Optical and photoelectronic properties of melanin

被引：72
作者：
Capozzi, V
Perna, G
Carmone, P
Gallone, A
Lastella, M
Mezzenga, E
Quartucci, G
Ambrico, M
Augelli, V
Biagi, PF
Ligonzo, T
Minafra, A
Schiavulli, L
Pallara, M
Cicero, R
机构：
[1] Univ Foggia, Dipartimento Sci Biomed, I-71100 Foggia, Italy
[2] Ist Nazl Fis Mat, Sez Bari, I-70126 Bari, Italy
[3] CNR, Ist Metodol Inorgan & Plasmi, I-70126 Bari, Italy
[4] Univ Bari, Dipartimento Interateneo Fis, I-70126 Bari, Italy
[5] Univ Bari, Dipartimento Geomineral, Bari, Italy
[6] Univ Bari, Dipartimento Biochim Med & Biol Med, Sez Biol Med, Fac Med & Chirurg, I-70124 Bari, Italy
来源：
THIN SOLID FILMS | 2006年 / 511卷
关键词：
eumelanin; optical properties; photoconductivity;
D O I：
10.1016/j.tsf.2005.12.065
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A study of the structural, optical and electrical properties of synthetic and natural melanin by means of X-ray diffraction, absorption and photocurrent techniques is reported. The model of the natural melanin film as a network of nano-aggregates of polymeric units based on the indolic structure is proposed to explain the X-ray diffraction results. The shape of the absorption spectra is similar to that of amorphous and disordered semiconductors, with a very strong, broad band UV and visible absorption and an optical gap value of about 0.5 eV Photosensitivity to sun spectra has been demonstrated by photoconductivity measurements of synthetic melanin pellets under AM1 light source illumination. (c) 2005 Elsevier B.V. All rights reserved.
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页码：362 / 366
页数：5
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