Effects of iodine doping on optoelectronic and chemical properties of polyterpenol thin films

Bazaka, Kateryna, and Jacob, Mohan V. (2017) Effects of iodine doping on optoelectronic and chemical properties of polyterpenol thin films. Nanomaterials, 7 (1). pp. 1-16.

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Owing to their amorphous, highly cross-liked nature, most plasma polymers display dielectric properties. This study investigates iodine doping as the means to tune optoelectronic properties of plasma polymer derived from a low-cost, renewable resource, i.e., Melaleuca alternifolia oil. In situ exposure of polyterpenol to vapors of electron-accepting dopant reduced the optical band gap to 1.5 eV and increased the conductivity from 5.05 X 10-8 S/cm to 1.20 X 10-6 S/cm. The increased conductivity may, in part, be attributed to the formation of charge-transfer complexes between the polymer chain and halogen, which act as a cation and anion, respectively. Higher levels of doping notably increased the refractive index, from 1.54 to 1.70 (at 500 nm), and significantly reduced the transparency of films.

Item ID: 49966
Item Type: Article (Research - C1)
ISSN: 2079-4991
Keywords: plasma polymerization; iodine doping; thin film; optical properties; organic polymer
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© 2017 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/)

Funders: Australian Research Council (ARC)
Projects and Grants: ARC DE130101550
Date Deposited: 28 Aug 2017 02:50
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