Surface Sensing of Quantum Dots by Electron Spins

Research output: Contribution to journalArticle

  • Authors:
  • Fabrizio Moro (Corresponding)
  • Lyudmila Turyanska
  • James Wilman
  • Huw E.L. Williams
  • Alistair Fielding
  • And 1 others
  • External authors:
  • Amalia Patane

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.

Bibliographical metadata

Original languageEnglish
Pages (from-to) 6343–6348
JournalNano Letters
Volume16
Issue number10
DOIs
StatePublished - 14 Sep 2016