Probing the local site environments in Mn:CdSe quantum dots

Weiwei Zheng, Zhenxing Wang, Joshua Wright, Ben Goundie, Naresh S. Dalal, Robert W. Meulenberg, Geoffrey F. Strouse

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

A quantum dot (QD) contains a well-defined surface passivated by ligands and a bulklike core. The effect of surface passivation and lattice truncation on local structural and electronic microenvironments within a CdSe QD is an area of active research. Selectively probing the local microenvironments that exist at the surface and core of the QD is difficult but can be achieved by use of a Mn(II) impurity ion doped into a CdSe QD using electron paramagnetic resonance (EPR). By use of high frequency EPR (HF-EPR) spectroscopy, the site-dependent perturbation experienced for Mn(II) incorporated as a guest ion into CdSe QDs allows the distinguishing of two unique microenvironments within the QD, namely, an unperturbed core and an electronically distorted surface. Analysis of the Landé g-factor, hyperfine constant (A), and the distribution of g and D (δg, δD) allows the local microenvironments within CdSe to be probed as a function of size, ligand passivation, and site of Mn(II) incorporation.

Original languageEnglish (US)
Pages (from-to)23305-23314
Number of pages10
JournalJournal of Physical Chemistry C
Volume115
Issue number47
DOIs
StatePublished - Dec 1 2011
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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  • Cite this

    Zheng, W., Wang, Z., Wright, J., Goundie, B., Dalal, N. S., Meulenberg, R. W., & Strouse, G. F. (2011). Probing the local site environments in Mn:CdSe quantum dots. Journal of Physical Chemistry C, 115(47), 23305-23314. https://doi.org/10.1021/jp2082215