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  4. Structure of Colloidal Quantum Dots from Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy
 
research article

Structure of Colloidal Quantum Dots from Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy

Piyeteau, Laura
•
Ong, Ta-Chung
•
Rossini, Aaron J.  
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2015
Journal Of The American Chemical Society

Understanding the chemistry of colloidal quantum dots (QDs) is primarily hampered by the lack of analytical methods to selectively and discriminately probe the QD core, QD surface and capping ligands. Here, we present a general concept for studying a broad range of QDs such as CdSe, CdTe, InP, PbSe, PbTe, CsPbBr3, etc., capped with both organic and inorganic surface capping ligands, through dynamic nuclear polarization (DNP) surface enhanced NMR spectroscopy. DNP can enhance NMR signals by factors of 10-100, thereby reducing the measurement times by 2-4 orders of magnitude. 1D DNP enhanced spectra acquired in this way are shown to clearly distinguish QD surface atoms from those of the QD core, and environmental effects such as oxidation. Furthermore, 2D NMR correlation experiments, which were previously inconceivable for QD surfaces, are demonstrated to be readily performed with DNP and provide the bonding motifs between the QD surfaces and the capping ligands.

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Type
research article
DOI
10.1021/jacs.5b09248
Web of Science ID

WOS:000364355900043

Author(s)
Piyeteau, Laura
Ong, Ta-Chung
Rossini, Aaron J.  
Emsley, Lyndon  
Coperet, Christophe
Kovalenko, Maksym V.
Date Issued

2015

Published in
Journal Of The American Chemical Society
Volume

137

Issue

43

Start page

13964

End page

13971

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LRM  
Available on Infoscience
February 16, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/124111
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