Effects of Potassium on the Supramolecular Structure and Electronic Properties of Eumelanin Thin Films

被引：12

作者：

Borghetti, Patrizia ^{[1
]}

Goldoni, Andrea ^{[2
]}

Castellarin-Cudia, Carla ^{[2
]}

Casalis, Loredana ^{[2
]}

Herberg, Fabian ^{[3
]}

Floreano, Luca ^{[4
]}

Cossaro, Albano ^{[4
]}

Verdini, Alberto ^{[4
]}

Gebauer, Ralph ^{[5
,6
]}

Ghosh, Prasenjit ^{[5
]}

Sangaletti, Luigi ^{[1
]}

机构：

[1] Univ Cattolica, Dipartimento Matemat & Fis, Brescia, Italy

[2] Sincrotrone Trieste ScPA, Trieste, Italy

[3] Humboldt Univ, Dept Phys, Berlin, Germany

[4] CNR IOM, Lab TASC, Trieste, Italy

[5] Abdus Salam Int Ctr Theoret Phys ICTP, Trieste, Italy

[6] IOM CNR, DEMOCRITOS, Trieste, Italy

来源：

LANGMUIR | 2010年 / 26卷 / 24期

关键词：

MELANIN FILMS; BINDING; ORGANIZATION;

D O I：

10.1021/la102973u

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The role of potassium in the formation of synthetic eumelanin aggregates is investigated by atomic force microscopy and soft-X-ray spectroscopy. Control over the thin film granularity is achieved by using K salts, in both drop casting and electrodeposition of eumelanin thin films. Further control over orientation is made possible by a suitable choice of the substrate: evidence of self-assembly is found for thin films deposited on gold. Finally, it is shown that the potassium content affects not only the samples morphology, but also the low-lying states in the valence band, where a transfer of spectral weight across the HOMO-LUMO gap is observed, disclosing possible applications of this multifunctional biomacromolecule.

引用

页码：19007 / 19013

页数：7

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