Probing the Interface Activation in Designing Defect-Free Multilayered Polymer Nanocomposites for Dielectric Capacitor Applications

Prateek, P and Bhunia, R and Garg, A and Gupta, RK (2020) Probing the Interface Activation in Designing Defect-Free Multilayered Polymer Nanocomposites for Dielectric Capacitor Applications. In: Journal of Physical Chemistry C .

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Abstract

Herein, we have successfully demonstrated the microstructural evidence of the inhomogeneous interfaces in multilayered capacitors and explained the role of interface activation in the dielectric performance. Robust and homogeneous interfaces in the barium titanate nanoparticles (BT NPs)/polyvinylidene fluoride (PVDF) polymer nanocomposites were developed using a polyvinylpyrrolidone (PVP) linker to link the top and bottom layers and a spin-coating approach. The cross-sectional field emission scanning electron microscopy depicted a clear picture of loosely bonded interfaces without PVP in a multilayered capacitor. The optimized PVP concentration (PVP2 = 30 mg mL-1) provided homogeneous interfaces. The energy density of PVDF-PVDF was the lowest among different devices, with a value of 1.6 J cm-3 at 1872 kV cm-1, and it was increased to 3.8 J cm-3 at 3400 kV cm-1 with PVP2 addition in PVDF-PVP2-PVDF. The 5 vol BT NPs in BT/PVDF-PVP2-BT/PVDF (5 vol BP2B) exhibited a maximum energy density of 6.2 J cm-3 at a much higher breakdown field of 4474 kV cm-1, which was �100, �300, and �400 higher than those of PVDF, PVDF-PVDF, and state-of-the-art biaxially oriented polypropylene capacitors, respectively. Also, the trilayered device demonstrated a better dielectric performance than five-layered devices. Thus, the middle layer accompanies the interface homogeneity and eliminates the use of surface-functionalized nanofillers in a multilayered capacitor. This work will provide a mechanistic approach to develop low-cost, defect-free, and high energy density capacitors using a simple solution process route. ©

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry C
Publisher:	American Chemical Society
Additional Information:	The copyright of this article belongs to American Chemical Society
Keywords:	Barium titanate; Chemical activation; Field emission microscopes; Fluorine compounds; Polypropylenes; Scanning electron microscopy, Barium titanate nanoparticles; Bi-axially oriented polypropylenes; Dielectric capacitors; Dielectric performance; Field emission scanning electron microscopy; High energy density capacitors; Loosely bonded interfaces; Polymer nanocomposite, Nanocomposites
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	17 Feb 2021 09:21
Last Modified:	17 Feb 2021 09:21
URI:	http://eprints.iisc.ac.in/id/eprint/67436

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