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Nanomaterials 2017, 7(1), 11; doi:10.3390/nano7010011

Effects of Iodine Doping on Optoelectronic and Chemical Properties of Polyterpenol Thin Films

1
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia
2
CSIRO-QUT Joint Sustainable Materials and Devices Laboratory, Commonwealth Scientific and Industrial Research Organisation, P.O. Box 218, Lindfield, NSW 2070, Australia
3
College of Science and Engineering, James Cook University, Townsville, QLD 4814, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Krasimir Vasilev and Melanie Ramiasa
Received: 31 October 2016 / Revised: 16 December 2016 / Accepted: 22 December 2016 / Published: 13 January 2017
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Abstract

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 × 10−8 S/cm to 1.20 × 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. View Full-Text
Keywords: plasma polymerization; iodine doping; thin film; optical properties; organic polymer plasma polymerization; iodine doping; thin film; optical properties; organic polymer
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Bazaka, K.; Jacob, M.V. Effects of Iodine Doping on Optoelectronic and Chemical Properties of Polyterpenol Thin Films. Nanomaterials 2017, 7, 11.

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