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Monodisperse upconversion GdF3:Yb, Er rhombi by microwave-assisted synthesis.

Wang H, Nann T - Nanoscale Res Lett (2011)

Bottom Line: We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis.Typical upconversion emission from Er3+ was observed.In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute Materials for Electronics and Energy Technology (I-MEET), Friedrich Alexander Universität Erlangen-Nürnberg, Marternsstraße 7, 91058, Erlangen, Germany. wang.hai-qiao@ww.uni-erlangen.de.

ABSTRACT
We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis. Typical upconversion emission from Er3+ was observed. In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

No MeSH data available.


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TEM, XRD and SAED characterization of obtained samples. (A) TEM micrograph of GdF3 nanocrystals synthesized at five times the standard concentration. (B) LiF nanocrystals synthesized by traditional conductive heating at the same conditions like A. Inset: XRD pattern of the obtained nanocrystals. (C) XRD pattern of GdF3 nanocrystals synthesized at five times the standard concentration. Inset: SAED pattern of the prepared sample.
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Figure 4: TEM, XRD and SAED characterization of obtained samples. (A) TEM micrograph of GdF3 nanocrystals synthesized at five times the standard concentration. (B) LiF nanocrystals synthesized by traditional conductive heating at the same conditions like A. Inset: XRD pattern of the obtained nanocrystals. (C) XRD pattern of GdF3 nanocrystals synthesized at five times the standard concentration. Inset: SAED pattern of the prepared sample.

Mentions: When the concentration of reactants was increased by a factor of five, compared with the standard conditions, the nanocrystals were still predominantly rhombic in shape (in addition, some spherical particles were observed), but approximately 150 nm in length and 5 nm in thickness (cf. Figure 4A). This finding confirms further that the nanocrystals grow preferentially in two dimensions. Again, the XRD pattern is associated well with the orthorhombic phase GdF3, and without diffraction peaks of LiF any more (Figure 4C). Figure 4C inset shows the SAED pattern of this prepared sample. Figure 4B shows the TEM of the obtained nanocrystals that were prepared under identical conditions as the ones in Figure 4A, but using traditional conductive heating. Shape and size of these particles are roughly in the order of magnitude of the standard conditions described above. However, the XRD pattern (inset Figure 4B) of these nanocrystals shows that mainly cubic LiF nanocrystals have been synthesized.


Monodisperse upconversion GdF3:Yb, Er rhombi by microwave-assisted synthesis.

Wang H, Nann T - Nanoscale Res Lett (2011)

TEM, XRD and SAED characterization of obtained samples. (A) TEM micrograph of GdF3 nanocrystals synthesized at five times the standard concentration. (B) LiF nanocrystals synthesized by traditional conductive heating at the same conditions like A. Inset: XRD pattern of the obtained nanocrystals. (C) XRD pattern of GdF3 nanocrystals synthesized at five times the standard concentration. Inset: SAED pattern of the prepared sample.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211330&req=5

Figure 4: TEM, XRD and SAED characterization of obtained samples. (A) TEM micrograph of GdF3 nanocrystals synthesized at five times the standard concentration. (B) LiF nanocrystals synthesized by traditional conductive heating at the same conditions like A. Inset: XRD pattern of the obtained nanocrystals. (C) XRD pattern of GdF3 nanocrystals synthesized at five times the standard concentration. Inset: SAED pattern of the prepared sample.
Mentions: When the concentration of reactants was increased by a factor of five, compared with the standard conditions, the nanocrystals were still predominantly rhombic in shape (in addition, some spherical particles were observed), but approximately 150 nm in length and 5 nm in thickness (cf. Figure 4A). This finding confirms further that the nanocrystals grow preferentially in two dimensions. Again, the XRD pattern is associated well with the orthorhombic phase GdF3, and without diffraction peaks of LiF any more (Figure 4C). Figure 4C inset shows the SAED pattern of this prepared sample. Figure 4B shows the TEM of the obtained nanocrystals that were prepared under identical conditions as the ones in Figure 4A, but using traditional conductive heating. Shape and size of these particles are roughly in the order of magnitude of the standard conditions described above. However, the XRD pattern (inset Figure 4B) of these nanocrystals shows that mainly cubic LiF nanocrystals have been synthesized.

Bottom Line: We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis.Typical upconversion emission from Er3+ was observed.In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute Materials for Electronics and Energy Technology (I-MEET), Friedrich Alexander Universität Erlangen-Nürnberg, Marternsstraße 7, 91058, Erlangen, Germany. wang.hai-qiao@ww.uni-erlangen.de.

ABSTRACT
We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis. Typical upconversion emission from Er3+ was observed. In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

No MeSH data available.


Related in: MedlinePlus