Surface sensing of quantum dots by electron spins

Moro, Fabrizio and Turyanska, Lyudmila and Wilman, James and Williams, Huw E. L. and Fielding, Alistair J. and Patanè, Amalia (2016) Surface sensing of quantum dots by electron spins. Nano Letters, 16 (10). pp. 6343-6348. ISSN 1530-6984

Full content URL: http://doi.org/10.1021/acs.nanolett.6b02727

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Abstract

The nanoscale design of quantum dots (QDs) requires advanced analytical techniques. However, those that are commonly used do not have sufficient sensitivity or spatial resolution. Here, we use magnetic resonance techniques combined with paramagnetic Mn impurities in PbS QDs for sensitive probing of the QD surface and environment. In particular, we reveal inequivalent proton spin relaxations of the capping ligands and solvent molecules, strengths and anisotropies of the Mn nuclear spin interactions, and Mn nuclei distances with ∼1 Å sensitivity. These findings demonstrate the potential of magnetically doped QDs as sensitive magnetic nanoprobes and the use of electron spins for surface sensing.

Keywords:colloidal quantum dots, magnetic doping, electron spin resonance, nuclear magnetic resonance, JCOpen
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
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ID Code:24585
Deposited On:06 Oct 2016 10:09

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