Structural, optical, and magnetic study of dilute magnetic semiconducting Co-doped ZnO nanocrystals synthesized using polymer-pyrolysis route

Farha, Ashraf Hassan; Mansour, Shehab A.; Kotkata, M. F.

doi:10.1007/s10853-016-0218-8

Cited by 27 publications

(23 citation statements)

References 45 publications

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“…In this study, ZnO nanocrystals (nc‐ZnO) have been prepared via two approaches where ammonium persulfate (APS) and sonochemical (SON) were used as different polymerization initiators. The typical synthesis procedure of ZnO via the polymer pyrolysis route using APS was done following the procedure in Ref . The polymer pyrolysis process is as follow: Zinc acetate dihydrate (Zn(CH 3 COO) 2 ·2H 2 O; Sigma‐Aldrich, St. Louis, MO) was dissolved in 20 g of an aqueous solution of acrylic acid (CH 2 =CHCOOH; Merck Millpore, Darmstadt, Germany).…”

Section: Methodsmentioning

confidence: 99%

“…A complete dissolving of the acetate was achieved at room temperature (RT) by constantly stirring to form well‐distributed salts. Hence, for one of the samples, named S1 (ZnO‐APS), 1 g of an aqueous solution of (APS) [(NH 4 ) 2 S 2 O 8 ] was added in drop wise to the solution to promote the polymerization process . Then, heating at 70‐80°C for ≈40 minutes until well‐distributed polyacrylate salts were formed.…”

Section: Methodsmentioning

confidence: 99%

“…The typical synthesis procedure of ZnO via the polymer pyrolysis route using APS was done following the procedure in Ref. 21 The polymer pyrolysis process is as follow: Zinc acetate dihydrate (Zn (CH 3 COO) 2 Á2H 2 O; Sigma-Aldrich, St. Louis, MO) was dissolved in 20 g of an aqueous solution of acrylic acid (CH 2 =CHCOOH; Merck Millpore, Darmstadt, Germany). A complete dissolving of the acetate was achieved at room temperature (RT) by constantly stirring to form well-distributed salts.…”

Section: Experimental 21 | Synthesization Of Zno Nanocrystalsmentioning

confidence: 99%

“…Hence, for one of the samples, named S1 (ZnO-APS), 1 g of an aqueous solution of (APS) [(NH 4 ) 2 S 2 O 8 ] was added in drop wise to the solution to promote the polymerization process. 21 Then, heating at 70-80°C for %40 minutes until well-distributed polyacrylate salts were formed. The other sample, named S2 (ZnO-SON) was taken after the dissolving step to the ultrasonic bath for 2 hours then that followed with drying the polyacrylate at 250°C for 2 hours.…”

Section: Experimental 21 | Synthesization Of Zno Nanocrystalsmentioning

confidence: 99%

“…In this method, the formation of the polymer is direct, easy to control, and obtained very quickly and the prepared polyacrylates are homogenous distributed with uniform particle size and a good stoichiometry . Nanoparticles of different types, such as ZnO doped with Ga and Co, ferrite nanoparticles (such as MnFe 2 O 4 , NiFe 2 O 4 , and ZnFe 2 O 4 ) and ferroelectric PbTiO 3 powders were prepared by using the polymer pyrolysis method.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and study of ZnO nanoparticles by polymer pyrolysis route using two different polymerization initiators

Mansour

Farha

Kotkata

2017

Int J Applied Ceramic Tech

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Ammonium persulfate (APS) and sonochemical (SON) as different polymerization initiators were used to obtain ZnO polyacrylate salt via an intermediate stabilized step for the synthesization of zinc oxide nanocrystals (nc‐ZnO). Impurity‐free nc‐ZnO with wurtzite structure was obtained, after calcinating both synthesized ZnO polyacrylic salts. The way by which the polymerization initiation was done greatly affect the morphological nature, shape, and size, of both synthesized samples. The obtained particle size values of the sample range from 15 to 45 nm when using APS (S1) and range from 58 to 120 nm when using sonochemical (S2). This difference in the range of particle size for both samples was reflected on the respective values of their optical energy gaps that found to be 3.33 and 3.26 eV for S1 and S2, respectively. The intensities and shift of the visible emissions of photoluminescence (PL) spectra showed strong correlation with the particle size of both considered samples. The photocatalytic activities (PCA) of the synthesized samples were tested using UV‐VIS irradiation for methyl orange (MO), where the difference in PCA for both samples was discussed in view of their PL spectra as well as their microstructure and morphology features.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Experimental 21 | Synthesization Of Zno Nanocrystalsmentioning

confidence: 99%

Section: Experimental 21 | Synthesization Of Zno Nanocrystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and study of ZnO nanoparticles by polymer pyrolysis route using two different polymerization initiators

