Title

One-pot preparation of highly fluorescent cadmium telluride/cadmium sulfide quantum dots under neutral-pH condition for biological applications

RIS ID

72003

Publication Details

Zhu, Y, Li, Z, Chen, M, Cooper, HM, Lu, G & Xu, Z, (2013), One-pot preparation of highly fluorescent cadmium telluride/cadmium sulfide quantum dots under neutral-pH condition for biological applications, Journal of Colloid and Interface Science, 390(1), pp. 3-10.

Abstract

Water-soluble CdTe/CdS quantum dots (QDs) with tuneable emissions were prepared in aqueous solution at pH = 6-7 via refluxing and hydrothermal treatment. The resultant CdTe/CdS QDs are stabilized with mercaptosuccinic acid (MSA) and show high fluorescence quantum yields (maximum QY is 84%). Characterization with UV-Vis, PL, XPS, XRD and TEM demonstrates a core (CdTe)-shell (CdS) structure, which leads to high fluorescence quantum yields. The effective protection from CdS shell and MSA enables CdTe QDs to be chemically stable in a pH range of 6-9 and less toxic. These merits make our CdTe/CdS QDs very promising for bio-imaging applications, as exemplified by labelling HEK 293 cells.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jcis.2012.08.003