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(a) (b)
(c)
Figure 2.24
(a, b) SEM images of arrays of hexagonal nanotubes, (c) arrays
of flower-patterned hexagonal disks of β-NaYF
[113].
4
Figure 2.25
Schematic of the formation of arrays of nanocrystals of α-NaYF
4
and β-NaYF
4
[113].
2.3.6
Complex Rare Earth Nanostructures
In addition to the 0-2D, core-shell, and hollow rare earth
nanostructures, some complex nanostructures such as
mesostructures, flower-like nanostructures, and superstructures
have been reported.
. [114] reported ceria nanoflower by thermally
decomposing (NH
Yan
et
al
precursor in oleic acid and oleylamine
as high boiling solvent at temperature 230-300°C. NO
)
Ce(NO
)
4
2
3
6
3
−
ions were