Mansour

Farha

Kotkata

2017

Int J Applied Ceramic Tech

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Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe₂O₃ nanocrystals

Mansour

Elsad

Izzularab

2018

Polymers for Advanced Techs

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Iron oxide (α‐Fe2O3) nanocrystals powder was successfully synthesized via the sol‐gel method. The microstructural examination of the synthesized nanocrystals confirmed the formation of α‐Fe2O3 (hematite) structure using X‐ray diffraction and Fourier transform infrared. The synthesized nano‐hematite powder with different weight percentage up to 5 wt% was introduced to polyvinyl chloride (PVC) to fabricate PVC/Fe2O3 nanocomposites using the solution‐cast technique. The dielectric spectroscopic analysis for the investigated samples has been studied at room temperature and at different temperatures up to 120°C. The real part of the permittivity (ε′) exhibited a significant dependence on filler concentrations throughout whole temperature range. However, the dependency of both of the loss tangent (tanδ) and AC conductivity (σac) on filler concentrations is more pronounced at temperatures higher than room temperature. The obtained values of tan δ for the investigated nancomposites referred to the α‐relaxation around 70°C, which is close to glass transition temperature of the investigated PVC. The dependency of the dielectric strength on Fe2O3 nanofiller concentration was observed with enhancement in the dielectric strength reach to 20.5% for PVC/0.7 wt% Fe2O3 nanocomposite higher than the recorded value for the pristine PVC.

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Antimicrobial ZnO Nanoparticle–Doped Polyvinyl Alcohol/Pluronic Blends as Active Food Packaging Films

Amin

Partila

El‐Rehim

et al. 2020

Part & Part Syst Charact

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Today, plastic waste has been highlighted as one of the greatest threats to the environment. These environmental concerns and the increased necessity for safe food packaging have inspired scientists to focus on the development of active biodegradable materials. Herein, a novel poly(vinyl alcohol)/pluronic/ZnO nanocomposite film (PVA/PLUR/ZnO) is introduced as an active packaging material with enhanced antimicrobial activity. Gamma irradiation is used as a “green” route to prepare ZnO nanoparticles via a polymer pyrolysis method. The as‐prepared ecofriendly ZnO nanoparticles are characterized and incorporated into the PVA/PLUR matrix in different concentrations. Transmission electron microscopy and dynamic light scattering measurements prove that ZnO nanoparticles have a mean particle size of 30 nm with a spherical‐like morphology. Morphological and structural characterization confirm the successful incorporation of ZnO into the PVA/PLUR matrix, which in turn enhances the thermal and barrier properties of PVA/PLUR/ZnO nanocomposite films. On the other hand, the opacity of blends is increased. The PVA/PLUR/ZnO composites exhibit broad‐spectrum antimicrobial activity against Gram‐positive, Gram‐negative bacterial pathogens, and fungi, and the activity increases with increasing concentrations of ZnO nanoparticles. These results introduce PVA/PLUR/ZnO films as effective antimicrobial materials for active food‐packaging applications.

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Structural, optical, and magnetic study of dilute magnetic semiconducting Co-doped ZnO nanocrystals synthesized using polymer-pyrolysis route

Cited by 27 publications

References 45 publications

Synthesis and study of ZnO nanoparticles by polymer pyrolysis route using two different polymerization initiators

Synthesis and study of ZnO nanoparticles by polymer pyrolysis route using two different polymerization initiators

Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe₂O₃ nanocrystals

Antimicrobial ZnO Nanoparticle–Doped Polyvinyl Alcohol/Pluronic Blends as Active Food Packaging Films

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Structural, optical, and magnetic study of dilute magnetic semiconducting Co-doped ZnO nanocrystals synthesized using polymer-pyrolysis route

Cited by 27 publications

References 45 publications

Synthesis and study of ZnO nanoparticles by polymer pyrolysis route using two different polymerization initiators

Synthesis and study of ZnO nanoparticles by polymer pyrolysis route using two different polymerization initiators

Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe2O3 nanocrystals

Antimicrobial ZnO Nanoparticle–Doped Polyvinyl Alcohol/Pluronic Blends as Active Food Packaging Films

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Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe₂O₃ nanocrystals