Size Control of Nearly Monodisperse beta-NaGdF4 Particles Prepared from Small alpha-NaGdF4 Nanocrystals

Autor(en): Duehnen, Simon
Rinkel, Thorben
Haase, Markus 
Stichwörter: Chemistry; Chemistry, Physical; DELIVERY; EMISSION; GROWTH; INFRARED DOWNCONVERSION PHOTOLUMINESCENCE; LAYER; Materials Science; Materials Science, Multidisciplinary; MECHANISM; NAGDF4 NANOPARTICLES; PROBES; ULTRASMALL; UPCONVERTING NANOPARTICLES
Erscheinungsdatum: 2015
Herausgeber: AMER CHEMICAL SOC
Journal: CHEMISTRY OF MATERIALS
Volumen: 27
Ausgabe: 11
Startseite: 4033
Seitenende: 4039
Zusammenfassung: 
NaGdF4 nanocrystals of the hexagonal beta-phase can be prepared with very narrow size distribution from small particles of the cubic alpha-phase of NaGdF4, but until now, this method does not allow to control the final particle size. Here we show that the size of beta-NaGdF4 particles can be varied between 4 nm and more than 60 nm by using small alpha-phase particles with different sodium content as precursor. Heating of the 34 nm alpha-phase particles dispersed in oleic acid/octadecene solvent leads to Ostwald-ripening and the formation of beta-NaGdF4 particles with narrow size distribution in all cases. The size of the beta-NaGdF4 particles increases with increasing sodium deficiency of the alpha-phase particles indicating that the number of beta-phase seeds nucleating in the system depends on the ratio of sodium to gadolinium used in the synthesis of the alpha-phase material.
ISSN: 08974756
DOI: 10.1021/acs.chemmater.5b01013

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