期刊
FRONTIERS IN CHEMISTRY
卷 7, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2019.00162
关键词
charge transport; vacuum thermal treatment; electrical conductivity; organic (bio)electronics; eumelanin; melanins; molecular orientation
资金
- Italian Ministry for Education, University and Research-Project RELIGHT [PON02_00556_3306937]
- Italian Ministry of Economic Development [E10/000798/02/E 17]
- European Commission FP7-PEOPLE-2013-IRSES [612538]
- Knowledge and Innovation Community (KIC) EIT RawMaterials-Network of Infrastructure OPTNEWOPT [P. A. 15065]
Melanin denotes a variety of mammalian pigments, including the dark electrically conductive eumelanin and the reddish, sulfur-containing, pheomelanin. Organic (bio)electronics is showing increasing interests in eumelanin exploitation, e.g., for bio-interfaces, but the low conductivity of the material is limiting the development of eumelanin-based devices. Here, for the first time, we report an abrupt increase of the eumelanin electrical conductivity, revealing the highest value presented to date of 318 S/cm. This result, obtained via simple thermal annealing in vacuum of the material, designed on the base of the knowledge of the eumelanin chemical properties, also discloses the actual electronic nature of this material's conduction.
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