22 February 2013 Layered double hydroxides as carriers for quantum dots@silica nanospheres
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Abstract
Quantum dot-hydrotalcite layered nanoplatforms were successfully prepared following a one-pot synthesis. The process is very fast and a priori delamination of hydrotalcite is not a prerequisite for the intercalation of quantum dots. The novel materials were extensively characterized by X-ray diffraction, thermogravimetry, infrared spectroscopy, transmission electron microscopy, true color fluorescence microscopy, photoluminescence, and nitrogen adsorption. The quantum dot-hydrotalcite nanomaterials display extremely high stability in mimicking physiological media such as saline serum (pH 5.5) and PBS (pH 7.2). Yet, quantum dot release from the solid structure is noted. In order to prevent the leaking of quantum dots we have developed a novel strategy which consists on using tailor made double layered hydrotalcites as protecting shells for quantum dots embedded into silica nanospheres without changing either the materials or the optical properties.
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Georgiana Stoica, Iván Castelló Serrano, Emilio Palomares, "Layered double hydroxides as carriers for quantum dots@silica nanospheres", Proc. SPIE 8595, Colloidal Nanocrystals for Biomedical Applications VIII, 85951A (22 February 2013); doi: 10.1117/12.2000407; https://doi.org/10.1117/12.2000407
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