Magnetic Resonance Study of Nanodiamonds

Shames, Alexander I.; Panich, A. M.; Kempiński, W.; Байдакова, М. В.; Osipov, V. Yu.; Enoki, Takuya; Vul, A. Ya.

doi:10.1002/chin.200605244

Cited by 3 publications

(3 citation statements)

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“…All particles involve a carbon‐based lattice (blue), capped by a functionalized (gray) surface. Most free electrons in the core are associated with electrically neutral substitutional P 1 centers, whereas electronic centers arising from dangling bonds with a variety of chemical terminations, usually hydrogenated or hydroxylated structures, are associated with the particles’ surfaces . Such unpaired electrons can be found in a shell of disordered carbon atoms extending a few Ångströms under the surface of the crystals, and their EPR spectra are characterized by a relatively broad, feature‐free resonance at g =2.0028.…”

Section: Resultsmentioning

confidence: 99%

On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution ¹³C NMR Spectroscopy

et al. 2016

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Dynamic nuclear polarization (DNP) is a versatile option to improve the sensitivity of NMR and MRI. This versatility has elicited interest for overcoming potential limitations of these techniques, including the achievement of solid-state polarization enhancement at ambient conditions, and the maximization of (13) C signal lifetimes for performing in vivo MRI scans. This study explores whether diamond's (13) C behavior in nano- and micro-particles could be used to achieve these ends. The characteristics of diamond's DNP enhancement were analyzed for different magnetic fields, grain sizes, and sample environments ranging from cryogenic to ambient temperatures, in both solution and solid-state experiments. It was found that (13) C NMR signals could be boosted by orders of magnitude in either low- or room-temperature solid-state DNP experiments by utilizing naturally occurring paramagnetic P1 substitutional nitrogen defects. We attribute this behavior to the unusually long electronic/nuclear spin-lattice relaxation times characteristic of diamond, coupled with a time-independent cross-effect-like polarization transfer mechanism facilitated by a matching of the nitrogen-related hyperfine coupling and the (13) C Zeeman splitting. The efficiency of this solid-state polarization process, however, is harder to exploit in dissolution DNP-enhanced MRI contexts. The prospects for utilizing polarized diamond approaching nanoscale dimensions for both solid and solution applications are briefly discussed.

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Section: Resultsmentioning

confidence: 99%

On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution ¹³C NMR Spectroscopy

et al. 2016

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“…Earlier ESR studies demonstrated that the paramagnetic centres (with concentrations of up to 10 20 spin g −1 ) observed in NDs originate from structural defects (dangling C-C bonds at the diamond cluster core) [37,39,40]. Recent ESR measurements [41] showed, however, a 10% increase in the real amount of detectable paramagnetic centres under pumping. It was concluded that 90% of the observed paramagnetic centres (broken bonds) are most likely located at the interface separating the diamond core from the shell.…”

Section: Characterization and Structure Of Nanodiamondsmentioning

confidence: 99%

New prospects and frontiers of nanodiamond clusters

Байдакова

Vul

2007

J. Phys. D: Appl. Phys.

194

111

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The review is devoted to nanodiamond as a member of new nanocarbon allotropes. The past results related to the main features of detonation technology for producing nanodiamond are highlighted. Effects of technology on the structure of nanodiamond particles as well as functionalization of nanodiamond surface to chemical properties are discussed. The real structure of single nanodiamond particles has been critically reviewed and its aggregation problem emphasized. Several applications of nanodiamonds mainly as precursors for CVD diamond film growth, for forming new magnetic nanomaterials and field electron emitters are reviewed. As a result, the availability of nanodiamonds as attractive building blocks for nanotechnology is concluded.

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“…The relaxation process allows for a better understanding of interdependencies between the participants in this process and its quantum mechanics. Carbon-based materials exist in many forms, e.g., graphene [ 3 , 4 , 5 ], graphene oxide quantum dots [ 6 ], nanotubes [ 7 ], graphene oxide (GO) [ 7 , 8 , 9 , 10 ], GO fibers [ 11 ], GO foams [ 12 ], diamonds [ 13 , 14 , 15 , 16 , 17 , 18 , 19 ], and are required in the fields of energy applications, quantum computing/spintronics and biology [ 20 , 21 ]. The source of an electron paramagnetic resonance (EPR) signal can be related to conduction electrons, e.g., anthracite [ 22 ], or localized paramagnetic states, e.g., GO [ 8 ] and graphene [ 23 , 24 ] across different carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Electron Spin Relaxation in Carbon Materials

Tomaszewski

Tadyszak

2022

Materials

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This article focuses on EPR relaxation measurements in various carbon samples, e.g., natural carbons—anthracite, coal, higher anthraxolites, graphite; synthetically obtained carbons—glassy carbons, fullerenes, graphene, graphene oxide, reduced graphene oxide, graphite monocrystals, HOPG, nanoribbons, diamonds. The short introduction presents the basics of resonant electron spin relaxation techniques, briefly describing the obtained parameters. This review presents gathered results showing the processes leading to electron spin relaxation and typical ranges of electron spin relaxation rates for many different carbon types.

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Magnetic Resonance Study of Nanodiamonds

Cited by 3 publications

References 1 publication

On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution ¹³C NMR Spectroscopy

On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution ¹³C NMR Spectroscopy

New prospects and frontiers of nanodiamond clusters

Electron Spin Relaxation in Carbon Materials

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Magnetic Resonance Study of Nanodiamonds

Cited by 3 publications

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On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution 13C NMR Spectroscopy

On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution 13C NMR Spectroscopy

New prospects and frontiers of nanodiamond clusters

Electron Spin Relaxation in Carbon Materials

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On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution ¹³C NMR Spectroscopy

On The Potential of Dynamic Nuclear Polarization Enhanced Diamonds in Solid‐State and Dissolution ¹³C NMR Spectroscopy