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<p>Poly(4-chloroaniline) (P(4-CANI)) incorporating graphene oxide (GO) is promising for photonic and optoelectronic platforms, yet the effect of GO on structural and optical properties of P(4-CANI) remain largely unexplored. Here, (P(4-CANI)) and P(4-CANI)/GO nanocomposite films containing 2–6 wt% GO were synthesized via in-situ oxidative polymerization to investigate their structural and linear/nonlinear optical responses. XRD and FTIR analyses confirmed the insertion of GO within P(4-CANI) matrix and the interfacial interactions between GO and the polymer backbones. Moreover, SEM/TEM revealed a uniform platelet distribution and a porous interconnected morphology. Optical measurements showed a reduction in the direct band gap from 4.12&#xa0;eV for pristine P(4-CANI) to 3.60&#xa0;eV for the 6 wt% GO film, which accompanied by increased the Urbach energy, refractive index, optical dielectric parameters, and optical conductivity, indicating enhanced the carrier delocalization and polarization effects. At 200&#xa0;nm, the third-order susceptibility (χ<sup>(3)</sup>) and nonlinear refractive index (n<sup>(2)</sup>) increased from 8.5 × 10<sup>–16</sup> and 2.6 × 10<sup>–14</sup> esu of the pristine P(4-CANI) to 7.7 × 10<sup>–12</sup> and 1.1 × 10<sup>–10</sup> esu of the 6 wt% GO film, respectively. These results demonstrate that GO incorporation effectively tunes both linear and nonlinear optical responses of P(4-CANI), positioning the nanocomposite films as candidates for optical limiting, wave guide, and optical switching applications.</p>

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Structural, Linear, and Nonlinear Optical Properties of Poly(4-Chloroaniline)/Graphene Oxide Nanocomposites for Advanced Optoelectronic Applications

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • D. E. El Refaay,
  • Nuha Al-Harbi,
  • Abdelnaby H. Abosief,
  • M. M. Abdelhamied

摘要

Poly(4-chloroaniline) (P(4-CANI)) incorporating graphene oxide (GO) is promising for photonic and optoelectronic platforms, yet the effect of GO on structural and optical properties of P(4-CANI) remain largely unexplored. Here, (P(4-CANI)) and P(4-CANI)/GO nanocomposite films containing 2–6 wt% GO were synthesized via in-situ oxidative polymerization to investigate their structural and linear/nonlinear optical responses. XRD and FTIR analyses confirmed the insertion of GO within P(4-CANI) matrix and the interfacial interactions between GO and the polymer backbones. Moreover, SEM/TEM revealed a uniform platelet distribution and a porous interconnected morphology. Optical measurements showed a reduction in the direct band gap from 4.12 eV for pristine P(4-CANI) to 3.60 eV for the 6 wt% GO film, which accompanied by increased the Urbach energy, refractive index, optical dielectric parameters, and optical conductivity, indicating enhanced the carrier delocalization and polarization effects. At 200 nm, the third-order susceptibility (χ(3)) and nonlinear refractive index (n(2)) increased from 8.5 × 10–16 and 2.6 × 10–14 esu of the pristine P(4-CANI) to 7.7 × 10–12 and 1.1 × 10–10 esu of the 6 wt% GO film, respectively. These results demonstrate that GO incorporation effectively tunes both linear and nonlinear optical responses of P(4-CANI), positioning the nanocomposite films as candidates for optical limiting, wave guide, and optical switching applications.