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<p>In this study, sodium alginate (NaAlg) polymer doped with molybdenum disulfide (MoS<sub>2</sub>) were prepared using the solution casting method. FTIR analysis revealed strong interactions between NaAlg and MoS<sub>2</sub> nanoparticle, evidenced by the complexation of O–H and –COO⁻ functional groups, indicating hydrogen bonding and electrostatic interactions between nanofiller and the polymer host. The observed shifts and intensity variations in the characteristic peaks of the pristine polymer upon doping further confirm the successful incorporation of MoS₂ into the alginate matrix. X-ray diffraction (XRD) studies demonstrated a transformation from the predominantly amorphous nature of pure NaAlg to enhanced crystallinity in the polymer nanocomposites, with sharper diffraction peaks appearing as the MoS₂ concentration increased. UV-visible spectroscopy revealed a shift in absorption band towards higher wavelength and a reduction in the optical band gap from 4.9 to 4.3&#xa0;eV with increasing nanoparticle content. Thermogravimetric analysis (TGA) confirmed improved thermal stability of the nanocomposites, indicating the role of MoS<sub>2</sub> in retarding thermal degradation. Surface morphology studies showed a smooth and porous structure for pure NaAlg, while increased surface roughness was observed with higher MoS₂ loading. Dielectric investigations revealed enhanced dielectric parameters with increasing MoS<sub>2</sub> concentration, with the maximum dielectric performance observed for the 1wt% MoS<sub>2</sub> incorporated polymer nanocomposite. The same composition also exhibited the highest dc conductivity of 3.33 × 10<sup>− 4</sup> Scm<sup>− 1</sup> for the 1wt% MoS<sub>2</sub> incorporated polymer nanocomposite.</p>

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Study of structural, optical, morphological, dielectric and electrical properties of MoS2 doped NaAlg polymer nanocomposites

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • R. Sahanakumari,
  • V. Ravindrachary,
  • R. Padmakumari,
  • Rohan N. Sagar,
  • M. Thirumala Patil,
  • B. K. Mahantesha,
  • Shreedatta Hegde

摘要

In this study, sodium alginate (NaAlg) polymer doped with molybdenum disulfide (MoS2) were prepared using the solution casting method. FTIR analysis revealed strong interactions between NaAlg and MoS2 nanoparticle, evidenced by the complexation of O–H and –COO⁻ functional groups, indicating hydrogen bonding and electrostatic interactions between nanofiller and the polymer host. The observed shifts and intensity variations in the characteristic peaks of the pristine polymer upon doping further confirm the successful incorporation of MoS₂ into the alginate matrix. X-ray diffraction (XRD) studies demonstrated a transformation from the predominantly amorphous nature of pure NaAlg to enhanced crystallinity in the polymer nanocomposites, with sharper diffraction peaks appearing as the MoS₂ concentration increased. UV-visible spectroscopy revealed a shift in absorption band towards higher wavelength and a reduction in the optical band gap from 4.9 to 4.3 eV with increasing nanoparticle content. Thermogravimetric analysis (TGA) confirmed improved thermal stability of the nanocomposites, indicating the role of MoS2 in retarding thermal degradation. Surface morphology studies showed a smooth and porous structure for pure NaAlg, while increased surface roughness was observed with higher MoS₂ loading. Dielectric investigations revealed enhanced dielectric parameters with increasing MoS2 concentration, with the maximum dielectric performance observed for the 1wt% MoS2 incorporated polymer nanocomposite. The same composition also exhibited the highest dc conductivity of 3.33 × 10− 4 Scm− 1 for the 1wt% MoS2 incorporated polymer nanocomposite.