Investigation of the Early Stages of Growth of Monazite-Type Lanthanide Phosphate Nanoparticles

Autor(en): Hickmann, Katharina
John, Vanessa
Oertel, Anke
Koempe, Karsten
Haase, Markus 
Stichwörter: ABSORPTION-SPECTROSCOPY; CERIUM PHOSPHATE; Chemistry; Chemistry, Physical; GEL-SOL METHOD; IN-SITU OBSERVATION; LAPO4-CE,TB; LUMINESCENCE; Materials Science; Materials Science, Multidisciplinary; NANOCRYSTALS; NANOMATERIALS; Nanoscience & Nanotechnology; PARTICLES; Science & Technology - Other Topics; UP-CONVERSION
Erscheinungsdatum: 2009
Herausgeber: AMER CHEMICAL SOC
Journal: JOURNAL OF PHYSICAL CHEMISTRY C
Volumen: 113
Ausgabe: 12
Startseite: 4763
Seitenende: 4767
Zusammenfassung: 
The growth of NdPO4 nanocrystals in diphenyl ether based reaction medium has been monitored by optical spectroscopy. Since the crystal field splitting and the intensity of the Nd3+ f-f transitions are affected by the coordination of the Nd3+ ions, different stages of the growth of NdPO4 nanocrystals can be distinguished by UV-visible absorption spectroscopy. It is found that a first reaction in homogeneous solution occurs already at room temperature when the phosphate-containing precursor solution is combined with the solution of the molecular Nd3+ precursor. Our results clearly indicate that a sol of NdPO4 nanoparticles with a mean particle diameter below 3 run is thereby formed as the first product. Upon heating to 200 degrees C, this first product undergoes a complex sol-gel-sol transition, leading to a colloidal solution of 4-5 nm diameter NdPO4 nanocrystals. Further heating at 200 degrees C leads to annealing of the nanocrystalline lattice, but not to further particle growth if the amine concentration is sufficiently high.
ISSN: 19327447
DOI: 10.1021/jp808933f

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