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Electrochemically Deposited Ag/PANI on ITO: Non-Monotonic Disorder-Dispersion Coupling and Enhanced Third-Order
Mahmoud AlGharram1, Tariq AlZoubi2, Yahia Makableh2
1Department of Physics, School of Computing (SC), German Jordanian University, Amman 11180, Jordan.
Polymers
|April 14, 2026
Summary
This study maps the optical and nonlinear properties of silver/polyaniline (Ag/PANI) nanocomposites. Optimal nonlinear performance depends on a balance of disorder and microstructure, not just silver content.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Conducting polymer-metal nanocomposites are key for tunable photonic and optoelectronic devices.
- Empirical property trends limit understanding, especially for electrochemically grown polyaniline (PANI) coatings with nanoparticles.
- Nanoparticle incorporation in PANI can enhance polarization but also introduce heterogeneity.
Purpose of the Study:
- To address the research gap by quantifying electronic disorder, refractive-index dispersion, dielectric response, and third-order nonlinearity in Ag/PANI nanocomposite films.
- To establish a composition-structure-optics map for device-relevant Ag/PANI films.
- To elucidate the factors governing nonlinear optical performance in these nanocomposites.
Main Methods:
- Fabrication of Ag/PANI nanocomposite thin films on indium tin oxide (ITO) via potentiostatic electrodeposition with controlled Ag nanoparticle loadings (5-15 wt.%).
- Integration of optical-disorder and dispersion formalisms.
- Dielectric and nonlinear optical analyses, including Wemple-DiDomenico modeling and Drude-type dielectric dispersion.
Main Results:
- Ag incorporation narrowed the indirect optical gap and broadened the Urbach tail.
- Dielectric properties showed non-monotonic evolution, with high dielectric constants and plasma frequencies at 15 wt.% Ag.
- Third-order nonlinearity (χ³) was enhanced but composition-sensitive, peaking at 5 wt.% Ag, with optimal performance linked to disorder-dispersion balance and local-field effects.
Conclusions:
- A comprehensive composition-structure-optics map was established for Ag/PANI nanocomposites.
- Optimal nonlinear optical performance is governed by a balance of electronic disorder and dispersion, influenced by microstructure and local-field effects.
- The findings provide critical insights for designing advanced optoelectronic and photonic materials based on polymer-metal nanocomposites.
