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<p>Magnetic polymer nanocomposites comprising polyaniline (PANI) and Co-doped TiO<sub>2</sub> nanoparticles were created via in situ oxidative polymerization utilizing Co-doped TiO<sub>2</sub> nanofillers previously produced by the polymer pyrolysis method. The aim was to create lightweight organic–inorganic hybrid materials with adjustable magnetic characteristics for sophisticated functional applications. The produced nanocomposites’ structural, morphological, and magnetic properties were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), and vibrating sample magnetometry (VSM). XRD examination validated the successful integration of Co-doped TiO2 nanofillers into the PANI matrix, indicating nanoscale crystallite sizes between 9.7 and 11.8&#xa0;nm and minor lattice aberrations due to cobalt inclusion. FTIR investigations verified the characteristic vibrational bands of the PANI matrix, demonstrating significant interfacial interactions via a systematic blueshift of the benzenoid C = C stretching band from 1482 to $1494&#xa0;cm<sup>−1</sup> upon increased oxide nanoparticles loading.. HRTEM investigations demonstrated a rather homogeneous distribution of Co-doped TiO<sub>2</sub> nanoparticles inside the polymer matrix, resulting in the creation of cohesive nanocomposite structures. Magnetic studies conducted with a vibrating sample magnetometer revealed that the magnetic properties of the nanocomposites are significantly influenced by the cobalt concentration in the nanofillers. Samples with diminished cobalt content demonstrated a feeble magnetic response, whereas increased cobalt loading led to the emergence of distinct room-temperature ferromagnetic hysteresis loops. The PANI-CT10 nanocomposite demonstrated a saturation magnetization (Ms) of 0.05173 emu g⁻<sup>1</sup>, a remanent magnetization (Mr) of 0.002093 emu g⁻<sup>1</sup>, and a coercive field (Hc) of 251.17 G, while the PANI-CT15 sample exhibited superior magnetic properties with Ms = 0.07962 emu g⁻<sup>1</sup>, Mr = 0.006979 emu g⁻<sup>1</sup>, and Hc = 436.76 G. The improved magnetic properties are ascribed to defect-mediated exchange interactions linked to substitutional Co ions and magnetic coupling related to oxygen vacancies. The findings indicate that regulating cobalt concentration in Co-doped TiO<sub>2</sub> nanofillers effectively tailors the magnetic properties of PANI-based nanocomposites, rendering them suitable for spintronic devices, magnetic sensors, and electromagnetic interference shielding applications.</p>

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Magnetic, structural, and morphological properties of PANI–Co-doped TiO2 nanocomposites synthesized via in situ oxidative polymerization

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Ashraf H. Farha,
  • Amira Ben Gouider Trabelsi,
  • Fatemah H. Alkallas,
  • Adil Alshoaibi,
  • Shehab A. Mansour

摘要

Magnetic polymer nanocomposites comprising polyaniline (PANI) and Co-doped TiO2 nanoparticles were created via in situ oxidative polymerization utilizing Co-doped TiO2 nanofillers previously produced by the polymer pyrolysis method. The aim was to create lightweight organic–inorganic hybrid materials with adjustable magnetic characteristics for sophisticated functional applications. The produced nanocomposites’ structural, morphological, and magnetic properties were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), high-resolution transmission electron microscopy (HRTEM), and vibrating sample magnetometry (VSM). XRD examination validated the successful integration of Co-doped TiO2 nanofillers into the PANI matrix, indicating nanoscale crystallite sizes between 9.7 and 11.8 nm and minor lattice aberrations due to cobalt inclusion. FTIR investigations verified the characteristic vibrational bands of the PANI matrix, demonstrating significant interfacial interactions via a systematic blueshift of the benzenoid C = C stretching band from 1482 to $1494 cm−1 upon increased oxide nanoparticles loading.. HRTEM investigations demonstrated a rather homogeneous distribution of Co-doped TiO2 nanoparticles inside the polymer matrix, resulting in the creation of cohesive nanocomposite structures. Magnetic studies conducted with a vibrating sample magnetometer revealed that the magnetic properties of the nanocomposites are significantly influenced by the cobalt concentration in the nanofillers. Samples with diminished cobalt content demonstrated a feeble magnetic response, whereas increased cobalt loading led to the emergence of distinct room-temperature ferromagnetic hysteresis loops. The PANI-CT10 nanocomposite demonstrated a saturation magnetization (Ms) of 0.05173 emu g⁻1, a remanent magnetization (Mr) of 0.002093 emu g⁻1, and a coercive field (Hc) of 251.17 G, while the PANI-CT15 sample exhibited superior magnetic properties with Ms = 0.07962 emu g⁻1, Mr = 0.006979 emu g⁻1, and Hc = 436.76 G. The improved magnetic properties are ascribed to defect-mediated exchange interactions linked to substitutional Co ions and magnetic coupling related to oxygen vacancies. The findings indicate that regulating cobalt concentration in Co-doped TiO2 nanofillers effectively tailors the magnetic properties of PANI-based nanocomposites, rendering them suitable for spintronic devices, magnetic sensors, and electromagnetic interference shielding applications.