Structural basis for near unity quantum yield core/shell nanostructures.
basic_science · Level V
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Abstract
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.
Medical subject headings
- Cadmium Compounds
- Nanostructures
- Sulfides
- Zinc Compounds