Synthesis, Structural and Optical Characterization of MgO Nanocrystalline Embedded in PVA Matrix

Bdewi, Shahbaa F.; Abdullah, Omed Gh.; Aziz, Bakhtyar K.; Mutar, Ayad Abdulrazzaq

doi:10.1007/s10904-015-0321-3

Cited by 147 publications

(49 citation statements)

References 38 publications

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“…The existence of multiple diffraction peaks in the XRD pattern, confirms the polycrystalline nature of the CdO films [26] The mean grain size (G.S.) of the prepared samples was estimated from the full-width at the half-maximum (FWHM) of the highest intense peak at (222) plane, by using Debye-Scherrer formula [29,30]. The calculated values of grain size are given in Table 1.…”

Section: The Xrd Analysismentioning

confidence: 67%

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

2018

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Polycrystalline CdO:In 2 O 3 thin films for gas sensor applications were prepared on glass and silicon substrates by using one-step spray pyrolysis technique from the aqueous solution of CdCl 2 and InCl 3 at a substrate temperature of 300 °C. The structure, surface morphology, and the optoelectronic properties of prepared films were characterized respectively by means of X-ray diffraction (XRD), atomic force microscope and UV-visible spectroscopy. Based on the XRD results, the polycrystalline nature of CdO films has been confirmed, and In 2 O 3 films were found to exhibit a preferred orientation along (222) diffracted plane. The grain size varies between 9.0 and 28.4 nm. The results of Hall effect measurement of CdO:In 2 O 3 thin films confirms that all films were an n-type semiconductor. The electrical properties of prepared thin films and their sensitivity to nitrogen dioxide (NO 2) gas are also studied. The influence of the operating temperature and In 2 O 3 concentration on the NO 2 response were investigated. It is found that all films are sensitive to NO 2 gas, and the ideal operating temperature for the film contented 20 vol% of In 2 O 3 was found to be 200 °C at a gas concentration of 25 ppm. The sensing mechanism of the CdO:In 2 O 3 thin film is discussed and attributed to electron transfer between the sensing element and NO 2 molecules.

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Section: The Xrd Analysismentioning

confidence: 67%

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

2018

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“…In the case of pure PVA, a broad, intense peak observed at a scattering angle centered at 2θ = 19.25°, indicate the semicrystalline structure of PVA [ 19 , 20 ]. The occurrence of the semicrystalline structure of PVA mainly arose due to a strong intramolecular and intermolecular hydrogen bonding between PVA molecules [ 21 ]. The intensity of the characterized peak of PVA was gradually decreased with increasing salt content and disappeared at high salt concentrations, which implies the changes that occurred in the semicrystalline phase of the PVA matrix, due to the interaction between hydroxyl groups of the PVA and cations of the dissolved salt [ 22 , 23 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of High Ammonium Salt Concentration and Temperature on the Structure, Morphology, and Ionic Conductivity of Proton-Conductor Solid Polymer Electrolytes Based PVA

Saeed

Abdullah

2020

Membranes

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Polyvinyl alcohol (PVA) based proton-conducting solid polymer electrolyte was prepared with a high salt concentration of ammonium nitrate (NH4NO3) by the technique of solvent casting. From the X-ray diffraction studies, the semicrystalline nature of PVA with the inclusion of NH4NO3 was studied. XRD analysis indicates that the highest ion conductive sample exhibits the minimum crystalline nature. The decreasing trend of Jonscher-exponent with temperature rise reveals that the present system is insured by the correlated barrier hopping (CBH) model. The maximum room temperature conductivity was found to be 5.17 × 10−5 S/cm for PVA loaded 30 wt.% of NH4NO3. The ionic transport of the proton-conducting solid polymer electrolyte was studied at the temperature range of 303–353 K. The conductivity-temperature relationship of the systems was analyzed using both the Arrhenius and Vogel–Tammann–Fulcher (VTF) models to explain the ionic hopping mechanism for the system.

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“…However, the interaction between PbO NPs and the blend may result in breaking the H‐bond of OH groups of the blend, and hence the molecular chains are free to rotate . The bands observed at 2,883 and 2,996 cm −1 are characteristics of the symmetry and asymmetry stretching mode of CH 2 group . The later band (2,996 cm −1 ) is shifted to 2,983 cm −1 after blending with PVP and PbO NPs addition.…”

Section: Resultsmentioning

confidence: 99%

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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Synthesis, Structural and Optical Characterization of MgO Nanocrystalline Embedded in PVA Matrix

Cited by 147 publications

References 38 publications

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

Characterization and NO2 gas sensing performance of CdO:In2O3 polycrystalline thin films prepared by spray pyrolysis technique

Effect of High Ammonium Salt Concentration and Temperature on the Structure, Morphology, and Ionic Conductivity of Proton-Conductor Solid Polymer Electrolytes Based PVA

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

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