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Orientation-independent room temperature optical C-13 hyperpolarization in powdered diamond

Ajoy, A; Liu, K; Nazaryan, R; Lv, X; Zangara, PR; Safvati, B; Wang, G; ... Pines, A; + view all (2018) Orientation-independent room temperature optical C-13 hyperpolarization in powdered diamond. Science Advances , 4 (5) , Article eaar5492. 10.1126/sciadv.aar5492. Green open access

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Abstract

Dynamic nuclear polarization via contact with electronic spins has emerged as an attractive route to enhance the sensitivity of nuclear magnetic resonance beyond the traditional limits imposed by magnetic field strength and temperature. Among the various alternative implementations, the use of nitrogen vacancy (NV) centers in diamond—a paramagnetic point defect whose spin can be optically polarized at room temperature—has attracted widespread attention, but applications have been hampered by the need to align the NV axis with the external magnetic field. We overcome this hurdle through the combined use of continuous optical illumination and a microwave sweep over a broad frequency range. As a proof of principle, we demonstrate our approach using powdered diamond with which we attain bulk 13C spin polarization in excess of 0.25% under ambient conditions. Remarkably, our technique acts efficiently on diamond crystals of all orientations and polarizes nuclear spins with a sign that depends exclusively on the direction of the microwave sweep. Our work paves the way toward the use of hyperpolarized diamond particles as imaging contrast agents for biosensing and, ultimately, for the hyperpolarization of nuclear spins in arbitrary liquids brought in contact with their surface.

Type: Article
Title: Orientation-independent room temperature optical C-13 hyperpolarization in powdered diamond
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/sciadv.aar5492
Publisher version: http://dx.doi.org/10.1126/sciadv.aar5492
Language: English
Additional information: Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Keywords: Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, Dynamic Nuclear-Polarization, Fluorescent Nanodiamonds, Nmr, Spectroscopy, Dependence, Hydrogen, Centers, Liquids, State, Times
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10054226
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