Structural basis for near unity quantum yield core/shell nanostructures
Structural basis for near unity quantum yield core/shell nanostructures
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DOI：
10.1021/nl060993k
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发表时间：
2006-07-12
期刊：
影响因子：
10.8
通讯作者：
Rosenthal, Sandra J.
中科院分区：
文献类型：
--
作者：
McBride, James;Treadway, Joe;Rosenthal, Sandra J.
对核/壳纳米晶体进行的像差校正Z衬度扫描透射电子显微镜观察表明，结构与量子效率之间存在明显的关联。只有使用渐变的CdS/ZnS壳层材料才能获得均匀的壳层覆盖，并且发现这对于实现接近100%的量子产率至关重要。图像的亚晶格敏感性证实了优先生长发生在阴离子终止的表面上。这解释了在核/壳纳米棒情况下观察到的三维“纳米子弹”形状。
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.