Abstract
The distribution and interaction of isolated Mn2+ impurity ions incorporated in 2.9 nm average diameter cubic ZnS quantum dots (QDs), prepared by surfactant–assisted liquid–liquid synthesis with initial impurity concentrations in the 20–50,000 ppm range, has been investigated by electron paramagnetic resonance (EPR) spectroscopy. The well resolved spectra, observed in the whole investigated concentration range, reflect the localization of the Mn2+ ions in the core and on the surface of the cZnS:Mn QDs at isolated sites. According to the analysis of the dependences of the concentration of incorporated isolated Mn2+ ions vs. initial impurity concentration and of the core localized Mn2+ ions spectra linewidth vs. actual concentration, the isolated Mn2+ ions remain in the whole concentrations range in a diluted paramagnetic state characterized by dipolar magnetic interactions. Pulse EPR measurements of the spin–spin dipolar interaction for the incorporated Mn2+ ions confirm their diluted distribution, which excludes these ions as a possible source of collective magnetism properties.
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