Journal
CHEMISTRY OF MATERIALS
Volume 29, Issue 9, Pages 4097-4108Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b00968
Keywords
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Funding
- Brown University
- Salomon award fund
- National Science Foundation CAREER award [CHE 1554800]
- National Natural Science Foundation of China [81501572]
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Heterostructural 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 heteroshell 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 work, we present the first report on a synthesis of pyramidal shaped (i.e., hexagonal pyramid, HP, and hexagonal bipyramid, HBP) CdSe-CdS hetero-QDs with high morphological uniformity and epitaxial crystallinity through a two-step shell growth method. The stabilization of the exposed (0002) and {10 (1) over bar1} facets by octadecylphosphonic acid and oleic acid ligands, respectively, is the key for the formation of pyramidal particle shapes. High photoluminescence quantum yield (94%, HP-QDs and 73%, HBP-QDs), minimal inhomogeneous PL line width broadening, and significantly suppressed single-QD blinking are observed. Specifically, the giant HBP-QDs showed an average On time fraction of 96% with more than 50% of measured particles completely nonblinking. Additionally, high multiexciton emission, prolonged ensemble and single-QD PL lifetimes as compared to their spherical counterparts are also reported. Finally, the HBP-QDs have been successfully transferred into an aqueous solution without aggregation. High cellular uptakes associated with low cytotoxicity render these-water-soluble HBPQDs an excellent candidate for intracellular imaging and labeling.
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