Structural and Optical Properties of Novel (PS-Cr2O3/ ZnCoFe2O4) Nanocomposites For UV and Microwave Shielding

Habeeb, Majeed Ali; Hashim, Ahmed; Hayder, Noor

doi:10.21608/ejchem.2019.12439.1774

Cited by 40 publications

(11 citation statements)

References 23 publications

(25 reference statements)

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“…Since its first successful experiment in the chemistry of dyes by Augustus Schultz, It has remained the sole leather-tanning chemical [6]. Later, chromium oxides (Cr 2 O 3 ) have attracted great attention due to their contribution in many applications, such as coating for high temperature [7], the UV and microwave shielding [8], green pigments [9], solar energy collectors [10], photonic and electronic devices, heterogeneous catalysts [11,12] and hydrogen storage [13]. Moreover, as many nanometal oxides, such as aluminum oxides [14], titanium oxides [15], cupper oxides [16], magnesium oxides [17], iron oxides [18,19] and cerium oxides [20] have been shown an axcellent heavey metal adsoption from aqueous solutions, the spherical Cr 2 O 3 nanoparticles demonstrates a remarkable capacity in water treatment to extract azo-dye pollutant [21].…”

Section: Introductionmentioning

confidence: 99%

The removal of zinc ions from their aqueous solutions by Cr2O3 nanoparticles synthesized via the UV-irradiation method

et al. 2020

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Section: Introductionmentioning

confidence: 99%

The removal of zinc ions from their aqueous solutions by Cr2O3 nanoparticles synthesized via the UV-irradiation method

et al. 2020

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“…The figure pointed that the optical conductivity rises, which is indicative of the reduction of the direct band gap that is triggered by the addition of the dopant. This phenomenon occurs due to the generation of new states in the energy band gap that facilitates the charge carrier formation from the (V.B) to the (C.B) local levels [28,29,30].…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Evaluation of Optical Characteristics of (PVA-MnO2–ZrO2) Nanocomposites for Nanodevices in Optics and Photonics

2023

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We study the impact of (MnO2–ZrO2) nanoparticles on optical properties of (PVA) polymer. Several samples were produced with different weight ratios of (MnO2–ZrO2) nanoparticles. To prepare the selected samples, the casting method is used. To record the absorption spectrum, wavelengths of 200–1100 nm are applied. We have determined the absorption coefficient, energy gap for indirect transitions (forbidden and allowed), optical constants (such as the dielectric constant with its imaginary and real parts, refractive index, and attenuation coefficient), and optical conductivity. The results indicate that there is a proportional relationship between the optical constants and the concentration of (MnO2–ZrO2) nanoparticles, which means that an increase of the concentration of (MnO2–ZrO2) nanoparticles leads to an increase of the optical constants, while the transmission decreases. Additionally, the optical energy gap decreases from 4.83 eV to 3.4 eV and from 4.65 eV to 3.28 eV with increasing the concentration of (MnO2–ZrO2) nanoparticles for allowed and forbidden indirect transitions, respectively. These results can be considered as key ones for the use of (PVA-MnO2–ZrO2) nanocomposites in various fields such as optoelectronics and photonics.

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“…From the values of the absorption coefficient, it can be concluded that the nanocomposites have indirect energy band gap. The energy band gap decreases with increasing the Sb 2 O 3 , this attributed to decrease the distant between the conduction band and valance band with the increase Sb 2 O 3 concentration [28]. Figure 7 represents the extinction coefficient of nanocomposites as a function of the photon wavelength.…”

Section: (4)mentioning

confidence: 99%

“…From this figure, it can be seen that the absorption coefficient is increased with increasing of the Sb 2 O 3 concentration which may be due to the absorption by the impurities. The absorption coefficient is smaller and stable in the low photon energy because of the scattering of the photon energy [28]. Figures 5 and 6 show the energy band gap of nanocomposites.…”

Section: (4)mentioning

confidence: 99%

Effect of Antimony Oxide Nanoparticles on Structural, Optical and AC Electrical Properties of (PEO-PVA) Blend for Antibacterial Applications

Mohammed¹

2020

IJETER

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In this work, the (PEO-PVA-Sb 2 O 3 ) nanocomposites were prepared from (PEO-PVA) blend with different concentrations of the Sb 2 O 3 nanoparticles by using the casting method to used it for different modern applications such as: antibacterial, humidity sensors, solar cells, diodes, thermal energy storage and release …etc. The structural, optical and dielectric properties of (PEO-PVA-Sb 2 O 3 ) nanocomposites have been studied. The results of optical properties for nanocomposites showed that the absorbance has high values at UV region. Also, its increase while the transmittance and energy band gap reduce of (PEO-PVA) blend with the increase in Sb 2 O 3 nanoparticles concentrations. The absorption coefficient, extinction coefficient, refraction index, dielectric constant and optical conductivity are increased with the increase in Sb 2 O 3 nanoparticles concentrations. The dielectric properties of nanocomposites showed that the dielectric constant, dielectric loss and A.C electrical conductivity of (PEO-PVA) blend increase with the increase in Sb 2 O 3 nanoparticles concentrations. Also, the dielectric constant and dielectric loss of (PEO-PVA-Sb 2 O 3 ) nanocomposites decrease while the A.C electrical conductivity increases with the increase in frequency. finally, the (PEO-PVA-Sb 2 O 3 ) nanocomposites tested for antibacterial applications. The results showed that the the (PEO-PVA-Sb 2 O 3 ) nanocomposites have good activity for antibacterial.

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Structural and Optical Properties of Novel (PS-Cr2O3/ ZnCoFe2O4) Nanocomposites For UV and Microwave Shielding

Cited by 40 publications

References 23 publications

The removal of zinc ions from their aqueous solutions by Cr2O3 nanoparticles synthesized via the UV-irradiation method

The removal of zinc ions from their aqueous solutions by Cr2O3 nanoparticles synthesized via the UV-irradiation method

Fabrication and Evaluation of Optical Characteristics of (PVA-MnO2–ZrO2) Nanocomposites for Nanodevices in Optics and Photonics

Effect of Antimony Oxide Nanoparticles on Structural, Optical and AC Electrical Properties of (PEO-PVA) Blend for Antibacterial Applications

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