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Surface spin disorder effects in magnetite and poly(thiophene)-coated magnetite nanoparticles
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10.1063/1.3488634
/content/aip/journal/jap/108/6/10.1063/1.3488634
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/6/10.1063/1.3488634

Figures

Image of FIG. 1.
FIG. 1.

Rietveld refined XRD patterns of (a) magnetite and (b) poly(thiophene)/magnetite nanoparticles. The patterns have been assigned to crystallites with spinel structure ( space group) for both samples. For the nanocomposite, in addition to magnetite lines, a background characteristic of polymer materials is observed.

Image of FIG. 2.
FIG. 2.

Bright-field TEM images showing (a) magnetite and (b) poly(thiophene)/magnetite nanoparticles. The bottom insets show the histograms of particle diameters obtained from TEM images (the straight lines are lognormal fittings).

Image of FIG. 3.
FIG. 3.

Temperature dependence of the magnetization of magnetite and poly(thiophene)/magnetite nanoparticles for FC and ZFC curves. All measurements were performed with a magnetic field probe of 200 Oe. The curves show typical SPM behavior.

Image of FIG. 4.
FIG. 4.

(at 300 K) curves for (a) magnetite and (b) poly(thiophene)/magnetite nanoparticles. The continuous curves are the best fits obtained for each sample using Eq. (4). The insets show the particle diameter distribution obtained by fitting.

Tables

Generic image for table
Table I.

Mean particle diameters , , and and crystallite sizes determined from FC and ZFC (FC-ZFC) magnetic curves, magnetization curves at 300 K, TEM, and XRD for the magnetite nanoparticles and the magnetite/poly(thiophene) nanocomposite. is the saturation magnetization and the standard deviation.

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/content/aip/journal/jap/108/6/10.1063/1.3488634
2010-09-23
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Surface spin disorder effects in magnetite and poly(thiophene)-coated magnetite nanoparticles
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/6/10.1063/1.3488634
10.1063/1.3488634
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