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

Su, Dong; van Buuren, Tony; Meulenberg, Robert W.

doi:10.1039/c4tc01324g

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

Journal Article · Thu Aug 21 00:00:00 EDT 2014 · Journal of Materials Chemistry C

DOI:https://doi.org/10.1039/c4tc01324g· OSTI ID:1156879

Su, Dong ^[1]; van Buuren, Tony ^[2]; Meulenberg, Robert W. ^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Maine, Orono, ME (United States)

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. Moreover, the 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1156879

Report Number(s):: BNL-106062-2014-JA; R&D Project: 16060; KC0403020

Journal Information:: Journal of Materials Chemistry C, Vol. 2, Issue 39; ISSN 2050-7526

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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