Studies on synthesis, structural, surface morphological and electrical properties of Pr6O11–MgO nanocomposite

Selvi, K. Tamizh; Alamelumangai, K; Priya, M.; Rathnakumari, M.; Kumar, Pankaj; Sagadevan, Suresh

doi:10.1007/s10854-016-4586-2

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…On the other hand with the increase of the Co amount in the nano-composite, the initially dielectric loss increment with frequency in the lower region afterward it lowers with frequency in the higher region. This behavior might be due to a high and absolute responsibility of the electric dipoles under the effect of the applied electric field frequency [60][61][62]. Although of these factors above, the loss behavior of the dielectric with frequency appears to be so sophisticated and demands further investigations.…”

Section: Dielectric Loss (ε′)mentioning

confidence: 99%

Study the influence of silver and cobalt on the photocatalytic activity of copper oxide nanoparticles for the degradation of methyl orange and real wastewater dyes

Zeid

Ibrahem

Mohamed

et al. 2020

Mater. Res. Express

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CuO (S1) Single pure component nanoparticles (SPCNPs), Ag/CuO (S2) binary component hybrid nanoparticles (BCHNPS), Co1/Ag/CuO (S3), and Co2/Ag/CuO (S4) ternary component hybrid nanoparticles (TCHNPS) were synthesized via co-precipitation method. Several spectroscopic methods investigated the characterization of the prepared catalysts. Based on Crystal properties, CuO exhibit a monoclinic phase (tenorite); the grain size of the prepared samples was 28.15 nm, 29.42 nm, 27.86 nm, and 26.67 nm for S1, S2, S3, and S4 respectively. The addition of different content from Co as a dopant to silver decorated CuO gives a clear change to a flake shape. The presence of the IR absorption peaks in the region 400-600 cm −1 matched to the distinctive stretching vibrations of Cu-O bonds in the monoclinic phase structure of CuO. Disappearance of the Raman peaks of CuO and appearing of the new characteristic peaks of cobalt oxide confirms the doping process. Using DRS analysis, arrange of the bandgap values were S1 > S2 > S3 > S4. For the synthetic methyl orange and raw industrial dye, the photodegradation parameters were measured. The results show the excellent activity of Co2/Ag/CuO NPS compared with other samples. Electrical studies of the catalysts show a higher value for the dielectric constant in the higher and lower frequency regions for the sample S4. The hopping process of the charge carrier's improving as a result of the increase of applied field frequency which leads to an increase in the material conductivity.

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Section: Dielectric Loss (ε′)mentioning

confidence: 99%

Study the influence of silver and cobalt on the photocatalytic activity of copper oxide nanoparticles for the degradation of methyl orange and real wastewater dyes

Zeid

Ibrahem

Mohamed

et al. 2020

Mater. Res. Express

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“…The fast decrease of the dielectric constant at lower frequencies is ascribed to the space charge polarization effect, which is correlated to the non-uniform charge accumulation at grain boundaries within the sphere-like PTO powders. The slow reduction of the dielectric constant is due to that the dipoles present in the PTO powders could not reorient themselves as fast as the frequency of an alternating electric field, resulting in a decrease of the dielectric constants [24]. In contrast, the rod-like PTO powders (c) and (d) synthesized by template MSS method exhibit a slight frequency-dependent dielectric behavior, their dielectric constants are slightly reduced with increasing frequency below 10 3 Hz, and then become a constant value of ~ 140.…”

Section: Resultsmentioning

confidence: 99%

Structural Characterizations and Dielectric Properties of Sphere- and Rod-Like PbTiO3 Powders Synthesized via Molten Salt Synthesis

