Hetero-structural core-shell quantum dots (hetero-QDs) have garnered a copious amount of research effort for not only scientific advances but also a range of technological applications. Particularly, controlling the hetero-shell deposition, which in turn determines the particle morphology is vital in regulating the photophysical properties and the application potential of the hetero-QDs. In this talk, I will present a synthesis of pyramidal shaped (i.e., hexagonal pyramid, HP, and hexagonal bipyramid, HBP) CdSe-CdS hetero-QDs through a two-step shell growth method. The detailed shape evolution mechnism will be discussed. The resultant HP- and HBP-QDs exhibit not only high morphological uniformity with perfect epitaxial wurtzite crystallinity, but also superior optical properties at both ensemble and single particle levels. Moreover, the HBP-QDs have been successfully transferred into an aqueous solution without aggregation. High cellular uptakes associated with low cytotoxicity render these water-soluble HBP-QDs an excellent candidate for intracellular imaging and labeling.

Monodisperse hexagonal pyramidal and bipyramidal wurtzite CdSe-CdS core-shell nanocrystals

254th National Meeting (2017)

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