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High temperature stable monodisperse superparamagnetic core-shell nanoparticles
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View: Figures


Image of FIG. 1.
FIG. 1.

TEM images of (a) iron-oxide NPs with a HRTEM image (inset) of a typical particle with spacing fringe (SF) of . (b) Core-shell structured iron-oxide NPs with HRTEM images (inset) of a typical particle with SFs of iron-oxide in the core and in the shell. (c) Particle size distribution of A. (d) Particle size distribution of B, The average shell thickness is around 2 nm. (e) XRD patterns of as-prepared A and B. (f) Room temperature magnetization curves of A and B. The inset is a picture of ‘B’ ferrofluid attached with a magnet. (g) An illustration of the coating process.

Image of FIG. 2.
FIG. 2.

(a) DTA curves of as-prepared A and B. TEM images (b) of iron-oxide NPs after heated to to be (inset HRTEM image showing a typical SF of ). (c) NPs after heated to , (d) after heated to , , and NPs (inset HRTEM images showing typical SFs of and ).

Image of FIG. 3.
FIG. 3.

XRD patterns for A and B annealed at different conditions.

Image of FIG. 4.
FIG. 4.

XAFS data for as-prepared and annealed samples at Fe edge. (a) the environment around Fe atoms in real space after Fourier transformation and (b) in k space.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High temperature stable monodisperse superparamagnetic core-shell iron-oxide@SnO2 nanoparticles