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Engineering proton conductivity in melanin using metal doping.

A Bernardus Mostert¹, Shermiyah B Rienecker, Margarita Sheliakina

¹Department of Chemistry, Swansea University, Singleton Park, SA2 8PP, Wales, UK. a.b.mostert@swansea.ac.uk.

Journal of Materials Chemistry. B

|August 12, 2020

Summary

This summary is machine-generated.

Researchers enhanced melanin's proton conductivity using a novel transition metal ion doping strategy. This method improves melanin's performance in bioelectronic devices by modulating its ion-electron coupling capabilities.

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Area of Science:

Biomaterials science
Bioelectronics
Materials chemistry

Background:

Long-range electrical conduction in biomaterials is crucial for bioelectronic applications.
Melanin, a human skin pigment, exhibits proton conductivity and proton-to-electron transduction.
Controlling melanin's conductivity is key to enhancing its utility in devices.

Purpose of the Study:

To develop a novel doping strategy to enhance and control melanin's proton conductivity.
To investigate the mechanism behind enhanced proton conductivity in doped melanin.
To demonstrate improved performance of melanin in electrochemical transistors.

Main Methods:

Chelating transition metal ions (Cu(II)) into the melanin matrix.
Fabricating and testing next-generation solid-state electrochemical transistors.
Utilizing in situ hydration-controlled electron paramagnetic resonance (EPR) spectroscopy.

Main Results:

The proposed doping strategy successfully enhanced and controlled melanin's proton conductivity.
Doped melanin demonstrated improved performance in electrochemical transistors.
EPR studies revealed that doping modulates the internal solid-state redox chemistry of melanin's polyindolequinone structure, increasing proton concentration.

Conclusions:

Transition metal ion doping is an effective strategy to tailor melanin's proton conductivity for bioelectronic applications.
This approach offers a pathway to create higher-performance ion-electron coupled devices.
The doping strategy is potentially applicable to other soft solid-state ionic systems like polydopamine.