title: Plant-derived cis-β-ocimene as a precursor for biocompatible, transparent, thermally-stable dielectric and encapsulating layers for organic electronics.
abstract: This article presents low-temperature, one-step dry synthesis of optically transparent thermally-stable, biocompatible cis-β-ocimene-based thin films for applications as interlayer dielectric and encapsulating layer for flexible electronic devices, e.g. OLEDs. Morphological analysis of thin films shows uniform, very smooth (Rq< 1 nm) and defect-free moderately hydrophilic surfaces. The films are optically transparent, with a refractive index of ~1.58 at 600 nm, an optical band gap of ~2.85 eV, and dielectric constant of 3.5-3.6 at 1 kHz. Upon heating, thin films are chemically and optically stable up to at least 200 °C, where thermal stability increases for films manufactured at higher RF power as well as for films deposited away from the plasma glow. Heating of the sample increases the dielectric constant, from 3.7 (25 °C) to 4.7 (120 °C) at 1 kHz for polymer fabricated at 25 W. Polymers are biocompatible with non-adherent THP-1 cells and adherent mouse macrophage cells, including LPS-stimulated macrophages, and maintain their material properties after 48 h of immersion into simulated body fluid. The versatile nature of the films fabricated in this study may be exploited in next-generation consumer electronics and energy technologies.
authors.affiliation: School of Chemistry, Physics, and Mechanical Engineering, Queensland University of Technology, Brisbane, QLD 4000 Australia.|Electronics Materials Lab, College of Science and Engineering, James Cook University, Townsville, QLD 4811 Australia.|Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD 4000, Australia.|Institute for Future Environments, Queensland University of Technology, Brisbane, QLD 4000, Australia.|CSIRO-QUT Joint Sustainable Materials and Devices Laboratory, Commonwealth Scientific and Industrial Research Organisation, P.O.Box 218, Lindfield, NSW 2070, Australia.
authors.forename: Kateryna
authors.initials: K
authors.lastname: Bazaka
authors.affiliation: Electronics Materials Lab, College of Science and Engineering, James Cook University, Townsville, QLD 4811 Australia.
authors.forename: Ryan
authors.initials: R
authors.lastname: Destefani
authors.affiliation: Electronics Materials Lab, College of Science and Engineering, James Cook University, Townsville, QLD 4811 Australia.
authors.forename: Mohan V
authors.initials: MV
authors.lastname: Jacob
mesh_terms: D000080462:Acyclic Monoterpenes; D000327:Adsorption; D000475:Alkenes / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry; D055664:Electrochemical Techniques; D004867:Equipment Design; D008422:Materials Testing; D010936:Plant Extracts / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry; D012031:Refractometry; D013816:Thermodynamics; D014173:Transistors, Electronic
chemical_list: D000080462:Acyclic Monoterpenes; D000475:Alkenes; D001672:Biocompatible Materials; D010936:Plant Extracts; D011108:Polymers; C443996:beta-ocimene