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  4. Fast and Sensitive Detection of Paramagnetic Species Using Coupled Charge and Spin Dynamics in Strongly Fluorescent Nanodiamonds
 
research article

Fast and Sensitive Detection of Paramagnetic Species Using Coupled Charge and Spin Dynamics in Strongly Fluorescent Nanodiamonds

Gorrini, F.
•
Giri, R.
•
Avalos, C. E.  
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July 10, 2019
ACS Applied Materials & Interfaces

Sensing of a few unpaired electron spins, such as in metal ions and radicals, is a useful but difficult task in nanoscale physics, biology, and chemistry. Single negatively charged nitrogen-vacancy (NV-) centers in diamond offer high sensitivity and spatial resolution in the optical detection of weak magnetic fields produced by a spin bath but often require long acquisition times on the order of seconds. Here, we present an approach based on coupled spin and charge dynamics in dense NV ensembles in strongly fluorescent nanodiamonds (NDs) to sense external magnetic dipoles. We apply this approach to various paramagnetic species, including gadolinium complexes, magnetite nanoparticles, and hemoglobin in whole blood. Taking advantage of the high NV density, we demonstrate a dramatic reduction in acquisition time (down to tens of milliseconds) while maintaining high sensitivity to paramagnetic centers. Strong luminescence, high sensitivity, and short acquisition time make dense NV- ensembles in NDs a potentially promising tool for biosensing and bioimaging applications.

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Type
research article
DOI
10.1021/acsami.9b05779
Web of Science ID

WOS:000475532200065

Author(s)
Gorrini, F.
•
Giri, R.
•
Avalos, C. E.  
•
Tambalo, S.
•
Mannucci, S.
•
Basso, L.
•
Bazzanella, N.
•
Dorigoni, C.
•
Cazzanelli, M.
•
Marzola, P.
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Date Issued

2019-07-10

Published in
ACS Applied Materials & Interfaces
Volume

11

Issue

27

Start page

24412

End page

24422

Subjects

Nanoscience & Nanotechnology

•

Materials Science, Multidisciplinary

•

Science & Technology - Other Topics

•

Materials Science

•

nitrogen-vacancy centers

•

nanodiamonds

•

spin relaxation

•

charge dynamics

•

vacancy color-center

•

electric-field

•

diamond

•

nanoparticles

•

photochromism

•

size

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
ISIC  
Available on Infoscience
July 31, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/159469
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