In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2010, No. 12 ( 2010-04), p. 1813-1819
Abstract:
The hexagonal‐phase NaYF 4 :Yb 3+ , Er 3+ hollow nanospheres (HNS) have been successfully prepared for the first time by means of a hydrothermal route with the aid of polyethylenimine (PEI) as a surfactant. The nitrogen adsorption/desorption isotherms demonstrated the porous nature of the NaYF 4 HNS. The formation mechanism was explored based on the effects of the reaction parameters. The NaYF 4 solid spheres underwent a dissolution‐recrystallisation transformation and a hollowing process when the hydrothermal reaction time was prolonged. The localised Ostwald ripening mechanism was proposed to account for the formation of NaYF 4 HNS, in which loose aggregations were found to be crucial. The upconversion luminescence of NaYF 4 :Yb 3+ , Er 3+ HNS was also investigated. It is expected that these NaYF 4 HNS might have potential in applications as building blocks for biolabels and drug‐delivery.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2010:12
DOI:
10.1002/ejic.200901119
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
1475009-0
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