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Redox chemistry in the pigment eumelanin as a function of temperature using broadband dielectric spectroscopy

机译：用宽带介电光谱法作为温度的函数eumelanin的氧化还原化学

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摘要

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.
机译：调查导电生物分子系统以担任新技术的承诺。一种为器件应用获得兴趣的一种生物分子材料是eumelanin。其不寻常的属性导致其在一系列平台上，包括晶体管器件和电池。大部分欧马林的导电性能是由于固态氧化还原的掺杂剂。然而，已经展示了氧化还原化学在eumelanin中的作用的大部分工作已经通过控制eumelanin的水合含量，并给予温度依赖性行为。在这里，我们证明了利用介电光谱，热容量测量，频率缩放现象和识别在〜0.5eV范围内的激活能量的介电光谱，热容量测量，频率缩放现象之间的第一次持续性。我们的结果表明，生物分子电导率模型应连续地占温度和水化效果。

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