Xue

et al. 2019

Nanoscale Res Lett

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By reaction of PbC 2 O 4 and TiO 2 in the eutectic NaCl-KCl salts, both sphere- and rod-like PbTiO 3 (PTO) powders were synthesized via molten salt synthesis (MSS) and template MSS methods, respectively. X-ray diffraction patterns reveal that all the PTO powders crystallize in a tetragonal phase structure. Increasing the molar ratio of PbC 2 O 4 :TiO 2 :NaCl:KCl from 1:1:10:10 to 1:1:60:60 in the MSS process has little effect on the sphere-like morphology of the PTO powders synthesized at 950 °C for 5 h. Large-scale polycrystalline rod-like PTO powders with diameters of 480 nm–1.50 μm and lengths up to 10 μm were synthesized at 800 °C for 5 h by template MSS method, where the rod-like anatase TiO 2 precursors were used as templates and the molar ratio of PbC 2 O 4 :TiO 2 :NaCl:KCl was equal to 1:1:60:60. X-ray energy dispersive spectroscopy spectra reveal that all the PTO powders are composed of Pb, Ti, and O elements, and the measured Pb:Ti atomic ratios are close to 1:1. In the template MSS process, the molten salt content plays an important role in forming the rod-like PTO powders. Under low molten salt content, the rod-like PTO powders cannot be synthesized even if the rod-like TiO 2 templates are used. In addition, prolonging the reaction time suppressed the formation of rod-like PTO powders but promoted the formation of sphere-like PTO nanoparticles. The dielectric properties the sphere- and rod-like PTO powders were comparatively investigated. At room temperature, the dielectric constant and dielectric loss of the spherical PTO powders synthesized by MSS method with the molar ratio of PbC 2 O 4 :TiO 2 :NaCl:KCl equal to 1:1:30:30 were ~ 340 and 0.06 (measured at 10 6 Hz), respectively. The corresponding values for the rod-like PTO powders synthesized by template MSS method with the molar ratio of PbC 2 O 4 :TiO 2 :NaCl:KCl equal to 1:1:60:60 were 140 and 0.08, respectively. The present results demonstrate the sphere-like PTO powders have better dielectric properties, which have promising applications in the fields of multilayer capacitors and resonators.

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“…It shows high electrical conductivity due to electron hopping between mixed metal ion valence states of lattice. 29 –31 The present study aims toward the preparation of novel proton conducting organic–inorganic nanocomposite membranes, which facilitates the best performance in terms of thermal stability and proton conductivity.…”

Section: Introductionmentioning

confidence: 99%

New series of organic–inorganic polymer nanocomposite membranes for fuel cell applications

Sivasubramanian¹,

Hariharasubramanian²,

Deivanayagam

2019

High Performance Polymers

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Flexible organic–inorganic polymer nanocomposite membranes with uniformly distributed metal oxide nanoparticles were prepared using sulfonated poly(ether ether ketone) (SPEEK) as a base material and praseodymium oxide (PSO) as an inorganic additive. The degree of sulfonation of SPEEK was determined by proton nuclear magnetic resonance (NMR) analysis and found to be 60%. The characteristic properties of the polymer nanocomposite membranes were examined by thermogravimetric analysis, X-ray diffraction, ion exchange capacity, water uptake ability, and proton conductivity. The incorporation of metal oxide into the polymer matrix was confirmed by scanning electron microscope with energy dispersive X-ray spectroscopy and X-ray diffraction analyses. The nanocomposite membrane exhibits good thermal stability when compared to that of the pristine membrane and SPEEK with 10 wt% of PSO loading was found to be stable up to 450°C. The assessment of polymer electrolyte membrane is accomplished by fabricating membrane electrode assemblies of pure SPEEK and SP-PSO-10 membranes and the latter produced maximum peak power density of 622 mW cm−2. The constructed SPEEK/PSO nanocomposite membranes offered superior physicochemical properties while applying these materials in an H2-O2 fuel cell.

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Studies on synthesis, structural, surface morphological and electrical properties of Pr6O11–MgO nanocomposite

Cited by 8 publications

References 28 publications

Study the influence of silver and cobalt on the photocatalytic activity of copper oxide nanoparticles for the degradation of methyl orange and real wastewater dyes

Study the influence of silver and cobalt on the photocatalytic activity of copper oxide nanoparticles for the degradation of methyl orange and real wastewater dyes

Structural Characterizations and Dielectric Properties of Sphere- and Rod-Like PbTiO3 Powders Synthesized via Molten Salt Synthesis

New series of organic–inorganic polymer nanocomposite membranes for fuel cell applications

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