Abstract
The quantum dots (QDs) for use in nanobiotechnology trials should be thermodynamically stable and have homogeneous dispersion, high radiative quantum efficiency (η), a very broad absorption spectrum, low levels of nonspecific links to biological compounds and, most importantly, stability in aqueous media. Recently, a new class of CdSe QDs called magic-sized quantum dots (MSQDs), with sizes from 1 to 2 nm and well-defined structures, has attracted considerable attention because of its novel physical properties. The present work reports the thermo-optical properties of CdSe/CdS MSQDs and CdSe/ZnS QDs suspended in aqueous solutions. Absolute nonradiative quantum efficiency (φ) and η values were determined applying two techniques: the well-known Thermal Lens (TL) technique and an alternative method called thermal spatial self-phase modulation (TSPM) technique.
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