The study concludes with the synthesis and exploration of this novel composite structure, highlighting its unique electrical and dielectric properties.