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Eumelanin thin films: solution-processing, growth, and charge transport properties.

Julia Wünsche¹, Fabio Cicoira, Carlos F O Graeff

¹Département de génie physique, École Polytechnique de Montréal, CP 6079, Succursale Centre-Ville, Montréal, Québec H3C 3A7, Canada. clara.santato@polymtl.ca.

Journal of Materials Chemistry. B

|April 9, 2020

Summary

Synthetic eumelanin thin films offer exciting possibilities for bioelectronics. Dimethyl sulfoxide processing yields homogeneous films with tunable electronic and ionic conductivity, crucial for device applications.

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Area of Science:

Materials Science
Biophysics
Nanotechnology

Background:

Eumelanin pigments possess unique properties like hydration-dependent conductivity and UV-vis absorption.
Solution-processing of synthetic eumelanins enables thin film fabrication for bioelectronic integration.

Purpose of the Study:

To investigate the impact of synthesis routes and solvents on eumelanin thin film properties.
To characterize the morphology, chemical composition, and electrical behavior of these films.

Main Methods:

Atomic force microscopy (AFM) for surface morphology and roughness analysis.
X-ray photoelectron spectroscopy (XPS) for chemical composition determination.
Transient electrical current measurements under varying humidity levels.

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Main Results:

Dimethyl sulfoxide (DMSO) is a superior solvent for producing homogeneous eumelanin films (<0.5 nm roughness).
Films exhibit quasi layer-by-layer growth composed of nanoaggregates (1-2 nm high, 10-30 nm large).
Electrical measurements reveal both electronic and ionic conductivity, with ionic contribution increasing at higher hydration.

Conclusions:

DMSO-processed eumelanin films are suitable for bioelectronic applications due to their homogeneity and tunable conductivity.
The hydration-dependent conductivity highlights the importance of water content in film performance.
Time-dependent electrical characterization is essential for understanding eumelanin film behavior in devices.