Structural and electrical properties of sol–gel grown nanostructured ZnO and LaMnO3 particle-based nanocomposites

Kanabar, Naisargi; Gadani, Keval; Shrimali, V.G.; Sagapariya, Khushal; Rathod, K.N.; Udeshi, Bhagyashree; Joseph, Joyce; Pandya, D.D.; Solanki, P.S.; Shah, N.A.

doi:10.1007/s00339-020-04243-5

Cited by 16 publications

(3 citation statements)

References 65 publications

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“…Figure 10 demonstrates the log frequency-dependent the real part (M') and the imaginary part (M'') of 0%TC, 2%TC, 4%TC and 6%TC samples. The real part (M 0 ) has nearly zero value in the low frequency region, indicating a negligible influence from electrodes [65]. At higher frequency, the real part (M 0 ) of the complex modulus increases throughout the frequency range used.…”

Section: Electrical Modulus Analysismentioning

confidence: 98%

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Youssef

Yakout

2023

J Mater Sci: Mater Electron

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Tetra-doping by (Mn, Fe, Co, Ni) ions strongly boosted the room temperature dielectric constant and the ferromagnetic-superparamagnetic characteristics of monoclinic CuO structure. In this study, undoped CuO, Cu0.98Mn0.005Fe0.005Co0.005Ni0.005O, Cu0.96Mn0.01Fe0.01Co0.01Ni0.01O and Cu0.94Mn0.015Fe0.015Co0.015Ni0.015O nanocompositions were synthesized through coprecipitation technique. The crystal structure analysis verified that all samples have a pure single phase, corresponding to monoclinic CuO structure. The substitution of Cu2+-sites into CuO lattice by Mn2+, Fe2+/3+, Co2+ and Ni2+ ions has been deduced from the expansions of lattice constant, shifts of XRD diffraction peaks and band gap energy alteration. The additions of (Mn, Fe, Co, Ni) ions lead to the formation of homogenous distributed very fine spherical nanoparticles, especially at large concentrations of dopants (Cu0.94Mn0.015Fe0.015Co0.015Ni0.015O sample). The tetra-doping by (Mn, Fe, Co, Ni) ions reduced the intensity of the diffuse reflectance alongside red shifted the absorption edge and the band gap energy of monoclinic CuO structure. Cu0.98Mn0.005Fe0.005Co0.005Ni0.005O exhibits a high relative permittivity value of 6096 at low frequency of 42 Hz with small dielectric loss tangent (tan δ) compared to pure one. The tetra-doping by (Mn, Fe, Co, Ni) dopants induced excellent intrinsic ferromagnetic and superparamagnetic hysteresis loops into monoclinic CuO structure with full saturation loops shape and variable coercivity values.

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Section: Electrical Modulus Analysismentioning

confidence: 98%

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Youssef

Yakout

2023

J Mater Sci: Mater Electron

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“…The ZnO thin films can be easily nanostructured by different techniques like magnetron sputtering, [ 11 ] thermal evaporation, [ 12 ] sol‐gel, [ 13 ] chemical vapor deposition (CVD), [ 14 ] hydrothermal, [ 15 ] and spray pyrolysis technique, used in this work due to its simplicity, low cost and non‐vacuum deposition method allowing the reproducibility of reliable and uniform films of metal, oxide, and semiconductor. [ 16 ]…”

Section: Introductionmentioning

confidence: 99%

“…[8] However, recombination can be relatively avoided by separating, trapping, and transferring charges to intermediate energy levels as structural and surface defects. [9,10] The ZnO thin films can be easily nanostructured by different techniques like magnetron sputtering, [11] thermal evaporation, [12] sol-gel, [13] chemical vapor deposition (CVD), [14] hydrothermal, [15] and spray pyrolysis technique, used in this work due to its simplicity, low cost and non-vacuum deposition method allowing the reproducibility of reliable and uniform films of metal, oxide, and semiconductor. [16] In this study, the modification of physical properties by varying the deposition temperature was targeted to enhance the photodegradation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deposition Temperature on Morphological, Optical, and Photocatalytic Properties of ZnO Thin Films Synthesized by Ultrasonic Spray Pyrolysis Method

Ouhaibi

Saoula

Ghamnia

et al. 2022

Crystal Research and Technology

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ZnO thin films are synthesized by an ultrasonic spray pyrolysis method, with the deposition temperature in a range between 250–450 °C. The obtained thin films are analyzed by X‐ray diffraction (XRD), atomic force microscopy (AFM), and photoluminescence (PL). The samples are used in a photocatalytic experiment to compare the degradation efficiency by methylene blue decomposition under UV irradiation. XRD patterns confirm a polycristalline wurtzite structure with preferred orientation along the (002) plane. AFM images reveal an important change in the shape and size of the grains constituting the surface. The roughness values are in the range of 17–93 nm. Thickness values of thin films deposited at 250, 350, and 450 °C are ≈0.9, 2.3, and 1.4 µ, respectively. From PL characterization, the spectra are found to be sensitive to the deposition temperature, where emission peaks with different forms and intensities are observed. One peak at 389 nm is attributed to the recombination of free excitons, and other peaks between 403–522 nm correspond to violet, blue, and green emissions indicating the presence of Zn vacancies, Zn interstitials, and oxygen vacancies, respectively, in the ZnO structure. The photocatlytic results show that the best photocatalytic efficiency of 88% is achieved by ZnO thin film deposited at 450 °C.

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Synthesis and Characterization of Zn(1−x)Ni(x=0.01–0.03)O Nanofilms Under Specific Conditions: Enhancement of Red Emission, and Photodegradation Retarding Behavior

Ouhaibi,

Messaid,

Serhane

et al. 2024

Springer Proceedings in Materials

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Structural and electrical properties of sol–gel grown nanostructured ZnO and LaMnO3 particle-based nanocomposites

Cited by 16 publications

References 65 publications

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

High dielectric-energy storage and ferromagnetic-superparamagnetic properties: tetra-doping CuO nanocompositions

Effect of Deposition Temperature on Morphological, Optical, and Photocatalytic Properties of ZnO Thin Films Synthesized by Ultrasonic Spray Pyrolysis Method

Synthesis and Characterization of Zn(1−x)Ni(x=0.01–0.03)O Nanofilms Under Specific Conditions: Enhancement of Red Emission, and Photodegradation Retarding Behavior

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