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.

Toward Environmentally Robust Organic Electronics: Approaches and Applications

“…Thus, organic electronic materials with low thermal stability cannot be developed into commercial electronic devices because of their poor processability and inadequate long‐term operational instability. To achieve thermally stable organic electronics, various approaches have been reported, including the development of thermally stable semiconducting and conducting materials, and the adoption of an encapsulation layer to protect the devices from high‐temperature‐induced degradation …”

The Electrical Properties of Plasma-Deposited Thin Films Derived from Pelargonium graveolens

“…This may be one of the explanations for the high value of the dielectric constants experimentally observed in the pelargonium films within the low frequency region. On the other hand, at higher frequencies, interfacial polarisation effects are significantly less dominant and do not have an important influence on dielectric constant values [44]. The dielectric constant for all polymers gradually decreases at higher frequencies, showing behavioural characteristics of a polymer insulating material.…”

“…This decrease can be associated with the increase in carbon and reduction in oxygen content in the films' structure with RF power [36]. In addition, it was documented that higher input powers increase the degree of cross-linking that render the polymer more dense, reducing the dielectric property and leakage current density [44]. power had a slight influence on the capacitance of pelargonium plasma polymer films.…”

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

“…In the low field region of 0–2.5 V, the J–V characteristic of pristine polyterpenol can be described by a power law relation, where J V n , and n = 0.94. Such value of n indicates an approximately ohmic conduction mechanism [ 42 ]. Exceeding 2.5 V, the value of n is 2.05 and 4.68 for 2.5–10 V and 10–20 V applied voltage, respectively, indicating non-ohmic charge transport for these regions.…”