The tunable permittivity of multi-walled carbon nanotubes/silver nanoparticles reinforced polyvinyl alcohol (PVA) nanocomposites at low frequency

Yusof, Yusliza and Ng, Zi Yi and Wong, Yew Hoong and Johan, Mohd Rafie (2018) The tunable permittivity of multi-walled carbon nanotubes/silver nanoparticles reinforced polyvinyl alcohol (PVA) nanocomposites at low frequency. Materials Research Express, 5 (8). 085604. ISSN 2053-1591

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Official URL: https://doi.org/10.1088/2053-1591/aad442

Abstract

This paper is about tailoring high permittivity of multi-walled carbon nanotubes/silver nanoparticles (MWNT-AgNP) filled polyvinyl alcohol (PVA) nanocomposites at low frequency. PVA/MWNT-AgNP nanocomposites were synthesized via solution-casting technique at low MWNT content with different loading of AgNP. The nanocomposites showed a significant increment in ac conductivity, σ ac, and dielectric permittivity, ϵ′ by two orders of magnitude as compared to pure PVA. The maximum ϵ′ value was achieved about 600 at 1.0 wt% of AgNP due to the increased charge carriers density and high interfacial polarization within the nanocomposites. The relaxation frequency was shifted towards a higher value with the increased of AgNP content while the relaxation time was decreased by 40%. Field emission scanning electron microscopy (FESEM) images showed the enhanced distribution of MWNT in the presence of AgNP to provide conductive pathways in the matrix. This was confirmed by energy-dispersive x-ray (EDX) analysis and ultraviolet-visible (UV-vis) spectroscopy. As a result, PVA/MWNT-AgNP nanocomposites have great potential for electrical applications such as cable accessories, high charge-storage capacitor and electromagnetic interference shielding materials.

Item Type: Article
Uncontrolled Keywords: carbon nanotubes; conductivity; microscopy; permittivity; silver nanoparticles
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 30 Jan 2019 03:59
Last Modified: 30 Jan 2019 03:59
URI: http://eprints.um.edu.my/id/eprint/20233

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