Journal
PHYSICAL REVIEW B
Volume 101, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.155416
Keywords
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Funding
- Australian Research Council Centre of Excellence Scheme [EQuS CE110001013]
- ARC [DP1094439]
- Australian Research Council [DP1094439] Funding Source: Australian Research Council
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Nanodiamond is poised to become an attractive material for hyperpolarized C-13 magnetic resonance imaging if large nuclear polarizations can be achieved without the accompanying rapid spin-relaxation driven by paramagnetic species. Here we report enhanced and long-lived C-13 polarization in synthetic nanodiamonds tailored by acid-cleaning and air-oxidation protocols. Our results separate the contributions of different paramagnetic species on the polarization behavior, identifying the importance of substitutional nitrogen defect centers in the nanodiamond core. These results are likely of use in the development of nanodiamond-based imaging agents with size distributions of relevance for examining biological processes.
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