X-ray diffraction line profile analysis of nanostructured nickel oxide: Shape factor and convolution of crystallite size and microstrain contributions

Maniammal, K.; Madhu, Gaurav; Biju, Vasudevanpillai

doi:10.1016/j.physe.2016.08.035

Cited by 123 publications

(62 citation statements)

References 51 publications

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“…The latter numbers were calculated according to the Scherrer equation: D c = kλ/βcosθ, where β is the full width at the half maximum of the diffraction peak, k is the empirical constant (0.9), θ is the angular position of the diffraction peak, and λ is the wavelength of the X-ray source (here 1.5405 Å). The observed increase of crystallite sizes with the increase of the annealing temperature was in agreement with the findings of others reported for inorganic semiconductors (e.g., nickel oxide) [37].…”

Section: Nial2o4supporting

confidence: 93%

“…Water 2019, 11, x FOR PEER REVIEW 5 of 15 the diffraction peak, k is the empirical constant (0.9), θ is the angular position of the diffraction peak, and λ is the wavelength of the X-ray source (here 1.5405 Å). The observed increase of crystallite sizes with the increase of the annealing temperature was in agreement with the findings of others reported for inorganic semiconductors (e.g., nickel oxide) [37]. ATR-FTIR spectroscopy studies were undertaken to confirm the purity of nickel aluminate nanoparticles and to investigate the presence of the functional groups on their surface.…”

Section: Nial2o4supporting

confidence: 90%

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Pristine and Graphene-Quantum-Dots-Decorated Spinel Nickel Aluminate for Water Remediation from Dyes and Toxic Pollutants

Regulska

Breczko

Basa

2019

Water

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Pristine nickel aluminate and the one decorated with graphene quantum dots were prepared via a cost-effective co-precipitation method. Both were fully characterized by thermogravimetry (TGA), differential scanning calorimetry (DSC), attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectroscopy, transmission electron microscopy (TEM), and UV–Vis techniques. The photocatalytic activity of nickel aluminate under simulated solar light irradiation was demonstrated towards potential pollutants, including a series of dyes (rhodamine B, quinoline yellow, eriochrome black T, methylene blue), toxic phenol and fungicide (thiram). Further profound enhancement of the photocatalytic activity of nickel aluminate was achieved after its decoration with graphene quantum dots. The mechanism of the photocatalytic degradation in the presence of the NiAl2O4/graphene quantum dots (GQDs) composite was investigated; hydroxyl radicals were found to play the leading role. This work offers new insight into the application of the conjunction of the inorganic spinel and the carbon nanostructure (i.e., GQDs), but also provides a simple and highly efficient route for potential water remediation from common pollutants, including dyes and colorless harmful substances.

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Section: Nial2o4supporting

confidence: 93%

Section: Nial2o4supporting

confidence: 90%

Pristine and Graphene-Quantum-Dots-Decorated Spinel Nickel Aluminate for Water Remediation from Dyes and Toxic Pollutants

Regulska

Breczko

Basa

2019

Water

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show abstract

“…Typically, the microstrain decreases with increasing crystallite size. [14][15][16] Herein, the evolution of the microstrain displayed a maximum for the H 2 300 C catalyst, while the mean crystallite size (structural coherence length) increased monotonically with annealing temperature starting from the as-prepared sample. Thus, up to 300 C annealing temperature, the microstrain and coherence length of the nanooctahedra exhibited an unusual positive correlation; in other words, the nanoparticles of H 2 200 C and H 2 300 C exhibited more local disorder than that expected from their size.…”

Section: Resultsmentioning

confidence: 96%

Concave curvature facets benefit oxygen electroreduction catalysis on octahedral shaped PtNi nanocatalysts

et al. 2019

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“…However, the Williamson-Hall analysis provides physically meaningless results for the system evaluated in this study. Other methods that incorporate the anisotropic nature of the crystal could be applied in order to extract this desired information, 55 but this is beyond the scope of this work. Thus, the influence of the microstrain was evaluated qualitatively applying the data of the Rietveld refinement and the results are presented in Figure 6.…”

Section: Microstrain Analysismentioning

confidence: 99%

Experimental and Theoretical Study of LiMn2O4 Synthesized by the Solution Combustion Method Using Corn Starch as Fuel

Siqueira

Machado

Quattrociocchi

et al. 2020

J. Braz. Chem. Soc.

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Lithium manganese oxide, LiMn 2 O 4 , was synthesized in two temperature stages, where the first consisted by an ecofriendly solution combustion method at 300 °C. Finally, the as-burned powders were thermal treated at 500 and 700 °C. The structural and morphological changes were evaluated by the Rietveld method and density functional theory (DFT) calculations. The Rietveld refinement indicates obtaining the spinel cubic phase LiMn 2 O 4 and a small amount of Mn 2 O 3 . The analyses by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show a porous microstructure composed of nano-sized crystallites for the sample treated at 500 °C. In cyclic voltammetry, it was possible to observe that the reduction-oxidation reaction is reversible due to the shape of voltammograms and the anodic and cathodic peaks of Mn ions. The theoretical calculations considered the experimental crystallographic parameters. The unit cell volume change was evaluated according to distinct amounts of lithium ions in the structure. The removal of the Li + cations from the oxides promotes a volume contraction. Therefore, it was possible to evaluate the participation of the Mn 3+ ions in the frontier region between the valence and conduction bands. The density of states (DOS) calculation shows a predominant contribution of the O 2p and Mn 3d orbitals in the frontier orbitals.

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X-ray diffraction line profile analysis of nanostructured nickel oxide: Shape factor and convolution of crystallite size and microstrain contributions

Cited by 123 publications

References 51 publications

Pristine and Graphene-Quantum-Dots-Decorated Spinel Nickel Aluminate for Water Remediation from Dyes and Toxic Pollutants

Pristine and Graphene-Quantum-Dots-Decorated Spinel Nickel Aluminate for Water Remediation from Dyes and Toxic Pollutants

Concave curvature facets benefit oxygen electroreduction catalysis on octahedral shaped PtNi nanocatalysts

Experimental and Theoretical Study of LiMn2O4 Synthesized by the Solution Combustion Method Using Corn Starch as Fuel

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