Effect of temperature and frequency on the dielectric properties of cellulose nanofibers from cotton

Autor: Jishad A. Salam, Rani Abraham, Jasmine Jose, Raji Mary Mathew, Jancy John, Vinoy Thomas, Gijo Jose
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials Science: Materials in Electronics. 32:21213-21224
ISSN: 1573-482X
0957-4522
DOI: 10.1007/s10854-021-06624-9
Popis: The present work has been carried out to evaluate the dielectric properties and ac-electrical conductivity of cellulose nanofibers. The cellulose nanofibers (CNF) described in this work are the ones extracted from cotton via a simple acid hydrolysis method and are characterized with X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and UV–Visible diffuse reflectance spectroscopy. The optical band gap of CNF found out using the Kubelka–Munk plot is 3.30 eV. The dielectric constant, dielectric loss, and ac-electrical conductivity of the prepared CNF have been investigated in the temperature range from 30 °C to 300 °C and in the frequency range from 50 Hz to 5 MHz. The synthesized system exhibits a higher dielectric constant value for all temperatures in the low-frequency (0.1 kHz) region and a frequency-independent behavior above 10 kHz. In the high-frequency region, the dielectric constant is independent of temperature. Also, the study shows that the conductivity increases with increasing frequency and temperature. The maximum values of ac-conductivity at room temperature (30 °C) and high temperature (300 °C) are found to be 4.58 × 10–5 S/cm and 2.26 × 10–4 S/cm, respectively. In brief, the studies point to the application potential of CNF for future flexible electronics.
Databáze: OpenAIRE
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