Effect of graphene nanoplatelets concentration on optical, dielectric and electrical properties of poly(2-ethyl-2-oxazol
- PDF / 2,249,784 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 35 Downloads / 184 Views
Effect of graphene nanoplatelets concentration on optical, dielectric and electrical properties of poly(2‑ethyl‑2‑oxazoline)–polyvinylpyrrolidone–graphene nanocomposites Shubha A.1 · S. R. Manohara1 Received: 24 June 2020 / Accepted: 6 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The polymer nanocomposites with good optical, dielectric and electrical properties have taken faithfulness in research due to their distinguishing benefits in electronic applications. Hence, in the present investigation, poly(2-ethyl-2-oxazoline)– polyvinylpyrrolidone–graphene nanoplatelets (PEOX–PVP–GNPs) nanocomposites were synthesized and their properties were evaluated. Field emission scanning electron microscopy micrograph images showed a uniform dispersion of GNPs within the PEOX–PVP binary matrix. X-ray diffraction analysis illustrated the increase of crystallinity of nanocomposites with increasing weight percentage of GNPs. Fourier-transform infrared spectroscopy confirmed intermolecular interaction between the PEOX–PVP matrix and the GNPs. PEOX–PVP–graphene nanocomposite shows decrease in the optical energy band gap and increase in Urbach energy with increasing GNPs concentration. PEOX–PVP–10 wt% graphene nanocomposite has the lowest band gap (= 1.2 eV) and highest Urbach energy (= 7.43 eV). Dielectric constant, dielectric loss and tangent loss of nanocomposites decrease with increasing frequency of the applied electric field. On the other hand, the AC electrical conductivity of nanocomposites is independent of frequency, at lower frequencies, and increases with increasing frequency, at higher frequencies. PEOX–PVP–10 wt% graphene nanocomposite has the higher dielectric constant (= 16), low dielectric loss (= 0.09) and low AC conductivity (= 8.47 × 10−9 S/cm) at 1 kHz. This nanocomposite having good dielectric, electrical and optical properties may find use in electronic and optoelectronic applications due to its enhanced properties.
1 Introduction The addition of nanofiller to a polymer, to form polymer nanocomposite (PNC), will improve the properties of base polymer [1]. The properties in which there will be a substantial improvement include increased mechanical properties, increased electrical and thermal properties, decreased flammability and smoke emission, increased biodegradability of biodegradable polymers, decreased gas and water permeability, increased solvent and heat resistance, etc. [2]. The strong interfacial interaction between the polymer matrix and nanofiller is the main reason for the improved properties * S. R. Manohara [email protected] 1
Nano‑Composites and Materials Research Lab, Department of Physics, Siddaganga Institute of Technology (Affiliated to Visvesvaraya Technological University, Belgaum), Tumakuru, Karnataka 572 103, India
of polymer nanocomposites (PNCs). The PNCs have been synthesized by dispersing various other kind of fillers such as graphene, carbon fibre, carbon nanotubes, rare-earthdoped ions, metal oxides and hexagonal boron nitrid
Data Loading...
