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arXiv · 2509.15019

Nanoscale Charge Transport in Au@PANI Assemblies: Bulk-like Films and Linear Assemblies

Gyusang Yi·Borja Rodriguez-Barea·Gabriele Carelli·Lukas Mielke·Andreas Fery·Artur Erbe·Hendrik Schlicke
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Abstract

Hybrid nanostructures from metal nanoparticles equipped with conducting polymer shells are of great interest for use as functional materials in sensing and optoelectronics, as well as for ink-deposited conductors. Here, we investigate the charge transport mechanism of nanostructures composed of gold nanoparticles coated with a polyaniline shell (Au@PANI). In particular, we focus on how geometry influences the charge transport behavior. Highly ordered linear assemblies of Au@PANI nanoparticles were fabricated using template-assisted assembly, while bulk-like films were obtained via drop-casting. Temperature-dependent transport measurements were analyzed using established conductance models. Linear assemblies exhibit more localized transport, characterized by variable-range hopping (VRH) and thermally assisted tunneling (TAT), whereas bulk-like films show more delocalized transport, dominated by Arrhenius-type and thermionic conduction. These findings highlight the critical role of geometry, also due to its effect on electrical field strength in determining charge transport mechanisms in nanoparticle-based hybrid systems.

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Gyusang Yi, Borja Rodriguez-Barea, Gabriele Carelli, Lukas Mielke, Andreas Fery, Artur Erbe, Hendrik Schlicke. 2025-09-18. Nanoscale Charge Transport in Au@PANI Assemblies: Bulk-like Films and Linear Assemblies. https://arxiv.org/abs/2509.15019

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