Surface Sensing of Quantum Dots by Electron Spins

Fabrizio Moro; Lyudmila Turyanska; James Wilman; Huw E.L. Williams; Alistair Fielding; Amalia Patane

doi:10.1021/acs.nanolett.6b02727

Surface Sensing of Quantum Dots by Electron Spins

Fabrizio Moro (Corresponding), Lyudmila Turyanska, James Wilman, Huw E.L. Williams, Alistair Fielding, Amalia Patane

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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.

Original language	English
Pages (from-to)	6343–6348
Journal	Nano Letters
Volume	16
Issue number	10
DOIs	https://doi.org/10.1021/acs.nanolett.6b02727
Publication status	Published - 14 Sept 2016

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title = "Surface Sensing of Quantum Dots by Electron Spins",

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 {\AA} sensitivity. These findings demonstrate the potential of magnetically doped QDs as sensitive magnetic nanoprobes and the use of electron spins for surface sensing.",

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T1 - Surface Sensing of Quantum Dots by Electron Spins

AU - Turyanska, Lyudmila

AU - Wilman, James

AU - Williams, Huw E.L.

AU - Fielding, Alistair

AU - Patane, Amalia

A2 - Moro, Fabrizio

PY - 2016/9/14

Y1 - 2016/9/14

N2 - 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.

AB - 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.

U2 - 10.1021/acs.nanolett.6b02727

DO - 10.1021/acs.nanolett.6b02727

M3 - Article

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VL - 16

SP - 6343

EP - 6348

JO - Nano Letters

JF - Nano Letters

IS - 10

ER -

Surface Sensing of Quantum Dots by Electron Spins

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