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Synthesis of CdSe nanoparticles in the presence of aminodextran as stabilizing and capping agent

Water-dispersible Amdex-CdSe nanoparticle complexes with sufficient luminescence intensity were prepared at room temperature by rapid mixing aqueous solutions of either sodium selenide or selenourea with those of cadmium chloride in the presence of an amino-derivatized polysaccharide (Amdex) as stabilizing agent. It was shown that the size of CdSe crystallites decreased with increasing content of the polymer in the precipitation process. Furthermore, when present in sufficient amount, Amdex was found to be an effective stabilizing and capping agent, causing strong luminiscence of CdSe nanocrystals and protecting them from photochemical degradation.

aminodextran; nanoparticles; Cadmium selenide; photoluminiscence

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