Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 355, Issue 22-23, Pages 1221-1226Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2009.05.014
Keywords
Biopolymers; Conductivity; Absorption; Photoconductivity
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Natural and synthetic melanin have been investigated by means of optical, electrical and photoelectronic measurements. Optical measurements evidence absorption Curves which allow to estimate optical gap for synthetic melanin, by using Tauc's method. Dark conductivity and photoconductivity measurements were performed as a function of temperature and for different duration of thermal treatments. It has been evidenced that both quantities are thermally activated and thermal treatments play a very important role as far as gap states are concerned. (C) 2009 Elsevier B.V. All rights reserved.
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