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Issue 26, 2016
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Identifying short surface ligands on metal phosphide quantum dots

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Abstract

The control and understanding of the chemical and physical properties of quantum dots (QDs) demands detailed surface characterization. However, probing the immediate interface between the inorganic core and the ligands is still a major challenge. Here we show that using cross-polarization magic angle spinning (MAS) NMR, unprecedented information can be obtained on the surface ligands of Cd3P2 and InP QDs. The resonances of fragments which are usually challenging to detect like methylene or methyl near the surface, can be observed with our approach. Moreover, ligands such as hydroxyl and ethoxide which have so far never been detected at the surface can be unambiguously identified. This NMR approach is versatile, applicable to any phosphides and highly sensitive since it remains effective for identifying quantities as low as a few percent of surface atoms.

Graphical abstract: Identifying short surface ligands on metal phosphide quantum dots

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Publication details

The article was received on 24 May 2016, accepted on 13 Jun 2016 and first published on 13 Jun 2016


Article type: Communication
DOI: 10.1039/C6CP03564G
Citation: Phys. Chem. Chem. Phys., 2016,18, 17330-17334
  • Open access: Creative Commons BY-NC license
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    Identifying short surface ligands on metal phosphide quantum dots

    E. A. Baquero, W. Ojo, Y. Coppel, B. Chaudret, B. Urbaszek, C. Nayral and F. Delpech, Phys. Chem. Chem. Phys., 2016, 18, 17330
    DOI: 10.1039/C6CP03564G

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