Influence of annealing temperature on the microstructure and dielectric properties of ZnO nanoparticles

Omri, K.; Najeh, I.; Mır, L. El

doi:10.1016/j.ceramint.2016.02.151

Cited by 109 publications

(21 citation statements)

References 29 publications

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“…The electrical characteristic of a material is exhibited by the appearance of semicircular arcs in Nyquist plots. Figure 13 shows the complex impedance plots (Nyquist plots) of pure and Ni-doped ZnO nanoparticles and similar behaviour is given by Cherifi et al [44] and Omri et al [48]. It has been reported in literature that the resistivity of a polycrystalline material, in general, increases with the decrease in grain size.…”

Section: Dielectric Propertiessupporting

confidence: 79%

Structural, morphological, magnetic and electrical properties of Ni-doped ZnO nanoparticles synthesized by co-precipitation method

Dasari

Godavarti

Mote³

2018

PAC

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Weak ferromagnetic behaviour was obtained in a systematic way at room temperature by doping of where x = 0.00, 0.05, 0.15 and 0.20). The obtained results were correlated with conductivity and impedance studies. Diamagnetic to ferromagnetic change was observed with increased concentration of nickel. X-ray diffraction analysis confirmed wurtzite ZnO structure of prepared nanopowders while microstrain was increased with nickel concentration. Incorporation of nickel in ZnO structure was confirmed using EDAX analysis, while FTIR spectroscopy provided further information on functional groups. Transmission electron microscopy images showed that the particle sizes are in the range of 12-20 nm, and scanning electron microscopy analyses that grain size decreases with increase in nickel concentration. Photo luminescence studies confirmed the presence of V O and Zn i defects in the prepared samples. It was concluded that the defect induced strain, grain boundaries and lower particle sizes are the reasons for weak ferromagnetic behaviour of the investigated samples.

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Section: Dielectric Propertiessupporting

confidence: 79%

Structural, morphological, magnetic and electrical properties of Ni-doped ZnO nanoparticles synthesized by co-precipitation method

Dasari

Godavarti

Mote³

2018

PAC

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“…them distinct from their corresponding bulk size material 3 . The NPs have been utilized in the preparation of drugs, detection of protein and pathogens, treatment of different cancers, separation and purification of biological molecules and cells 4 .…”

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confidence: 95%

Anticandidal and In vitro Anti-Proliferative Activity of Sonochemically synthesized Indium Tin Oxide Nanoparticles

Rehman

Asiri

Khan

et al. 2020

Sci Rep

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The present work demonstrates the synthesis, characterization and biological activities of different concentrations of tin doped indium oxide nanoparticles (Sn doped in 2 o 3 nps), i.e., (Sn/in = 5%, 10% and 15%). We have synthesized different size (38.11 nm, 18.46 nm and 10.21 nm) of Sn doped In 2 o 3 nps. by using an ultra-sonication process. the Sn doped in 2 o 3 nps were characterized by by x-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) which confirmed the successful doping of tin (Sn) with Indium oxide (In 2 o 3). Anticandidal activity was performed by standard agar dilution method using Candida albicans for the study. the minimum inhibitory/fungicidal concentration (MIC/MFC) values recorded were, 8 & >8 mg/ml for pure In 2 o 3 NPs, 4 & 8 mg/ml for 5%, 2 & 8 mg/ml for 10%, whereas 1 & >4 mg/ml for 15% Sn doped In 2 o 3 nps, respectively. the topographical alteration caused by Sn doped in 2 o 3 nps on Candida cells, was clearly observed by SEM examination. A significant enhancement in anticandidal activity was seen, when Candida cells were exposed to (Sn/in = 5%, 10% and 15%). Moreover, we have also evaluated the impact of Sn-in 2 o 3 NPs on human colorectal carcinoma cells (HCT-116). The results demonstrated that Sn-in 2 o 3 nps (Sn/in = 5%, 10% and 15%), caused dose dependent decrease in the cancer cell viability as the low dosage (2.0 mg/mL) showed 62.11% cell viability, while 4.0, 8.0, 16.0, 32.0 mg/mL dosages showed 20.45%, 18.25%, 16.58%, and 15.58% cell viability. In addition, the treatment of Sn-In 2 o 3 nps also showed significant cellular and anatomical changes in cancer cells as examined by microscopes. We have also examined the impact of Sn-In 2 o 3 NPs (5%, 10%, 15%) on normal cells (HEK-293) and the results demonstrate that Sn-in 2 o 3 nps did not reduce the cell viability of normal cells. The increasing population of world, raises new health challenges, and among them are the increased incidence of infectious diseases and cancer 1. It is a well-known fact, that fungal infections are an established threat in medicine these days. Among them, genus Candida, dominates by its prevalence and increasing influence on humans. Approximately, 50-60% of the hospital acquired infection is Candida infection called as candidemia, which is a bloodstream infection with high rates of morbidity and mortality 2. Such nosocomial infections are becoming a huge challenge, hence its necessary to develop new antibiotic therapeutics, especially based on nanoparticles (NPs). In recent years, metal oxide NPs have been studied broadly for their alluring characteristics, which makes

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“…Nanocrystalline materials such as metals oxides [1][2][3], magnetite [4,5], and spinel ferrites [6][7][8][9][10] have enormous structures and suitable dielectric and magnetic properties for intelligent applications. Over the last decade, spinel ferrites attracted much attention due to their unique structural, elastic, dielectric and magnetic properties [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Maksoud

Elghandour

El-Sayyad

et al. 2020

J Inorg Organomet Polym

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This work reports the detailed structural characterization of Zn 2+ ion-substituted cobalt ferrite nanoparticles (CFO NPs; Co 1−x Zn x Fe 2 O 4 ; x = 0.00, 0.25, 0.50, and 0.75), prepared using a facile sol-gel method. It correlates structural changes with magnetic and dielectric properties. The as-synthesized samples were investigated by X-ray diffraction (XRD) analysis, BET surface area analyzer, energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Mössbauer spectroscopy, and impedance analyzer. The pristine sample (CFO) comprised of NPs with 25 nm size, which decreased up to 11 nm upon the formation of Zn 0.75 Co 0.25 Fe 2 O 4 . The N 2 adsorption-desorption isotherm of the prepared Zn 0.5 Co 0.5 Fe 2 O 4 sample confirmed the presence of a mesoporous structure. SEM images revealed that all prepared samples exhibited porous surface with honeycomb-like structures. The cationic distribution was described by Mössbauer spectra. The increment of Zn ions in the prepared samples resulted in sharp reduction of saturation magnetization and remanence values. The normal dielectric dispersion behavior was recorded and can be ascribed to the Maxwell-Wagner type polarization. Besides, the dielectric parameters varied by increasing Zn content in CFO NPs. This may be ascribed to O 2 vacancies and Fe 3+ ions in A-and B-sites. Dielectric studies revealed that, content of Zn ions beyond x = 0.25 was sufficient to reduce both dielectric constant and loss at low frequencies.

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Influence of annealing temperature on the microstructure and dielectric properties of ZnO nanoparticles

Cited by 109 publications

References 29 publications

Structural, morphological, magnetic and electrical properties of Ni-doped ZnO nanoparticles synthesized by co-precipitation method

Structural, morphological, magnetic and electrical properties of Ni-doped ZnO nanoparticles synthesized by co-precipitation method

Anticandidal and In vitro Anti-Proliferative Activity of Sonochemically synthesized Indium Tin Oxide Nanoparticles

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

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