Raman and optical spectroscopy of eumelanin films

被引：72

作者：

Capozzi, V ^{[1
]}

Perna, G

Gallone, A

Biagi, PF

Carmone, P

Fratello, A

Guida, G

Zanna, P

Cicero, R

机构：

[1] Univ Foggia, Dipartimento Sci Biomed, Viale L Pinto, I-71100 Foggia, Italy

[2] Ist Nazl Fis Mat, Unita Bari, Bari, Italy

[3] Univ Bari, Dipartimento Interateneo Fis, I-70126 Bari, Italy

[4] Univ Bari, Policlin, Sez Biol Med, Dipartimento Biochim Med & Biol Med, I-70126 Bari, Italy

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2005年 / 744卷

关键词：

eumelanin; Raman effect; optical properties; photoluminescence;

D O I：

10.1016/j.molstruc.2004.11.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Melanin obtained from the liver of Rana esculenta L., was isolated from melanosomes and deposited as thin film on quartz substrate, in order to perform Raman, absorption and photoluminescence measurements at room temperature. The Raman spectrum was analysed by considering the contribution of the vibrational modes from different functional groups of the melanin structure. The absorption and photoluminescence measurements support the model that melanin consists of nano-aggregates of oligomeric structures rather than extended heteropolymer. An optical gap value of about 0.6 eV was estimated by considering the Tauc model. The largest size group of clusters mainly contribute to determine the optical gap value, whereas the PL emission is due to groups of clusters which are selectively pumped. (c) 2004 Published by Elsevier B.V.

引用

页码：717 / 721

页数：5

共 22 条

[1]

Bochenek K, 2003, ACTA PHYS POL B, V34, P2775

[2] Geometric and spectroscopic study of some molecules related to eumelanins.: 1.: Monomers [J].