In this presentation we describe the preparation of multi-color quantum dot clusters.  Using purpose-built CdSe/ZnS quantum dots and rods modified with single stranded oligonucleotides (ssDNA), clusters with defined stoichiometry and emission wavelengths were constructed by DNA mediated interactions. To control stoichiometry and to improve assembly yields, the clusters were assembled and released in a step-wise manner at a colloidal solid support. The clusters optical characteristics were characterized by fluorescence spectroscopy and microscopy, and FRET analysis was utilized to probe energy transfer within the clusters.  The cluster morphology and hydrodynamic properties were characterized by TEM and DLS, respectively.  The use of these clusters for sensing and multi-color multiplexing will also be discussed.

Stepwise assembly of multicolor qdot clusters using a DNA-mediated approach

246th National Meeting (2013)

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