Structure–Property Relationships in PVDF/SrTiO3/CNT Nanocomposites for Optoelectronic and Solar Cell Applications

The optical properties of polyvinylidene fluoride (PVDF) polymer nanocomposite films
incorporating SrTiO3/carbon nanotubes (CNTs) as nanofillers are investigated. PVDF/SrTiO3/CNTs
films were prepared by the solution casting technique. X-ray diffraction (XRD), Fourier-transform
infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) analyses confirmed the incorporation
of SrTiO3/CNTs into the PVDF matrix. The addition of nanofillers influenced the crystalline
structure, morphology, and optical properties of the films. SEM images showed spherulite morphology,
which is a spherical aggregate of crystalline polymer chains. The addition of a SrTiO3/CNTs
nanofiller modified the polymer’s electronic structure, causing a variation in the energy gap. The
addition of SrTiO3/CNTs at 0.1 wt% increased the band gap, refractive index, and nonlinear optical
properties of the PVDF films. These improvements indicate the potential of these nanocomposite films
in optoelectronic applications such as solar cells, image sensors, and organic light-emitting diodes