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Proceedings Paper

Melanin: spin behaviour and implications for bioelectronic devices (Presentation Recording)
Author(s): Paul Meredith; Margarita Sheliakina; Bernard Mostert
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Paper Abstract

The melanins are a broad class of pigmentary macromolecules found through nature that perform a wide range of functions including photo-protection [1]. The most common melanin – the brown, black pigment eumelanin, has been much studied because of its role in melanoma and also for its functional material properties [2]. Synthetic eumelanin has been shown to be photoconductive in the solid state and also possess a water content dependent dark conductivity [3]. It is now well established that these electrical properties arise from hybrid ionic-electronic behaviour, leading to the proposition that melanins could be model biocompatible systems for ion-to-electron transduction in bioelectronics. In my talk, I will discuss the basic science behind these bioelectronics properties – electrical and optical. In this context I will also describe recent electron paramagnetic spin studies which isolate the role of the various chemical moieties responsible for the hybrid ionic-electronic behaviour. I will also highlight preliminary results on prototype melanin-based bioelectronics devices and discuss possible architectures to realise elements such as solid-state switches and transducers. [1] “The physical and chemical properties of eumelanin”, P. Meredith and T. Sarna, Pigment Cell Research, 19(6), pp572-594 (2006). [2] “Electronic and optoelectronic materials and devices inspired by nature”, P Meredith, C.J. Bettinger, M. Irimia-Vladu, A.B. Mostert and P.E. Schwenn, Reports on Progress in Physics, 76, 034501 (2013). [3] “Is melanin a semiconductor: humidity induced self doping and the electrical conductivity of a biopolymer”, A.B. Mostert, B.J. Powell, F.L. Pratt, G.R. Hanson, T. Sarna, I.R. Gentle and P. Meredith, Proceedings of the National Academy of Sciences of the USA, 109(23), 8943-8947 (2012).

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9568, Organic Field-Effect Transistors XIV; and Organic Sensors and Bioelectronics VIII, 95681P (5 October 2015); doi: 10.1117/12.2191024
Show Author Affiliations
Paul Meredith, The Univ. of Queensland (Australia)
Margarita Sheliakina, The Univ. of Queensland (Australia)
Bernard Mostert, The Univ. of Queensland (Australia)

Published in SPIE Proceedings Vol. 9568:
Organic Field-Effect Transistors XIV; and Organic Sensors and Bioelectronics VIII
Ioannis Kymissis; Iain McCulloch; Ruth Shinar; Oana D. Jurchescu; Luisa Torsi, Editor(s)

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