Nanoscience and the Scherrer equation versus the ‘Scherrer–Gottingen equation’

Kroon, R.E.

doi:10.1590/sajs.2013/a0019

Cited by 50 publications

(21 citation statements)

References 11 publications

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“…Here, (β crystalline )values were estimated from the "Scherrer-Gottingen equation." (β crystalline ) can be calculated by considering Bragg reflections with diffraction angle (2θ) [24]:…”

Section: Characterizationmentioning

confidence: 99%

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO₂ Nanoparticles Induced by Low Calcination Temperature

Khaenamkaew

Manop

Tanghengjaroen

et al. 2020

Advances in Materials Science and Engineering

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The electrical properties of tin dioxide (SnO2) nanoparticles induced by low calcination temperature were systematically investigated for gas sensing applications. The precipitation method was used to prepare SnO2 powders, while the sol-gel method was adopted to prepare SnO2 thin films at different calcination temperatures. The characterization was done by X-ray diffraction, scanning electron microscopy (SEM), and atomic force microscopy (AFM). The samples were perfectly matched with the rutile tetragonal structure. The average crystallite sizes of SnO2 powders were 45 ± 2, 50 ± 2, 62 ± 2, and 65 ± 2 nm at calcination temperatures of 300, 350, 400, and 450°C, respectively. SEM images and AFM topographies showed an increase in particle size and roughness with the rise in calcination temperature. The dielectric constant decreased with the increase in the frequency of the applied signals but increased on increasing calcination temperature. By using the UV-Vis spectrum, the direct energy bandgaps of SnO2 thin films were found as 4.85, 4.80, 4.75, and 4.10 eV for 300, 350, 400, and 450°C, respectively. Low calcination temperature as 300°C allows smaller crystallite sizes and lower dielectric constants but increases the surface roughness of SnO2, while lattice strain remains independent. Thus, low calcination temperatures of SnO2 are promising for electronic devices like gas sensors.

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Section: Characterizationmentioning

confidence: 99%

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO₂ Nanoparticles Induced by Low Calcination Temperature

Khaenamkaew

Manop

Tanghengjaroen

et al. 2020

Advances in Materials Science and Engineering

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“…where, λ is the wavelength of the X-Ray sources, k (= 0.89) is the Scherrer constant, β is the experimental Full-Width at Half-Maximum (FWHM) of the respective diffraction peak (radians) and θ is the Bragg angles (Kroon, 2013). Fourier-Transform Infrared spectroscopy (FTIR) spectra were obtained using a Perkin Elmer Spectrm BX Spectrometer with Pike MIRacleTM ATR coupling (ZnSe crystal) ranging from 4000 to 520 cm 1 , with 4 cm 1 resolution and 10 scans per sample.…”

Section: Ch-fe3o4nps Synthesis and Characterizationmentioning

confidence: 99%

Assessment of the Toxic Effects of Chitosan-Coated Magnetite Nanoparticles on Drosophila melanogaster

Vela¹,

J²,

Cárdenas³

et al. 2020

American Journal of Applied Sciences

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Nanoparticles are a cause for concern because of their potential toxic effects on human health and the environment. The aim of this study was to assess the toxic effect of chitosan-coated magnetite nanoparticles (11.00±4.7 nm) on Drosophila melanogaster through the observation of hemolymph composition, DNA damage, larval survival and lifespan of flies. Chitosan-coated magnetite nanoparticles were synthesized by coprecipitation method. Drosophila larvaes and adults were exposed to 500 and 1000 ppm nanoparticles solution. After exposure, each type of larval hemocytes was recognized. Comet assay was performed to detect the DNA damage in the hemocytes. Also, the larval survival and lifespan of exposed flies were observed. Our results showed the toxic effect of the chitosan-coated magnetite nanoparticles through the increment of hemocytes, the emergence of lamellocytes, the presence of apoptotic hemocytes and the DNA damage detected by comet assay. In addition, nanoparticles produce decreasing of larval survival and shortening of the mean and maximum lifespan. The toxic effect the chitosan-coated magnetite nanoparticles is directly associated with 1000 ppm. No DNA damage was observed at 500 ppm.

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“…In the case of the doped samples, extra peaks indicated by asterisks (*) occurred at the expected angles of Au, very similar to the case of doped ZnO. The crystallite size for the TiO 2 host material was obtained by using the Scherrer equation [ 29 , 30 ] which gave a value of about 28 nm. For TiO 2 the width of the diffraction peaks become narrower when doped with Au.…”

Section: Resultsmentioning

confidence: 81%

Influence of Ag, Au and Pd noble metals doping on structural, optical and antimicrobial properties of zinc oxide and titanium dioxide nanomaterials

Pathak

Kroon

Crăciun

et al. 2019

Heliyon

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Oxide materials (ZnO, TiO2) doped with noble metals were synthesized using the combustion technique. The results of the addition of Ag, Au, and Pd up to a concentration of 2 mol% on the structural, optical, morphological and antimicrobial properties was considered. X-ray diffraction experiments revealed that the crystal structure of the host materials remained unaltered despite doping with noble metals. From the scanning electron microscopy results, it was evident that the doped nanoparticles aggregated in clusters of different sizes in the host matrix. The plasmonic effect was also observed in the absorbance spectra of the different doped materials. The obtained materials have shown promising antimicrobial features. All ZnO materials exhibited a high antimicrobial activity, with very low minimum inhibitory concentration values, against the planktonic growth of all tested Gram-positive and Gram-negative bacterial strains. All doped materials exhibited very good anti-biofilm activity, the lowest minimal biofilm eradication concentration values being registered for ZnO doped with Au and Pd toward Escherichia coli and for ZnO doped with Ag against Candida albicans. These results indicate the potential that these materials have for antimicrobial applications in the fields of biomedicine and environmental protection.

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Nanoscience and the Scherrer equation versus the ‘Scherrer–Gottingen equation’

Cited by 50 publications

References 11 publications

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO₂ Nanoparticles Induced by Low Calcination Temperature

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO₂ Nanoparticles Induced by Low Calcination Temperature

Assessment of the Toxic Effects of Chitosan-Coated Magnetite Nanoparticles on Drosophila melanogaster

Influence of Ag, Au and Pd noble metals doping on structural, optical and antimicrobial properties of zinc oxide and titanium dioxide nanomaterials

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Nanoscience and the Scherrer equation versus the ‘Scherrer–Gottingen equation’

Cited by 50 publications

References 11 publications

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO2 Nanoparticles Induced by Low Calcination Temperature

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO2 Nanoparticles Induced by Low Calcination Temperature

Assessment of the Toxic Effects of Chitosan-Coated Magnetite Nanoparticles on Drosophila melanogaster

Influence of Ag, Au and Pd noble metals doping on structural, optical and antimicrobial properties of zinc oxide and titanium dioxide nanomaterials

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Product

Resources

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Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO₂ Nanoparticles Induced by Low Calcination Temperature

Crystal Structure, Lattice Strain, Morphology, and Electrical Properties of SnO₂ Nanoparticles Induced by Low Calcination Temperature