Dielectric relaxation in polyvinyl alcohol–polypyrrole–multiwall carbon nanotube composites below room temperature

Chakraborty, Goutam; Gupta, K.; Rana, Dipak; Meikap, Ajit Kumar

doi:10.1088/2043-6262/4/2/025005

Cited by 44 publications

(21 citation statements)

References 20 publications

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“…The ease of preparation processes of polymer composites and the diverse range of applications are the driving force of continuous research in this arena. Another aspect of studying the polymer nanocomposite and polymer blend is the quest to understand the rich and intriguing physics of these complex systems [7][8][9][10][11][12][13][14]. If we can vary the property systematically by controlling the filler content into the matrix, it will surely open up new avenues of applications.…”

Section: Introductionmentioning

confidence: 99%

“…Decrease in the values of dc conductivity and effective permittivity with increasing loading of Ag particles were reported by Mahendia et al [34]. Polyvinyl alcohol-carbon nanotube (CNT) based composites have also been reported to be promising materials having interesting magneto transport properties [1,7,9]. Apart from these, electrical properties of PVA/ Barium Zirconium Titanate polymer ceramic composites [35] and polymer -Sr modified Barium Zirconium Titanate ceramic has also been studied by Senthil et al [36].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the dielectric relaxation and ac conductivity behavior of polyvinyl alcohol‐cadmium selenide nanocomposite films

et al. 2015

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We adopt an analytical approach to study the dielectric relaxation and ac conductivity behavior of the polyvinyl alcohol (PVA) -Cadmium Selenide (CdSe) nanocomposite films in the frequency range 100 Hz £ f £ 1 MHz and in the temperature range 298 K £ T £ 420 K. The CdSe nanoparticles are synthesized via a simple wet chemical route and are then impregnated into the polyvinyl alcohol matrix by 0.5 wt%, 1 wt%, and 4 wt%. About 1.7 times increase in effective permittivity (at 100 KHz) for the 4 wt% nanoparticle impregnated sample is observed from the analysis of the dielectric reinforcement function, which is attributed to the occurrence of interfacial polarization. It is found that the Cole-Cole model with a dc conductivity correction term can well fit the permittivity data. We have found that the dielectric relaxation time increases with increase in nanoinclusion into the matrix but decreases with increase in temperature. However, the space charge carrier conductivity and free charge carrier conductivity increase either with increase in nano inclusions or with increase in temperature. AC conductivity behavior have been analyzed considering the Jonscher power law and Dyre's random free energy barrier model, which reveals lowering of the maximum barrier height and correlated barrier hopping as the prevalent charge transport mechanism for the nanocomposites. Electric modulus study indicates similar conductivity relaxation dynamics for the nanocomposites but the responses deviate appreciably from the simulated ideal Debye responses. POLYM. COMPOS., 00:000-000, 2015.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the dielectric relaxation and ac conductivity behavior of polyvinyl alcohol‐cadmium selenide nanocomposite films

et al. 2015

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“…Measurement variance was a maximum at 0.1 and 0.2 wt % MWCNTs loading, indicating that the amount of MWCNT was insufficient for the formation of a network in the composite films while the MWCNT content was less than 0.1 wt %. However, with an increasing content of MWCNT in the PEDOT matrix, more and more networks are formed, resulting in a sharp increase in the conductivity of the composites . These observations indicated that the percolation threshold of the nanocomposite film was between 0.1 and 0.3 wt % MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

High cycling stability and well printability poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate)/multi‐walled carbon nanotube nanocomposites via in situ polymerization applied on electrochromic display

Chen

Liu

et al. 2017

J of Applied Polymer Sci

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A high cycling stability material and an additive manufacturing method are reported for the fabrication of solid electrochromic devices. The poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate)/multi‐walled carbon nanotube (PEDOT:PSS/MWCNT) nanocomposites were synthesized via in situ polymerization. A carboxymethyl cellulose gel was used as the ink vehicle for screen printing. The electrochromic (EC) performance of films patterned by screen printing was also examined. The results of characterization indicate that strong interfacial interactions occurred between PEDOT:PSS and the MWCNTs and the MWCNTs formed a network in these conducting polymers film, so the composite was more conductive than pure PEDOT:PSS. Devices containing PEDOT:PSS/MWCNTs were more stable after 1000 cycles, exhibited higher rate of ion exchange and faster increases in current. The composite containing 0.3 wt % MWCNTs also had a 23% higher color contrast (ΔE*) than pure PEDOT:PSS at 2.5 V applied voltages. The EC inks with well printability not only can be used to print large area films, but also can print fine lines and pixel‐type dots in displays. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45943.

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“…The dielectric parameter as a function of frequency is described by the complex permittivity in the form [1] e Ã ðvÞ ¼ e 0 ðvÞ À ie 00 ðvÞ; ð2Þ…”

Section: Dielectric Relaxation Studiesmentioning

confidence: 99%

Charge‐carrier relaxation dynamics and ac conductivity scaling of poly(3,4‐ethylenedioxythiophene) nanoparticles

Chutia

Kumar

2015

Physica Status Solidi (a)

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An investigation of the dielectric characteristics of poly(3,4-ethylenedioxythiophene) nanoparticles has been conducted in the frequency range 20 Hz-2 MHz and the temperature range of 80-300 K through the studies of dielectric permittivity, modulus formalism and ac conductivity. High-resolution transmission electron micrographs confirm the formation of well-ordered spherical nanoparticles. Micro-Raman spectra confirm the conformational transition from benzenoid to quinoid structure with increasing dopant concentration. Linear variation of imaginary permittivity with frequency suggests that the dc conduction process is more significant than interfacial polarisation. The presence of single relaxation peak in the imaginary modulus formalism indicates the Debye-type relaxation. The decrease of frequency exponent with temperature confirms that the charge transport takes place through correlated barrier hopping mechanism. The scaling of ac conductivity spectra confirms that the relaxation dynamics of charge carriers in the poly(3,4-ethylenedioxythiophene) nanoparticles system is temperature independent.

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Dielectric relaxation in polyvinyl alcohol–polypyrrole–multiwall carbon nanotube composites below room temperature

Cited by 44 publications

References 20 publications

Analysis of the dielectric relaxation and ac conductivity behavior of polyvinyl alcohol‐cadmium selenide nanocomposite films

Analysis of the dielectric relaxation and ac conductivity behavior of polyvinyl alcohol‐cadmium selenide nanocomposite films

High cycling stability and well printability poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate)/multi‐walled carbon nanotube nanocomposites via in situ polymerization applied on electrochromic display

Charge‐carrier relaxation dynamics and ac conductivity scaling of poly(3,4‐ethylenedioxythiophene) nanoparticles

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