Synthesis and Characterization of Er-Doped Nano ZnO Samples

Farhat, S.; Rekaby, M.; Awad, R.

doi:10.1007/s10948-017-4548-9

Cited by 33 publications

(12 citation statements)

References 53 publications

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“…This may be due to the crystallite degradation with more sonication (Kashani-Motlagh et al, 2009). Similar conclusion was achieved by Farhat et al that confirmed that the energy gap and the crystallite size are inversely proportional (Farhat, Rekaby, & Awad, 2018). The Urbach energy or the absorption band tail is the result of the extended localized states in the band gap.…”

Section: Nanoparticles' Characterizationsupporting

confidence: 72%

Preparation, Characterization, and Application of Nickel Oxide Nanoparticles in Glucose and Lactose Biosensors

Abdallah¹,

Basma²,

Awad³

2019

MAS

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Nickel oxide (NiO) nanoparticles were synthesized using the co-precipitation method. The structural, morphological, optical and magnetic properties of NiO nanoparticles were investigated by X-ray Powder Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), UV-vis Spectroscopy and Vibrating Sample Magnetometer (VSM). The influence of sonication time on the physical characteristics of NiO nanoparticles was illustrated. The interactions of NiO nanoparticles with both glucose and lactose have been0 studied using UV-vis Absorption Spectroscopy and Fluorescence Spectroscopy. XRD pattern reveals that NiO nanoparticles exhibit a face-centered-cubic lattice structure with a crystallite size of 22.77 nm. The magnetic hysteresis demonstrates the ferromagnetic behavior of NiO nanoparticles at room temperature. The energy band gap increases, from 2.8 eV to 3.1 eV, with increasing sonication time from 5 to 20 minutes. It is found that the interaction of lactose-NiO nanoparticles is stronger than that of glucose-NiO ones. The obtained results can be investigated in future biomedical applications, especially in non-enzymatic biosensors.

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Section: Nanoparticles' Characterizationsupporting

confidence: 72%

Preparation, Characterization, and Application of Nickel Oxide Nanoparticles in Glucose and Lactose Biosensors

Abdallah¹,

Basma²,

Awad³

2019

MAS

Self Cite

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“…Also, the use of semiconductor materials in modern applications as computer and photovoltaic production led to fully open research in the field of materials science [6][7][8][9][10]. Among the II-VI semiconductor compounds, ZnO is denoted by broad direct band gap energy, large exciton binding energy (60 meV) and high transmission in the visible zone [6,[11][12][13][14][15][16]. Owing to these characteristics, ZnO nanoparticles play an essential role in different applications [17,18].…”

Section: Introductionmentioning

confidence: 99%

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

Badreddine

Srour

Awad

et al. 2020

Mater. Res. Express

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Zn1−xSmxO nanoparticles, with 0.00 ≤ x ≤ 0.10, were prepared using chemical co-precipitation method. The structure and morphology of the obtained samples were characterized using x-ray powder diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), respectively. However, the mechanical properties were investigated via digital Vickers microhardness tester. Vickers microhardness measurements were carried out at different applied loads, varying between 0.5 and 10 N at dwell time 60 s on pressed discs of average thickness 3 mm. Hv decreased as the Sm-content increased up to 0.02 and then it increased for higher concentrations. Whereas, it increased as the applied load increased, revealing that the samples exhibited a reverse indentation size effect (ISE). The microhardness measurements were interpreted using various models such as Meyer’s law, Hays and Kendall (HK) approach, elastic/plastic deformation (EPD), proportional specimen resistance (PSR) and the indentation-induced cracking (IIC). Mechanical parameters such as Young’s modulus (E), yield strength (Y), fracture toughness (K) and brittleness index (B) were calculated as a function of x. The most adequate model for the true microhardness of these samples is IIC. It was found that the addition of Sm content enhanced the mechanical properties of the prepared samples after x = 0.02. Dielectric measurements were used to compute different parameters such as real and imaginary parts of the complex permittivity, dielectric loss (tan δ) and ac conductivity (σ ac).

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“…The solubility limit for Er ions in Er-doped ZnO has been reported to be around 5-6 at%, depending on the synthesis conditions. [29,30] Above this limit a secondary phase of Er 2 O 3 [29] or the formation of Er clusters [30] have been observed. As a ballistic process, ion implantation also leads to some compositional and structural changes of the ZnO samples, especially at the regions of the crystal where the concentration of Er ions exceeds the solubility limit.…”

Section: Discussionmentioning

confidence: 96%

“…The solubility limit for Er ions in Er‐doped ZnO has been reported to be around 5–6 at%, depending on the synthesis conditions . Above this limit a secondary phase of Er 2 O 3 or the formation of Er clusters have been observed.…”

Section: Discussionmentioning

confidence: 99%

RBS/C, XRR, and XRD Studies of Damage Buildup in Er‐Implanted ZnO

Jozwik

Magalhães

Ratajczak

et al. 2018

Physica Status Solidi (b)

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Accumulation and transformation of defects formed in bulk ZnO crystals at room temperature upon 300 keV Er ions bombardment have been thoroughly examined using complementary techniques: Rutherford Backscattering Spectrometry in ion Channeling mode (RBS/C), X‐Ray Reflectivity (XRR), and X‐Ray Diffraction (XRD). Evaluation of RBS/C spectra has been performed using Monte Carlo (MC) simulations (McChasy software). Two defect types have been indicated: point defects (randomly displaced atoms, RDA) and extended ones (edge dislocations, DIS). Depth‐distributions of RDA and DIS turned out to be shifted toward deeper regions of ZnO crystals (relative to Er‐ions range) while DIS are localized even deeper than RDA. The MC simulations reveal three regions of defects accumulation separated by two regions of rapid defects transformation occurring at a certain critical Er fluence. Strain, suggested to be a driving force of defect transformation, has been determined using simulations of the XRD profiles based on the dynamical theory of X‐ray diffraction (MROX software). The presented research can help to better understand the interaction between impurity Er ions and ZnO target atoms during the implantation process. Hence, implantation conditions, for example, for luminescence purpose may now be more efficiently chosen based on the results discussed.

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Synthesis and Characterization of Er-Doped Nano ZnO Samples

Cited by 33 publications

References 53 publications

Preparation, Characterization, and Application of Nickel Oxide Nanoparticles in Glucose and Lactose Biosensors

Preparation, Characterization, and Application of Nickel Oxide Nanoparticles in Glucose and Lactose Biosensors

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

RBS/C, XRR, and XRD Studies of Damage Buildup in Er‐Implanted ZnO

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