Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

P, Ranjith Kumar; Prasad, Neena; Veillon, Fabien; Prellier, W.

doi:10.1016/j.jallcom.2020.157639

Cited by 28 publications

(17 citation statements)

References 64 publications

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“…It is believed that the absence of the magnon peak in the observed Raman measurements indicates that the material has undergone a superparamagnetic transition, which is excellent agreement with the existing report. [60] The observed characteristic phonon mode of vibrations of intrinsic NiO nanoparticles corresponds closely to the measured Raman active mode. Thus, the phase purity of the green synthesized NiO nanoparticles can be determined by Raman spectral analysis.…”

Section: Raman Spectroscopy Analysissupporting

confidence: 70%

“…The four peaks in the spectrum of the green‐synthesised NiO nanoparticles correspond to the face‐centered cubic NiO nanoparticles′ characteristic Raman mode vibrations. In more detail, the Raman bands observed at 1228, 1045, 837, and 492 cm −1 are associated with the vibrational origin of 2P longitudinal optical (LO), 2LO, 2P surface optical (SO), and 1P LO modes, respectively [60] . The Magnon peak, typically observed at 1500 cm −1 , was not present in the Raman spectrum.…”

Section: Resultsmentioning

confidence: 92%

“…In more detail, the Raman bands observed at 1228, 1045, 837, and 492 cm À 1 are associated with the vibrational origin of 2P longitudinal optical (LO), 2LO, 2P surface optical (SO), and 1P LO modes, respectively. [60] The Magnon peak, typically observed at 1500 cm À 1 , was not present in the Raman spectrum. It is believed that the absence of the magnon peak in the observed Raman measurements indicates that the material has undergone a superparamagnetic transition, which is excellent agreement with the existing report.…”

Section: Raman Spectroscopy Analysismentioning

confidence: 94%

See 2 more Smart Citations

Electrochemical Detection of 4‐Nitrophenol Using A Screen‐Printed Carbon Electrode Modified by Rod‐Shaped Nickel Oxide Nanoparticles

et al. 2023

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4-Nitrophenol (4-NP) is a hazardous organic pollutant with detrimental effects on plants, animals, and humans. Detection of 4-NP in the environment is therefore a necessary requirement. We demonstrate a facile green synthesis of nickel-oxide (NiO) nanoparticles employing Brassica oleracea vegetable extract (cauliflower) as a green stabilizing and reducing agent. Green synthesized NiO nanoparticles were used as an efficient electrode material for the highly sensitive electrochemical detection of 4-NP. The abundant polyphenolic component in the vegetable extract of Brassica oleracea is capable of reducing and stabilizing C 2 NiO 4 into NiO nanoparticles. The as-synthesized NiO nanoparticles were characterized by UV-Vis spectroscopy, FTIR spectroscopy, Raman spectroscopy, photolumines-cence spectroscopy, and X-ray photoelectron spectroscopy (XPS), and the structural phase of NiO nanoparticles was confirmed using powder X-ray diffraction technique. The surface morphology of the NiO nanoparticles was analyzed using scanning electron microscopy (SEM). Linear sweep voltammetry (LSV) and Differential pulse voltammetry (DPV) techniques were adopted to for the electrochemical determination of 4-NP after drop casting the NiO nanoparticles onto the screen-printed carbon electrode (SPCE). The developed sensor (NiO/SPCE) showed a high sensitivity of 1.055 μA/nM over a wide linearrange from 1 to 10 nM with a detection limit of 0.519 nM for the detection of 4-NP using DPV technique.

