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<p>This study reports the synthesis and characterization of chitosan/polyaniline (PANI)/MoO<sub>3</sub> hybrid nanocomposites prepared via oxidative polymerization using ammonium persulfate as the oxidizing agent. The structural and morphological properties were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM), confirming successful nanocomposite formation and the effective incorporation of MoO<sub>3</sub> within the polymer matrix. Thermal analysis revealed improved thermal stability upon MoO<sub>3</sub> incorporation. The chitosan/PANI/MoO<sub>3</sub> (0.6&#xa0;g) nanocomposite exhibited a higher residual weight (52.29%) and lower total weight loss (48%) than the chitosan/PANI matrix (42.44% residual weight and 58% weight loss) at 600&#xa0;°C. Furthermore, the decomposition temperature increased by approximately 147&#xa0;°C, indicating enhanced thermal resistance. DSC analysis further confirmed the delayed thermal degradation of the nanocomposite. Optical studies using diffuse reflectance spectroscopy revealed a reduction in the optical band gap with increasing MoO<sub>3</sub> content. The optical band gap decreased from 2.74 to 2.63&#xa0;eV with increasing MoO<sub>3</sub> loading, suggesting enhanced electronic delocalization and modification of the electronic structure of the nanocomposite system. These findings demonstrate that chitosan/PANI/MoO<sub>3</sub> nanocomposites are promising materials for optoelectronic devices, sensors, energy-storage systems, and environmentally sustainable applications.</p>

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Synthesis and investigation of thermal and optical properties of chitosan/polyaniline/MoO3 nanocomposites

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Sushma Prashanth,
  • Madihally Nagaraja

摘要

This study reports the synthesis and characterization of chitosan/polyaniline (PANI)/MoO3 hybrid nanocomposites prepared via oxidative polymerization using ammonium persulfate as the oxidizing agent. The structural and morphological properties were investigated using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM), confirming successful nanocomposite formation and the effective incorporation of MoO3 within the polymer matrix. Thermal analysis revealed improved thermal stability upon MoO3 incorporation. The chitosan/PANI/MoO3 (0.6 g) nanocomposite exhibited a higher residual weight (52.29%) and lower total weight loss (48%) than the chitosan/PANI matrix (42.44% residual weight and 58% weight loss) at 600 °C. Furthermore, the decomposition temperature increased by approximately 147 °C, indicating enhanced thermal resistance. DSC analysis further confirmed the delayed thermal degradation of the nanocomposite. Optical studies using diffuse reflectance spectroscopy revealed a reduction in the optical band gap with increasing MoO3 content. The optical band gap decreased from 2.74 to 2.63 eV with increasing MoO3 loading, suggesting enhanced electronic delocalization and modification of the electronic structure of the nanocomposite system. These findings demonstrate that chitosan/PANI/MoO3 nanocomposites are promising materials for optoelectronic devices, sensors, energy-storage systems, and environmentally sustainable applications.