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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.


Related in: MedlinePlus

TEMs of GdF3 nanocrystals. (A) Overview graph of single nanocrystals and "stacks". (B) Blow-up of self-assembled nanocrystals.
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Figure 1: TEMs of GdF3 nanocrystals. (A) Overview graph of single nanocrystals and "stacks". (B) Blow-up of self-assembled nanocrystals.

Mentions: Figure 1 shows TEMs of the resulting nanocrystals. It was observed that the particles were regularly shaped rhombic plates with approximately 3.2 nm thickness, approximately 45 nm in length and with a roughly calculated aspect ratio of 1:3. Both micrographs show clearly that the nanoplates have a strong tendency to form two-dimensional aggregates. This effect can be attributed to the minimization in energy, which is achieved by hydrophobic interaction of the surface ligands of the nanoparticles at their largest faces.


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

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

TEMs of GdF3 nanocrystals. (A) Overview graph of single nanocrystals and "stacks". (B) Blow-up of self-assembled nanocrystals.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: TEMs of GdF3 nanocrystals. (A) Overview graph of single nanocrystals and "stacks". (B) Blow-up of self-assembled nanocrystals.
Mentions: Figure 1 shows TEMs of the resulting nanocrystals. It was observed that the particles were regularly shaped rhombic plates with approximately 3.2 nm thickness, approximately 45 nm in length and with a roughly calculated aspect ratio of 1:3. Both micrographs show clearly that the nanoplates have a strong tendency to form two-dimensional aggregates. This effect can be attributed to the minimization in energy, which is achieved by hydrophobic interaction of the surface ligands of the nanoparticles at their largest faces.

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