Dipartimento di Matematica e Fisica, Università Cattolica, Brescia, Italy.
Langmuir. 2010 Dec 21;26(24):19007-13. doi: 10.1021/la102973u. Epub 2010 Nov 15.
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.
通过原子力显微镜和软 X 射线光谱研究了钾在合成真黑素聚集体形成中的作用。通过使用 K 盐，可以在真黑素薄膜的滴铸和电沉积过程中控制薄膜的颗粒度。通过选择合适的基底，可以进一步控制取向：在沉积在金上的薄膜中发现了自组装的证据。最后，结果表明，钾含量不仅影响样品的形态，而且影响价带中的低能态，在价带中观察到 HOMO-LUMO 隙的光谱权重转移，揭示了这种多功能生物大分子的可能应用。
