接近单位量子产率的核/壳纳米结构的结构基础。

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

作者信息

McBride James, Treadway Joe, Feldman L C, Pennycook Stephen J, Rosenthal Sandra J

机构信息

Department of Chemistry, Vanderbilt University, Nashville, TN 37235, USA.

出版信息

Nano Lett. 2006 Jul;6(7):1496-501. doi: 10.1021/nl060993k.

DOI:10.1021/nl060993k

PMID:16834437

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.

摘要

对核/壳纳米晶体进行像差校正的Z衬度扫描透射电子显微镜观察显示，结构与量子效率之间存在明显的相关性。仅对于渐变的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。图像的亚晶格灵敏度证实，优先生长发生在阴离子端接的表面上。这解释了在核/壳纳米棒的情况下观察到的三维“纳米子弹”形状。