| Titre : |
Optical and temperature dependent electrical properties of poly (vinyl chloride)/copper alumina nanocomposites for optoelectronic devices |
| Type de document : |
texte imprimé |
| Auteurs : |
S. Suvarna, Auteur ; Annumaria Sebastian, Auteur ; Furhan, Auteur ; Manammel Thankappan Ramesan, Auteur |
| Année de publication : |
2023 |
| Article en page(s) : |
p. 154-156 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Alumine
Caractérisation
Chlorure de polyvinyle
Composites -- Propriétés optiques
Cuivre
Diélectriques
Matériaux hybrides
Modèles mathématiques
Stabilité thermique
Thermocinétique
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The practical applications of poly (vinyl chloride) have been constrained due to its poor thermal stability, low dielectric constant and inability to shield against ultraviolet (UV) radiation. In this study, we tried to improve the optical properties, thermal stability, temperature-dependent electrical conductivity and dielectric constant using copper alumina (Cu–Al2O3) nanoparticles reinforced poly (vinyl chloride) (PVC). Optical absorption measured with an ultraviolet-visible (UV-visible) spectrometer emphasises the blueshift in absorption edges and decreasing bandgap energies of PVC/Cu–Al2O3 nanocomposites compared to PVC. The presence of Cu–Al2O3 in PVC and its interaction with the polymer were confirmed by FTIR spectroscopy. Thermogravimetric analysis (TGA) demonstrates that nanocomposites have higher thermal stability than PVC, and that thermal stability increases with filler loading. Scanning electron microscopy (SEM) indicates the homogeneous dispersion of nanosized Cu–Al2O3 in the polymer matrix. The activation energy determined by the Arrhenius equation revealed that AC conductivity increases with the addition of nanoparticles up to a specific loading. The dielectric constant increases as a function of temperature and decreases with frequency. The magnitude of AC conductivity and dielectric constant were highest for 7 wt% loaded nanocomposites. The dielectric constant predicted by the Bruggeman and Maxwell-Garnet models were in good agreement with the experimental permittivity. The semiconducting nature of nanocomposites was investigated by impedance analysis. The semi-circular nature of Cole-Cole plots manifests the combination of parallel capacitance with low bulk resistance. The enhanced optical, thermal, electrical and dielectric properties of PVC/Cu–Al2O3 nanocomposites can be utilized in fabricating optoelectronic devices with excellent charge-storing ability. |
| Note de contenu : |
- EXPERIMENTAL : Materials and methods - Synthesis of copper alumina nanoparticles - Preparation of poly (vinyl chloride)/copper alumina nanocomposites - Characterizations
- RESULTS AND DISCUSSION : UV-visible spectroscopy - Optical bandgap energy - Fourier transform IR spectroscopy - SEM analysis - Thermogravimetric analysis - AC conductivity - Dielectric constant - Dielectric modelling - Impedance studies
- Table 1 : Activation energy of PVC/Cu–Al2O3 nanocomposites at different frequencies |
| DOI : |
https://doi.org/10.1515/ipp-2022-4270 |
| En ligne : |
https://drive.google.com/file/d/1PiSW7w4CgwZjlcALwPviqWqCkaTm2GKW/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39498 |
in INTERNATIONAL POLYMER PROCESSING > Vol. 38, N° 2 (2023) . - p. 154-156
Aller sur edunet
Accueil
Optical and temperature dependent electrical properties of poly (vinyl chloride)/copper alumina nanocomposites for optoelectronic devices in INTERNATIONAL POLYMER PROCESSING, Vol. 38, N° 2 (2023)
