Microstructure, dielectric response and electrical properties of polypyrrole modified (poly N-vinyl carbazole–Fe3O4) nanocomposites

Haldar, Ipsita; Biswas, Mukul; Nayak, A.

doi:10.1016/j.synthmet.2011.05.008

Cited by 15 publications

(3 citation statements)

References 36 publications

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“…The electric conductor/polymer composite is the main sort of high- k composites; its main advantage is that the composite with a small loading of dielectric conductors can get a high dielectric constant, so the composite has good processing characteristics. − However, generally, high dielectric loss is the big disadvantage of this kind of composite.…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Preparation of High-k Expanded Graphite/Carbon Nanotube/Cyanate Ester Composites with Low Dielectric Loss and Low Percolation Threshold

Cao

Zhang

et al. 2014

Ind. Eng. Chem. Res.

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Expanded graphites (EGs) or modified EGs (eEGs) were blended with multiwalled carbon nanotubes (MWCNTs) in a big weight ratio to prepare low-cost composites, coded as (EG-MWCNT)/cyanate ester (CE) or (eEG-MWCNT)/CE. The structures and properties of the composites are closely related to the loading of total conductors (f). When f < 0.75 wt %, EGs are beneficial for preparing high-k composites with low dielectric loss; however, when f ≥ 1.05 wt %, eEGs have superior advantages. When f = 1.5 wt %, the dielectric constant and loss of (eEG-MWCNT)1.5/CE composite are about 1.6 and 0.6 times that of the (EG-MWCNT)1.5/CE composite, respectively. The origin behind these interesting results was intensively discussed. Attractively, (EG-MWCNT)/CE and (eEG-MWCNT)/CE composites have similar percolation thresholds, so the surface modification of EGs does not increase the percolation threshold; moreover, ternary composites prepared herein have much better dielectric properties than both traditional EG/CE and MWCNT/CE composites.

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Section: Introductionmentioning

confidence: 99%

Low-Cost Preparation of High-k Expanded Graphite/Carbon Nanotube/Cyanate Ester Composites with Low Dielectric Loss and Low Percolation Threshold

Cao

Zhang

et al. 2014

Ind. Eng. Chem. Res.

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“…A number of metal and metal oxide particles have been encapsulated into the conducting polymer to form nanocomposites with improved electrical and dielectric properties. [7][8][9][10] Nowadays, many research works focused on development of carbon nanofillers reinforced conducting polymer nanocomposites with excellent percolation behavior and superior dielectric properties. [11][12][13] Among the carbon nanofillers, carbon nanotubes (CNTs) have received great attention because of their unique structural and integrated properties.…”

Section: Introductionmentioning

confidence: 99%

“…Several strategies have been explored in order to improve the dielectric properties of the conducting polymers, and the most common approach involves the inclusion of conductive nanofillers into polymer matrix. A number of metal and metal oxide particles have been encapsulated into the conducting polymer to form nanocomposites with improved electrical and dielectric properties . Nowadays, many research works focused on development of carbon nanofillers reinforced conducting polymer nanocomposites with excellent percolation behavior and superior dielectric properties .…”

Section: Introductionmentioning

confidence: 99%

Core-shell functionalized MWCNT/poly(m-aminophenol) nanocomposite with large dielectric permittivity and low dielectric loss

Verma

Kumar

Kar

et al. 2016

Polym. Adv. Technol.

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Core-shell carboxyl-functionalized multiwall carbon nanotube (c-MWCNT)/poly(m-aminophenol) (PmAP) nanocomposite were prepared through in-situ polymerization of m-aminophenol (m-AP) in the presence of MWCNTs, and explicated as a dielectric material for electronic applications. The formation of thin PmAP layer on individual c-MWCNT with excellent molecular level interactions at interfaces was confirmed by morphological and spectroscopic analyses. Here we conducted a comparative study of the dielectric performances of PmAP based nanocomposite films with pristine MWCNTs and c-MWCNTs as fillers. Compared to PmAP/MWCNT nanocomposites, the PmAP/c-MWCNT nanocomposites exhibited higher dielectric permittivity and lower dielectric loss. The well dispersed c-MWCNTs in PmAP/c-MWCNT nanocomposite produce huge interfacial area together with numerous active polarized centers (crystallographic defects), which in turn intensified the Maxwell-Wagner-Sillars (MWS) effect based on excellent molecular level interactions and thus, produce large dielectric permittivity (8810 at 1 kHz). The percolation threshold of PmAP/c-MWCNT nanocomposites is found lower than that of the PmAP/MWCNT nanocomposites, which could be attributed to homogeneous distribution of c-MWCNTs and strong c-MWCNT//PmAP interfacial interactions in the nanocomposites.

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Preparation and evaluation of microstructure, dielectric and conductivity (ac/dc) characteristics of a polyaniline/poly N-vinyl carbazole/Fe3O4 nanocomposite

2012

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Microstructure, dielectric response and electrical properties of polypyrrole modified (poly N-vinyl carbazole–Fe3O4) nanocomposites

Cited by 15 publications

References 36 publications

Low-Cost Preparation of High-k Expanded Graphite/Carbon Nanotube/Cyanate Ester Composites with Low Dielectric Loss and Low Percolation Threshold

Low-Cost Preparation of High-k Expanded Graphite/Carbon Nanotube/Cyanate Ester Composites with Low Dielectric Loss and Low Percolation Threshold

Core-shell functionalized MWCNT/poly(m-aminophenol) nanocomposite with large dielectric permittivity and low dielectric loss

Preparation and evaluation of microstructure, dielectric and conductivity (ac/dc) characteristics of a polyaniline/poly N-vinyl carbazole/Fe3O4 nanocomposite

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