Structural basis for near unity quantum yield core/shell nanostructures.

McBride J, Treadway J, Feldman LC, Pennycook SJ, Rosenthal SJ
Nano Lett. 2006 6 (7): 1496-501

PMID: 16834437 · DOI:10.1021/nl060993k

Aberration-corrected Z-contrast scanning transmission electron microscopy of core/shell nanocrystals shows clear correlations between structure and quantum efficiency. Uniform shell coverage is obtained only for a graded CdS/ZnS shell material and is found to be critical to achieving near 100% quantum yield. The sublattice sensitivity of the images confirms that preferential growth takes place on the anion-terminated surfaces. This explains the three-dimensional "nanobullet" shape observed in the case of core/shell nanorods.

MeSH Terms (6)

Cadmium Compounds Microscopy, Electron, Scanning Transmission Nanostructures Quantum Dots Sulfides Zinc Compounds

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