Clear antiferromagnetism induced by vacancies in ZnO nanoparticles synthesized by alkali salt method

Ascencio, Francisco; Reyes-Damián, C.; Escudero, R.

doi:10.1007/s11051-022-05473-9

Cited by 2 publications

(2 citation statements)

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“…ZnO described by a hexagonal wurtzite-phase ZnO symmetry and point group C 6v displays the Γ = A 1 + 2B 1 + E 1 + 2E 2 vibrational modes of which only three (A 1 , E 1 , and E 2 ) are Raman active, while the remaining vibrational modes are within the IR region. A 1 and E 1 are polar modes and are split into transverse optical (TO) and longitudinal optical (LO) phonons, whereas E 2 modes (E 2Low and E 2High ) are nonpolar [34]. This last Raman peak is characteristic of the hexagonal wurtzite phase, and in some studies, it has been observed that the B1 Raman mode is inactive or silent [40,41] Figure 5(A) shows the Raman spectra for the different ZnO nanostructures, from NPs (6.74 nm) to nanorods (29.53 nm), with the average sizes taken from table 1.…”

Section: Electron Microscopy Characterizationmentioning

confidence: 99%

“…The magnetic behavior of ZnO NPs is under continuous research because of their dependency on the structural variations of the compound, presence of grain boundaries, second phases, crystalline defects, oxygen deficiencies, cation inclusions, or capping. Different reports associate ZnO NPs with different magnetic responses (ferromagnetic, antiferromagnetic, superparamagnetic, or diamagnetic) as a function of the synthesis conditions and morphology [2,3,[25][26][27][28][29][30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and optical properties of ZnO nanoparticles and nanorods synthesized by green chemistry

Reyes-Damián,

Álvarez-Chimal,

Ascencio

et al. 2024

Nano Ex.

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ZnO nanostructures have attracted considerable attention because of their physicochemical properties and applications as antibacterial agents, photocatalytic reactions for pollutant removal, and electronics. Hence, efficient production and knowledge of their properties under different synthesis conditions are essential. Biosynthesis has emerged as an excellent growth-directing method for synthesizing nanomaterials, representing a soft and cleaner alternative for their production. In this study, we synthesized different ZnO nanostructures using a soft chemistry method at different growth temperatures, from 200 to 800 °C every 200 °C. The crystalline structure was estudied by X-ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM). The shape and size were studied by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM), which revealed a ZnO hexagonal phase with two shapes: nanoparticles (NPs) with irregular shapes and nanorods of different sizes. The optical properties were studied by Raman and UV-visible spectroscopy, and optical absorption measurements showed bandgap tuning of the produced nanostructures. Finally, the magnetic characteristics of the samples demonstrated magnetic anisotropy due to the preference for crystalline formation and the size of the nanoparticles. The magnetic interaction between the two types of NPs increased the diamagnetism associated with the nanorods.

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Section: Electron Microscopy Characterizationmentioning

confidence: 99%