Journal
NANOMATERIALS
Volume 7, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/nano7010011
Keywords
plasma polymerization; iodine doping; thin film; optical properties; organic polymer
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Funding
- ARC DECRA [DE130101550]
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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.
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