NSTI Nanotech 2009

Uncapped Clusters and Quantum Dots via Electroporation of Synthetic Liposomes

R. Reddy Vanga, Z.A. Schelly
University Of Texas at Arlington, US

Keywords: quantum dots, nanoclusters, liposomes, optical properties

Abstract:

We have developed a method for the preparation of miniscule uncapped clusters and larger quantum dots of semiconductors and metals in solution, which, for the first time, allows their experimental investigation. In conjunction with density functional theory (DFT) computations, we find such clusters to have molecular structures that do not resemble fragments of the bulk crystal, and may have potential novel applications in light harvesting, catalysis, and as molecular probes. We have successfully grown several uncapped clusters and QDs (including CdS, CdSe, PbS, ZnS, ZnO, ZnS, Ag, and Ag2S) via electroporation. The absence of capping with organic ligands permits (a) continued growth of the particles formed, (b) the assessment of their intrinsic optical spectra unaltered by stabilizing ligands, and (c) the previously inaccessible live observation of the growth of the clusters in the molecular-size regime. Some of the un published and promising recent results will be presented during the conference
 
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