Detection of Paramagnetic Spins with an Ultrathin van der Waals Quantum Sensor.

Robertson, IO; Scholten, SC; Singh, P; Healey, AJ; Meneses, F; Reineck, P; Abe, H; Ohshima, T; Kianinia, M; Aharonovich, I; Tetienne, J-P

Detection of Paramagnetic Spins with an Ultrathin van der Waals Quantum Sensor.

Robertson, IO Scholten, SC Singh, P Healey, AJ Meneses, F Reineck, P Abe, H Ohshima, T Kianinia, M

Aharonovich, I

Tetienne, J-P

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: ACS Nano, 2023, 17, (14), pp. 13408-13417
Issue Date:: 2023-07-25

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Field	Value	Language
dc.contributor.author	Robertson, IO
dc.contributor.author	Scholten, SC
dc.contributor.author	Singh, P
dc.contributor.author	Healey, AJ
dc.contributor.author	Meneses, F
dc.contributor.author	Reineck, P
dc.contributor.author	Abe, H
dc.contributor.author	Ohshima, T
dc.contributor.author	Kianinia, M https://orcid.org/0000-0003-4073-1492
dc.contributor.author	Aharonovich, I https://orcid.org/0000-0003-4304-3935
dc.contributor.author	Tetienne, J-P
dc.date.accessioned	2024-02-08T05:15:27Z
dc.date.available	2024-02-08T05:15:27Z
dc.date.issued	2023-07-25
dc.identifier.citation	ACS Nano, 2023, 17, (14), pp. 13408-13417
dc.identifier.issn	1936-0851
dc.identifier.issn	1936-086X
dc.identifier.uri	http://hdl.handle.net/10453/175491
dc.description.abstract	Detecting magnetic noise from small quantities of paramagnetic spins is a powerful capability for chemical, biochemical, and medical analysis. Quantum sensors based on optically addressable spin defects in bulk semiconductors are typically employed for such purposes, but the 3D crystal structure of the sensor inhibits sensitivity by limiting the proximity of the defects to the target spins. Here we demonstrate the detection of paramagnetic spins using spin defects hosted in hexagonal boron nitride (hBN), a van der Waals material that can be exfoliated into the 2D regime. We first create negatively charged boron vacancy (VB-) defects in a powder of ultrathin hBN nanoflakes (<10 atomic monolayers thick on average) and measure the longitudinal spin relaxation time (T1) of this system. We then decorate the dry hBN nanopowder with paramagnetic Gd3+ ions and observe a clear T1 quenching under ambient conditions, consistent with the added magnetic noise. Finally, we demonstrate the possibility of performing spin measurements, including T1 relaxometry using solution-suspended hBN nanopowder. Our results highlight the potential and versatility of the hBN quantum sensor for a range of sensing applications and make steps toward the realization of a truly 2D, ultrasensitive quantum sensor.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	AMER CHEMICAL SOC
dc.relation	http://purl.org/au-research/grants/arc/CE170100012
dc.relation	http://purl.org/au-research/grants/arc/CE200100010
dc.relation	United States Department of the NavyN629092212028
dc.relation	http://purl.org/au-research/grants/arc/FT220100053
dc.relation.ispartof	ACS Nano
dc.relation.isbasedon	10.1021/acsnano.3c01678
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Nanoscience & Nanotechnology
dc.title	Detection of Paramagnetic Spins with an Ultrathin van der Waals Quantum Sensor.
dc.type	Journal Article
utslib.citation.volume	17
utslib.location.activity	United States
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2024-02-08T05:15:26Z
pubs.issue	14
pubs.publication-status	Published
pubs.volume	17
utslib.citation.issue	14

Abstract:

Detecting magnetic noise from small quantities of paramagnetic spins is a powerful capability for chemical, biochemical, and medical analysis. Quantum sensors based on optically addressable spin defects in bulk semiconductors are typically employed for such purposes, but the 3D crystal structure of the sensor inhibits sensitivity by limiting the proximity of the defects to the target spins. Here we demonstrate the detection of paramagnetic spins using spin defects hosted in hexagonal boron nitride (hBN), a van der Waals material that can be exfoliated into the 2D regime. We first create negatively charged boron vacancy (VB-) defects in a powder of ultrathin hBN nanoflakes (<10 atomic monolayers thick on average) and measure the longitudinal spin relaxation time (T1) of this system. We then decorate the dry hBN nanopowder with paramagnetic Gd3+ ions and observe a clear T1 quenching under ambient conditions, consistent with the added magnetic noise. Finally, we demonstrate the possibility of performing spin measurements, including T1 relaxometry using solution-suspended hBN nanopowder. Our results highlight the potential and versatility of the hBN quantum sensor for a range of sensing applications and make steps toward the realization of a truly 2D, ultrasensitive quantum sensor.

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http://hdl.handle.net/10453/175491