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Article
Structure of Colloidal Quantum Dots from Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy
Journal of the American Chemical Society (2015)
  • Laura Piveteau, ETH Zürich
  • Ta-Chung Ong, ETH Zürich
  • Aaron J. Rossini
  • Lyndon Emsley, Institut des Sciences et Ingénierie Chimiques
  • Christophe Coperet, ETH Zürich
  • Maksym V. Kovalenko, ETH Zürich
Abstract
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.
Publication Date
October 16, 2015
DOI
10.1021/jacs.5b09248
Publisher Statement
Reprinted (adapted) with permission from Journal of the American Chemical Society, 137(43); 13964-13971. Doi: 10.1021/jacs.5b09248. Copyright 2015 American Chemical Society.
Citation Information
Laura Piveteau, Ta-Chung Ong, Aaron J. Rossini, Lyndon Emsley, et al.. "Structure of Colloidal Quantum Dots from Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy" Journal of the American Chemical Society Vol. 137 Iss. 43 (2015) p. 13964 - 13971
Available at: http://works.bepress.com/aaron-rossini/2/