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. 2012 Mar;12(3):1886-91.
doi: 10.1166/jnn.2012.5202.

Optimisation of ligand exchange towards stable water suspensions of crystalline NaYF4: Er3+, Yb3+ nanoluminophors

D Wawrzynczyk  1 , A Bednarkiewicz, M Nyk, J Cichos, M Karbowiak, D Hreniak, W Strek, M Samoc
Affiliations

Optimisation of ligand exchange towards stable water suspensions of crystalline NaYF4: Er3+, Yb3+ nanoluminophors

D Wawrzynczyk et al. J Nanosci Nanotechnol. 2012 Mar.

Abstract

NaYF4: 2%Er3+, 20%Yb3+ nanoparticles were synthesized through a wet chemical route. In order to transfer the nanoparticles from chloroform to aqueous solution an oleic acid to 3-mercaptopropionic acid ligand exchange process has been performed and optimized. The influence of temperature and atmosphere onto the NaYF4:2%Er3+, 20%Yb3+ nanoparticles water suspensions dispersibility and stability after replacing oleic acid with 3-mercaptopropionic acid ligands has been investigated. The results revealed an improvement of nanoparticles water suspension transparency and luminescence yield after ligand exchange process performed under inert atmosphere and at elevated temperature.

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