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

Wright, Joshua T.; 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:1438710

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

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

Here, 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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1438710

Report Number(s):: LLNL-JRNL-739592; JMCCCX

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

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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