Incorporation of quantum dots into a silica matrix using a compatible precursor |
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Authors: | K M Sergeeva I V Postnova Yu A Shchipunov |
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Institution: | 1. Far East Federal University, ul. Oktyabr’skaya 27, Vladivostok, 690950, Russia 2. Institute of Chemistry, Far East Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia 3. The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Division of Chemical Engineering, Pusan National University, Busan, South Korea
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Abstract: | A method is developed for one-stage incorporation of cadmium-sulfide quantum dots synthesized in the presence of mercaptosuccinic acid into a silica matrix formed from a precursor containing ethylene-glycol residues—tetrakis(2-hydroxyethyl) orthosilica. This precursor has not previously been applied for this purpose. It is more compatible with diverse substances than tetraethoxysilane, which is traditionally used. Moreover, it is advantageous in its unlimited solubility in water; release of ethylene glycol, which does not precipitate quantum dots, rather than alcohol upon hydrolysis; and the feasibility of performing the sol-gel process at any pH value in a range of 2–10 without the addition of acid or alkali and without heating. When the precursor (50 wt %) is added to a dispersion of quantum dots, the system is transformed into a gel in as little as a few minutes. The synthesized hybrid materials are optically transparent. Therewith, the quantum dots incorporated into the silica matrix exhibit luminescence, with their spectral characteristics remaining almost unchanged. |
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