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Section: Raman Spectroscopy Analysissupporting

confidence: 70%

Section: Resultsmentioning

confidence: 92%

Section: Raman Spectroscopy Analysismentioning

confidence: 94%

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Electrochemical Detection of 4‐Nitrophenol Using A Screen‐Printed Carbon Electrode Modified by Rod‐Shaped Nickel Oxide Nanoparticles

et al. 2023

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“…The Raman results of worn surfaces under different temperatures are shown in Figure 9. It can be noticed that under RT and 200 • C, due to the large removal of the Sb 2 O 3 -MSH/C layer in the friction process, the metal substrate is exposed to sliding causing formation of oxides as it is confirmed by the presence of various metal oxide Raman peaks, including iron oxide (323 cm −1 ) (de Faria et al, 1997), nickel oxides (476, 560 cm −1 ) (Nan et al, 2006;Kumar et al, 2020), and chromium oxides (680 cm −1 ) (Guinneton et al, 2005). Besides, the Sb 2 O 3 peak located at 190 cm −1 , a new peak at 255 cm −1 also appeared, though its intensity is weak.…”

Section: Resultsmentioning

confidence: 96%

Macroscale Superlubricity Accomplished by Sb2O3-MSH/C Under High Temperature

et al. 2021

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Here, we report the high-temperature superlubricity phenomenon accomplished in coatings produced by burnishing powders of antimony trioxide (Sb2O3) and magnesium silicate hydroxide coated with carbon (MSH/C) onto the nickel superalloy substrate. The tribological analysis performed in an open-air experimental setup revealed that with the increase of testing temperature, the coefficient of friction (COF) of the coating gradually decreases, finally reaching the superlubricity regime (the COF of 0.008) at 300°C. The analysis of worn surfaces using in-situ Raman spectroscopy suggested the synergistic effect of the inner Sb2O3 adhesion layer and the top MSH/C layer, which do not only isolate the substrate from the direct exposure to sliding but also protect it from oxidation. The cross-sectional transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) results indicated the tribochemically-activated formation of an amorphous carbon layer on the surface of the coating during sliding. Formation of the film enables the high-temperature macroscale superlubricity behavior of the material system.

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“…Rare earth cations can create new defects in the forbidden region of the band gap, modifying the electronic properties that reflect in the charge transfers process and, consequently, in the optical properties (Al Boukhari et al, 2020;Chu et al, 2020). In this way, Eu 3+ cations have a special role for obtaining efficient red phosphors, luminescent devices and lasers, for example, from the doping of several distinct semiconductor host matrices (P. Kumar et al, 2021;Mazzo et al, 2010;Ortega et al, 2019;Pinatti et al, 2015). The applications of Eu 3+ cations are mainly related to its nondegenerate 7 F0 ground state and nonoverlapping 2S+1 LJ multiplets (Targonska et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Luminescence and structural properties of Ca1-xZrO3:Eux: An experimental and theoretical approach

Assis¹,

Oliveira²,

Gouveia³

et al. 2022

Eclet. Quim. J.

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The influence of Eu3+ cations in the host matrix of CaZrO3 was investigated by analyzing its luminescence and structural properties. The Ca1-xZrO3:Eux crystals (x = 0.01, 0.02, 0.04, and 0.08 mol%) were obtained by a simple sol-gel method followed by a soft thermal treatment without any surfactant. The structural characterization was performed at short-, medium- and long-distance to verify the effect of the dopant in the host matrix. To endorse the experimental results, first-principles calculations were performed by using the CRYSTAL program associated with the density functional theory. The luminescence profile of the sample was investigated by analyzing the excitation and emission spectrum monitoring the emission at 614 nm and excited at 394 nm, noting that the sample Eu-doped with 0.08 mol% has greater emission intensity. The color variations of the characteristic emissions of Ca1-xZrO3:Eux crystals were evaluated according to the Commission Internationale de L'�clairage, observing a red shift for all Eu-doped samples. A general luminescence scheme was proposed combining the density of state and the band structure calculations.

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Raman spectroscopic and magnetic properties of Europium doped nickel oxide nanoparticles prepared by microwave-assisted hydrothermal method

Cited by 28 publications

References 64 publications

Electrochemical Detection of 4‐Nitrophenol Using A Screen‐Printed Carbon Electrode Modified by Rod‐Shaped Nickel Oxide Nanoparticles

Electrochemical Detection of 4‐Nitrophenol Using A Screen‐Printed Carbon Electrode Modified by Rod‐Shaped Nickel Oxide Nanoparticles

Macroscale Superlubricity Accomplished by Sb2O3-MSH/C Under High Temperature

Luminescence and structural properties of Ca1-xZrO3:Eux: An experimental and theoretical approach

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