Chemistry Reference
In-Depth Information
The water/alcohol/surfactant solvothermal method developed
by Li
nanocrystals with
predictable size, shape, and phase structure, by using RE(NO
et al
. can also be applied to prepare NaREF
4
)
, NaF,
3
3
NaOH, C
OH, and oleic acid as the starting materials [105-108]. The
NaF concentration, rare earth concentration, synthesis temperature,
and time govern the size, shape, and phase of NaREF
H
2
5
nanocrystals.
With the assistance of other surfactants such as CTAB and EDTA,
more novel NaYF
4
nanostructures could be prepared (Fig. 1.10).
4
:Eu
3+
nanorods, (b) NaYF
:Tb
3+
Figure 1.10
TEM image of (a) NaYF
4
4
nanocrystals, (c) NaYF
:Tb
3+
nanorods, and (d) NaYF
:Yb
3+
,Er
3+
4
4
nanorods.
Zhao
et al
. adopted the solvothermal method to prepare NaYF
4
nanostructured arrays using NaF, R(NO
, and oleic acid [109]. A
reverse micelle dissolution-reconstruction process was proposed
to interpret the chemical mechanism. They also fabricated uniform
β
)
3
3
nanotubes through a hydrothermal in situ ion-exchange
reaction by rare earth hydroxide precursors (Fig. 1.11) [110].
-NaRF
4
Haase
et al
. prepared nanoparticles and nanofibers of LaPO
with
4
3+
3+
3+
Eu
dopant ions [111]. The hydrothermal reaction
was carried out at a temperature of 200
, Ce
, and Tb
°
C with basic solution of pH
10
−
12. Similar approach can also give YVO
nanoparticles doped
4
with Eu, Sm, and Dy [112, 113]. Yan
et al
. reported the general
