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  Monodisperse Hexagonal Pyramidal and Bipyramidal Wurtzite CdSe-CdS Core–Shell Nanocrystals

Tan, R., Yuan, Y., Nagaoka, Y., Eggert, D., Wang, X., Thota, S., et al. (2017). Monodisperse Hexagonal Pyramidal and Bipyramidal Wurtzite CdSe-CdS Core–Shell Nanocrystals. Chemistry of Materials, 29(9), 4097-4108. doi:10.1021/acs.chemmater.7b00968.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-9D7E-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B4B9-3
Genre: Journal Article

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 Creators:
Tan, R.1, Author
Yuan, Y.1, Author
Nagaoka, Y.1, Author
Eggert, D.2, 3, Author              
Wang, X.4, Author
Thota, S.4, Author
Guo∥, P.5, Author
Yang, H.1, 6, Author
Zhao, J.4, Author
Chen, O.1, Author
Affiliations:
1Department of Chemistry, Brown University, Providence, ou_persistent22              
2Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
3Heinrich Pette Institute-Leibniz Institute for Experimental Virology, ou_persistent22              
4Department of Chemistry, University of Connecticut, Storrs, ou_persistent22              
5Vascular Biology Program, Children’s Hospital Boston, Harvard Medical School, Boston, ou_persistent22              
6Department of Electronic Engineering, The Chinese University of Hong Kong, ou_persistent22              

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 Abstract: 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 {101̅1} 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 HBP-QDs an excellent candidate for intracellular imaging and labeling.

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Language(s): eng - English
 Dates: 2017-04-172017-03-082017-04-182017-05-09
 Publication Status: Published in print
 Pages: 12
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.chemmater.7b00968
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Project name : O.C. acknowledges the support from the Brown University startup fund and the Salomon award fund. J.Z. acknowledges the fi nancial support from the National Science Foundation CAREER award (Grant CHE 1554800). P.G. acknowledges the support of the National Natural Science Foundation of China (Grant 81501572). The TEM and XRD measurements were performed at the Nano Tools Facility and the Electron Microscopy Facility in the Institute for Molecular and Nanoscale Innovation (IMNI) at Brown University. The EDX mapping studies were performed using the facilities in the UConn/FEI Center for Advanced Microscopy and Materials Analysis (CAMMA).
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Title: Chemistry of Materials
  Abbreviation : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 29 (9) Sequence Number: - Start / End Page: 4097 - 4108 Identifier: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571