Conductive biomolecular systems are investigated for their promise of new technologies. One biomolecular material that has garnered interest for device applications is eumelanin. Its unusual properties have led to its incorporation in a wide set of platforms including transistor devices and batteries. Much of eumelanin's conductive properties are due to a solid state redox comproportionation reaction. However, most of the work that has been done to demonstrate the role of the redox chemistry in eumelanin has been via control of eumelanin's hydration content with scant attention given to temperature dependent behavior. Here we demonstrate for the first time consistency between hydration and temperature effects for the comproportionation conductivity model utilizing dielectric spectroscopy, heat capacity measurements, frequency scaling phenomena and recognizing that activation energies in the range of ∼0.5 eV correspond to proton dissociation events. Our results demonstrate that biomolecular conductivity models should account for temperature and hydration effects coherently.

Department of Chemistry Swansea University Singleton Park SA2 8PP Wales UK

Institute for Metallic Materials IFW Dresden 01069 Dresden Germany

Institute for Solid State and Materials Physics TU Dresden 01069 Dresden Germany

Institute of Physics AS CR Praha 8 Czech Republic

Moscow Institute of Physics and Technology 141701 Institutsky lane 9 Dolgoprudny Russia

Prokhorov General Physics Institute of the Russian Academy of Sciences 119991 Vavilov Street 38 Moscow Russia

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