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Issue 39, 2014
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Electronic structure of cobalt doped CdSe quantum dots using soft X-ray spectroscopy

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Abstract

The electronic structure and magnetic properties of cobalt doped CdSe quantum dots (QDs) are studied using electron microscopy, soft X-ray spectroscopy, and magnetometry. Magnetometry measurements suggest these QDs are superparamagnetic, contrary to a spin-glass state observed in the bulk analogue. Electron microscopy shows well formed QDs, but with cobalt existing as doped into the QD and as unreacted species not contained in the QD. X-ray absorption measurements at the Co L3-edge suggest that changes in spectra features as a function of particle size can be described considering combination of a cobalt ion in a tetrahedral crystal field and an octahedrally coordinated (impurity) phase. With decreasing particle sizes, the impurity phase increases, suggesting that small QDs can be difficult to dope.

Graphical abstract: Electronic structure of cobalt doped CdSe quantum dots using soft X-ray spectroscopy

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Article information


Submitted
20 Jun 2014
Accepted
15 Aug 2014
First published
21 Aug 2014

J. Mater. Chem. C, 2014,2, 8313-8321
Article type
Paper

Electronic structure of cobalt doped CdSe quantum dots using soft X-ray spectroscopy

J. T. Wright, D. Su, T. van Buuren and R. W. Meulenberg, J. Mater. Chem. C, 2014, 2, 8313
DOI: 10.1039/C4TC01324G

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