A1 Refereed original research article in a scientific journal
Highly uniform up-converting nanoparticles: Why you should control your synthesis even more
Authors: Emilia Palo, Minnea Tuomisto, Iko Hyppänen, Hendrik C. Swart, Jorma Hölsä, Tero Soukka, Mika Lastusaari
Publisher: ELSEVIER SCIENCE BV
Publication year: 2017
Journal: Journal of Luminescence
Journal name in source: JOURNAL OF LUMINESCENCE
Journal acronym: J LUMIN
Volume: 185
First page : 125
Last page: 131
Number of pages: 7
ISSN: 0022-2313
eISSN: 1872-7883
DOI: https://doi.org/10.1016/j.jlumin.2016.12.051
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/20518455
Luminescent beta-NaYF4:Yb3+,Er3+ (X-Yb: 0.17, X-Er: 0.03) nanomaterials were synthesized for use as labels for biomedical applications with high temperature co-precipitation synthesis in 1-octadecene and oleic acid. The effect of the synthesis conditions (e.g. argon flow, cooling and stirring rates) on the products' up-conversion luminescence intensity, particle size and morphology were studied. The factors contributing to these properties were analysed. It was Observed that an efficient inert gas flow is essential to the formation of the preferred highly-luminescent hexagonal structure. Furthermore, the flow rate, together with the stirring rate, crucially affect the Er:Yb molar ratio of the products. The optimization of this ratio is essential when strong up-conversion emission is required from small particles, whereas the morphology and uniformity of the nanoparticles can be controlled with the cooling rate. These results emphasize the importance of controlling the synthesis conditions, especially when nanoparticles need to have a specific morphology because of their use e.g. as luminescent labels in medical diagnostics. (C) 2017 Elsevier B.V. All rights reserved.
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