期刊
JOURNAL OF MATERIALS CHEMISTRY B
卷 8, 期 35, 页码 8050-8060出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tb01390k
关键词
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资金
- Australian Research Council [DP140103653, FT120100694, FT120100421]
- Welsh European Funding Office (European Regional Development Fund) through the Ser Cymru II Program
- European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie grant [663830]
- University of Queensland International Scholarship
- University of Queensland International Postgraduate Research Scholarship
- University of Queensland (Strategic Initiative, Centre for Organic Photonics Electronics)
- EPSRC [EP/N020863/1] Funding Source: UKRI
- Australian Research Council [FT120100421] Funding Source: Australian Research Council
Long range electrical conduction in biomaterials is an increasingly active area of research, which includes systems such as the conductive pili, proteins, biomacromolecules, biocompatible conductive polymers and their derivatives. One material of particular interest, the human skin pigment melanin, is a long range proton conductor and recently demonstrated as capable of proton-to-electron transduction in a solid-state electrochemical transistor platform. In this work, a novel doping strategy is proposed to enhance and control melanin's proton conductivity, potentially enhancing its utility as a transducing material. By chelating the transition metal ion Cu(ii) into the bio-macromolecular matrix, free proton concentration and hence conductivity can be modulated. We confirm these observations by demonstrating enhanced performance in a next generation electrochemical transistor. Finally, the underlying mechanism is investigatedviathe use of a novelin situhydration-controlled electron paramagnetic resonance study, deducing that the enhanced proton concentration is due to controlling the internal solid-state redox chemistry of the intrinsic polyindolequinone structure. This doping strategy should be open to any transition metal ions that bind to hydroquinone systems (e.g.polydopamine). As such, the tailoring strategy could make other soft solid-state ionic systems more accessible to applications in bioelectronics, leading to the creation of higher performance ion-electron coupled devices.
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