On the origin of electrical conductivity in the bio-electronic material melanin

被引：82

作者：

Mostert, A. Bernardus ^{[1
]}

Powell, Ben J. ^{[1
]}

Gentle, Ian R. ^{[2
]}

Meredith, Paul ^{[1
]}

机构：

[1] Univ Queensland, Ctr Organ Photon & Elect, Sch Math & Phys, Brisbane, Qld 4072, Australia

[2] Univ Queensland, Ctr Organ Photon & Elect, Sch Chem & Mol Biosci, Brisbane, Qld 4072, Australia

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 09期

基金：

澳大利亚研究理事会;

关键词：

bioelectric phenomena; biomedical materials; electrical conductivity; macromolecules; molecular biophysics; photoconducting materials; skin; SYNTHETIC DOPA-MELANIN; BAND MODEL; PHOTOCONDUCTIVITY; EUMELANIN; BEHAVIOR; POLYMER; FILMS; DNA;

D O I：

10.1063/1.3688491

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The skin pigment melanin is one of a few bio-macromolecules that display electrical and photo-conductivity in the solid-state. A model for melanin charge transport based on amorphous semiconductivity has been widely accepted for 40 years. In this letter, we show that a central pillar in support of this hypothesis, namely experimental agreement with a hydrated dielectric model, is an artefact related to measurement geometry and non-equilibrium behaviour. Our results cast significant doubt on the validity of the amorphous semiconductor model and are a reminder of the difficulties of electrical measurements on low conductivity, disordered organic materials. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3688491]

引用

页数：3

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