Polymerization of pyrrole derivatives on polyacrylonitrile matrix, FTIR–ATR and dielectric spectroscopic characterization of composite thin films

Çetiner, Suat; Karakas, Hale; Ciobanu, Romeo Cristian; Olariu, Marius; Kaya, N. Ugur; Unsal, Cem; Kalaoğlu, Fatma; Sarac, A. Sezai̇

doi:10.1016/j.synthmet.2010.03.007

Cited by 62 publications

(49 citation statements)

References 33 publications

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“…The real and imaginary components of permittivity correspond to the storage and loss of energy in each cycle of the applied electric field. [34][35][36] Figures 1(a) and (b) show the variation of dielectric constant and dielectric loss of F(APS + AQSA) with frequency. It is observed that the values of dielectric constant and dielectric loss increase with increasing PPy amount and decrease with increasing frequency from 10 2 to 10 7 Hz.…”

Section: Resultsmentioning

confidence: 99%

“…The decrease of dielectric constant with increasing frequency is an expected behavior in most dielectric materials, but the difference between the values at low and high frequencies is significant in the case of conductive polymers. 35 The initial value of the dielectric constant of polar materials is high at lower frequencies. If the frequency starts to increase, the dielectric constant begins to drop and electric dipoles do not follow the field variations at higher frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…At higher frequencies, the polarization due to charge accumulation decreases, which leads to the decrease in the value of the dielectric constant with increasing frequency. [34][35][36] However, frequency has a greater effect on both the dielectric constant and dielectric loss with the increase of PPy content. While the dielectric constant increases 8.5 times, the dielectric loss increases by nearly 50 times at 10 2 Hz when the PPy content reaches 32 wt%.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric and morphological studies of nanostructured polypyrrole-coated cotton fabrics

Çetiner

2014

Textile Research Journal

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In this study, nanostructured polypyrrole (PPy)-coated cotton textiles were produced by in situ chemical oxidative polymerization and dielectric/electrical properties of PPy-coated cotton fabrics were presented in the low-and highfrequency regions. The conductive cotton fabrics showed a relatively high dielectric constant in the low-and radiofrequency region. The dielectric constant and dielectric loss for all fabrics presented relatively high values at low frequency and were found to decrease with the frequency. The influence of the PPy content and the type of dopant and oxidant on the morphological, dielectric/electrical and thermal properties of the cotton fabrics was investigated. It was found that the type of dopants and oxidants had a noticeable effect on the electrical/dielectric and morphological properties. The frequency dependence of AC conductivity, dielectric constant, dielectric loss and electric modulus were analyzed in the frequency range from 0.1 kHz to 10 MHz. The nanofiber network morphology of coated fabrics produced by dodecylbenzenesulfonic acid sodium salt improved the electrical/dielectric and thermal properties of cotton composites.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Dielectric and morphological studies of nanostructured polypyrrole-coated cotton fabrics

Çetiner

2014

Textile Research Journal

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“…The characteristic peaks at 2243 and 1454 cm −1 corresponded to the stretching vibration of the nitrile groups (–CN–) and the bending vibration of the methylene of the PAN, respectively. [37,38]. The characteristic peaks of PPy–PAN nanofiber yarns at 2925 and 2243 cm −1 were significantly reduced, which indicated that the synthesis of polypyrrole weakened the original characteristic functional group in PAN.…”

Section: Resultsmentioning

confidence: 99%

A Fast Response Ammonia Sensor Based on Coaxial PPy–PAN Nanofiber Yarn

Liu

Zhang

et al. 2016

Nanomaterials

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Highly orientated polypyrrole (PPy)–coated polyacrylonitrile (PAN) (PPy–PAN) nanofiber yarn was prepared with an electrospinning technique and in-situ chemical polymerization. The morphology and chemical structure of PPy–PAN nanofiber yarn was characterized by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and fourier transform infrared spectroscopy (FTIR), which indicated that the PPy as the shell layer was homogeneously and uniformly polymerized on the surface of PAN nanofiber. The effects of different concentration of doping acid on the responses of PPy–PAN nanofiber yarn sensor were investigated. The electrical responses of the gas sensor based on the PPy–PAN nanofiber yarn to ammonia were investigated at room temperature. The nanoyarn sensor composed of uniaxially aligned PPy–PAN nanofibers with a one-dimensional structure exhibited a transient response, and the response time was less than 1 s. The excellent sensing properties mentioned above give rise to good potential application prospects in the field of ammonia sensor.

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“…This is a typical behavior of the polymers indicating that polarization increases with the temperature increase. [22,23] The lower value of e¢ in the composites indicates that doping process reduced the total dipole moment. This situation can be due to Cr ions penetrating into the structure by doping, coordinating with the S atoms and reducing the total dipole moment of the C-S dipoles, as shown in the suggested interaction mechanism (Fig.…”

Section: Dsc Analysismentioning

confidence: 98%

Structural and Dielectric Properties of Polythiophene/Chrom(III) Acetylacetonate Composites

Tarcan

2015

Journal of Macromolecular Science, Part B

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The dielectric and morphological properties of polythiophene (PT) filled with various mass fractions of chrom(III) acetylacetonate (Cr(acac) 3 ), synthesized via chemical oxidative polymerization, are described. Significant shifts of the absorption peak of the C-S bond in the Fourier transform infrared (FT-IR) spectra indicated that the metal cations mostly interacted with sulfure atoms. Thermal analyses performed by differential scanning calorimetry (DSC) indicated that the cold crystallization temperature (T cc ) of PT decreased with increasing doping level.Microstructural differences were observed between PT and its composites in scanning electron microscopy (SEM) images. Dielectric measurements showed that the conductivity of the PT significantly increased with increasing doping level, from ~10 -7 S/m to ~10 -4 S/m at 10 kHz and 300 K.

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Polymerization of pyrrole derivatives on polyacrylonitrile matrix, FTIR–ATR and dielectric spectroscopic characterization of composite thin films

Cited by 62 publications

References 33 publications

Dielectric and morphological studies of nanostructured polypyrrole-coated cotton fabrics

Dielectric and morphological studies of nanostructured polypyrrole-coated cotton fabrics

A Fast Response Ammonia Sensor Based on Coaxial PPy–PAN Nanofiber Yarn

Structural and Dielectric Properties of Polythiophene/Chrom(III) Acetylacetonate Composites

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