Preparation of rare-earth doped NaYF4 luminescent nanoparticles by a high-energy ball milling processстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
Аннотация:A possible fabrication of photoluminescent fluoride nanoparticles NaYF4 doped with rare-earth ions employing high-energy ball milling is demonstrated. The melt-grown bulk cubic crystal Na0.40Y0.480Yb0.108-Er0.012F2.2 and composite Na0.55Y0.360Yb0.081Er0.009F2.10 comprising hexagonal β-NaYF4 modification were used as raw materials. The samples were analyzed using X-ray diffraction analysis, differential scanning calorimetry, transmission electron microscopy, and optical spectroscopy after the milling. Pure single phase NaYF4 was not obtained even after 14 hours of mechanochemical treatment of individual components. However, high-energy ball milling of the crystals in the presence of oleic acid as a surfactant for 16 hours allowed production of single-phase β-NaYF4:Yb,Er nanoparticles with an average size of 20–30 nm. The milled β-NaYF4:Yb,Er nanoparticles demonstrate intense green fluorescence upon excitation at λ = 980 nm and can potentially be used in biomedicine and nanophotonics. The optimized methodology of high-energy milling has great potential for scalable and reproducible production of β-NaYF4 nanoparticles for industrial and scientific applications. High-temperature X-ray diffraction confirmed the phase transformation of melt-grown α-NaYF4 crystals into the hexagonal β-modification both during mechanical (4 hours) and thermal treatment in the 653–823 K range. The long duration of the process precludes the possibilities of large scale preparation of the cubic α-NaYF4 by mechanical milling.