α-Fe2O3 /(PVA + PEG) Nanocomposite films; synthesis, optical, and dielectric characterizations

Sayed, Adel M. El; Morsi, W. M.

doi:10.1007/s10853-014-8245-9

Cited by 98 publications

(48 citation statements)

References 62 publications

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“…This may be interpreted as follows; mixing CMC/PVA blend with Co 3 O 4 (E g < 2.0 eV) allows the formation of more number of conductive three-dimensional semiconducting networks throughout the nanocomposite which assist the charge carriers to hop from conducting clusters to neighbors. This observation agreed with the published data for different polymers [13,56]. Also, these results are consistent with the measurements of the DC conductivity.…”

Section: Ac Conductivity and Evaluation Of The Conduction Mechanismsupporting

confidence: 93%

“…11) as a function of T. It is obvious that the exponent s decreases with increasing the temperature, and its values are less than unity, i.e., 0 < s ≤ 1. This means that the values of s are in accordance with the theory of hopping conduction in amorphous materials [13]. Accordingly, these results lead to the prediction that the correlated barrier hopping (CBH) is the most suitable mechanism to explain the AC conduction behavior in the Co 3 O 4 /CMC/PVA/ nanocomposite films.…”

Section: Ac Conductivity and Evaluation Of The Conduction Mechanismsupporting

confidence: 79%

“…Polymers or blends having nano-sized fillers exhibits markedly improved mechanical, thermal, and optical properties when compared to pure polymers or their traditional composites. Also, improving the electrical and magnetic properties of the polymeric materials is the subject that attracts many investigators [5][6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and investigation of the electrical and dielectric properties of Co3O4/(CMC+PVA) nanocomposite films

Sayed

El‐Gamal

2015

J Polym Res

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Cobalt oxide (Co 3 O 4 ) nanoparticles (NPs), with average crystallite size<61 nm, were prepared by a sol-gel method. Two allowed direct optical band gaps of 1.445 and 1.915 eV are found for Co 3 O 4 NPs. Sodium carboxymethyl cellulose (Na-CMC)/polyvinyl alcohol (PVA) blend was doped with Co 3 O 4 at different concentrations<1.0 wt.% to study the electrical and dielectric properties of these nanocomposite films. Scanning electron microscopy images revealed a good dispersion of Co 3 O 4 NPs on the surface of the CMC/PVA films. The current-voltage characteristics are of non-ohmic behavior. The dielectric permittivity (ε') was studied in the frequency and temperature range of 5.0 kHz-5.0 MHz and 308-408 K and was found to depend on the Co 3 O 4 content. The dielectric loss (ε^) also increases and shows wave-like behavior with increasing Co 3 O 4 ratio. Increasing Co 3 O 4 NPs content leads to the formation of more number of three-dimensional semiconducting connected networks inside CMC/PVA matrix, leading to increasing both DC and AC conductivities. The correlated barrier hopping (CBH) is the most suitable mechanism to explain the AC conduction behavior in the Co 3 O 4 / Na-CMC/ PVA nanocomposite films.

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Section: Ac Conductivity and Evaluation Of The Conduction Mechanismsupporting

confidence: 93%

Section: Ac Conductivity and Evaluation Of The Conduction Mechanismsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Synthesis and investigation of the electrical and dielectric properties of Co3O4/(CMC+PVA) nanocomposite films

Sayed

El‐Gamal

2015

J Polym Res

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“…On the other hand, loading the CMC/PVP blend with PbO NPs greatly reduced T % in most of the studied wavelength range and became <38% at 4.0 wt% PbO film. The incorporation of PbO NPs inside the blend matrix may act as scattering centers that lead to the observed decrease in T % . The R spectra showed an opposite trend where R% of CMC decreased, in the region 330–390 nm, after mixing with PVP.…”

Section: Resultsmentioning

confidence: 98%

Preparation and characterization of PbO/carboxymethyl cellulose/polyvinylpyrrolidone nanocomposite films

et al. 2017

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Lead oxide nanoparticles (PbO NPs) and carboxymethyl cellulose (CMC)/polyvinylpyrrolidone (PVP) nanocomposite films were prepared by sol‐gel and solution casting methods respectively. The structural properties of the samples were investigated by X‐ray diffraction (XRD), high‐resolution transmission electron microscopy (HR‐TEM) and Fourier transformation infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) revealed the good dispersion of PbO NPs on the surface of the blend films. CMC film exhibits a transmittance (T) of 72%, increased after mixing with PVP and then decreased to <38% after adding 4.0 wt% PbO NPs. Both the direct and indirect optical band gaps (Eg) of CMC equal to 3.97 and 3.7 eV, respectively. These values were increased after PVP addition and then decreased after loading PbO NPs. The conduction mechanism in CMC/PVP blend has changed from Schottky emission to Poole–Frenkel due to the effects of temperature and PbO NPs content. The effect of adding PVP & PbO NPs on the DC conductivity and the activation energy Ea values of the CMC are discussed. The dielectric constant (ε′) was investigated in the frequency and temperature ranges of 1 kHz–1.0 MHz and 293–393 K respectively. Its values depend on both the PbO content and temperature. The AC conductivity σac was increased with increasing PbO content. The correlated barrier hopping (CBH) was found to be the most appropriate mechanism for explaining the AC conduction behavior. POLYM. COMPOS., 39:3712–3725, 2018. © 2017 Society of Plastics Engineers

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“…The end member hematite (a-Fe 2 O 3 , a = 5.04 Å , c = 13.75 Å ) crystallizes in the corundum structure with a space group of R " 3c [9] and is thermodynamically the most stable phase of iron oxide [10,11]. In the corundum structure, the O 2-anions build a hexagonal closed packed lattice where two thirds of the octahedral sites are occupied by Fe 3?…”

Section: Introductionmentioning

confidence: 99%

Insights into the structural, electronic, and magnetic properties of Fe2−x Ti x O3/Fe2O3 thin films with x = 0.44 grown on Al2O3 (0001)

et al. 2014

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α-Fe2O3 /(PVA + PEG) Nanocomposite films; synthesis, optical, and dielectric characterizations

Cited by 98 publications

References 62 publications

Synthesis and investigation of the electrical and dielectric properties of Co3O4/(CMC+PVA) nanocomposite films

Synthesis and investigation of the electrical and dielectric properties of Co3O4/(CMC+PVA) nanocomposite films

Preparation and characterization of PbO/carboxymethyl cellulose/polyvinylpyrrolidone nanocomposite films

Insights into the structural, electronic, and magnetic properties of Fe2−x Ti x O3/Fe2O3 thin films with x = 0.44 grown on Al2O3 (0001)

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