Location of paramagnetic defects in detonation nanodiamond from proton spin-lattice relaxation data

Panich, A. M.; Sergeev, N. A.; Goren, S. D.

doi:10.1016/j.ssnmr.2019.101624

Cited by 3 publications

(4 citation statements)

References 29 publications

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“…The first absorption peak, which is centered at 276 nm (4.5 eV), is lower than the bandgap of the impurity-free crystalline diamond at 5.5 eV [58]. It is related to the π-π * transition in sp 2 -hybridized carbon atoms in clusters surrounding sp 3 -phase [59]. The second broad, but less pronounced band centered at 390 nm (approx.…”

Section: Spectroscopic Characterization Of Ndsmentioning

confidence: 91%

“…These chains are dimer chains on the facets of a diamond core [60] and edges of the sp 2 -carbon clusters in the shell shown in figure S4 (Supplementary Material). Due to high defectiveness of the shell and the resemblance of this sp 2 -clusters to graphene oxide quantum dots (GOQDs), transition at 4.96 eV, which is higher in energy than π-π * transition (4.50 eV) observed in UV-vis absorbance spectra, may also arise from n-σ * transition in sp 3 -domaines associated with hydroxyls or ethers, as reported in [61]. At higher concentrations of NDs the PL intensity with excitation at energies around 4.96 eV preserves its magnitude indicating that this PL originates from the sp 3 diamond core of NDs.…”

Section: Spectroscopic Characterization Of Ndsmentioning

confidence: 98%

“…N, Si, etc) [1], or intrinsic defects (e.g. lattice vacancies) [2,3] originating from ND synthesis [4,5] and/or post-synthesis treatment [6][7][8]. These defects form so-called color centers, which possess a strong temperature-dependent (SiV [9], GeV [10] color centers) and spin-dependent (NV color centers) photoluminescence (PL) [11], show no blinking [12] or photobleaching [13], demonstrate sensitivity to free radical formation in living cells [14][15][16] and chemical reactions at ambient conditions [17] or changes in pH environment [18].…”

Section: Introductionmentioning

confidence: 99%

“…In PLA NDs, the formation of sp 2 shell around the sp 3 core occurs as the temperature and pressure inside the ablation plume decrease below those required for the sp 3 phase formation [32]. PLA synthesis of NDs in the liquid phase supports the appearance of additional functional groups on the ND surface, simplifying the ND solvation and stabilizing the suspension.…”

Section: Introductionmentioning

confidence: 99%

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Nanodiamond surface as a photoluminescent pH sensor

et al. 2023

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A systematic spectroscopic characterization of highly homogeneous water suspensions of ‘buckydiamonds’ comprising sp3 cubic nanodiamond (ND) core covered with disordered sp2 shell densely decorated with oxygen-containing groups demonstrates the excitation-wavelength-dependent photoluminescence (PL) given by at least four types of specific structures on the ND surface (hydroxyl, C=O containing ketones, carboxylic anhydrides, and carboxyl groups). PL properties of NDs suspensions possess concentration-dependent behavior revealing tendency of NDs to agglomerate. PL of NDs has been found to be strongly sensitive to pH of the environment in wide range of pH values, i.e., 2-11. We disclosed the mechanisms of pH sensitivity of the ‘buckydiamond’ and proved that it can serve as all-optical sensor of tiny pH variations suitable for further exploitation for pH sensing locally in the area where NDs have been delivered for any purpose, e.g., bioimaging or therapeutic needs.

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Section: Spectroscopic Characterization Of Ndsmentioning

confidence: 91%

Section: Spectroscopic Characterization Of Ndsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanodiamond surface as a photoluminescent pH sensor

et al. 2023

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Transition metal atoms grafted on the nanodiamonds surface: Identification and guest–host spin–spin interactions

Gridnev

Osipov

2022

Mendeleev Communications

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Composition and Electronic Structure of La2O3/CNFs@C Core-Shell Nanoparticles with Variable Oxygen Content

Suslova,

Ulyanov,

Kozlov

et al. 2023

Nanomaterials

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La2O3 nanoparticles stabilized on carbon nanoflake (CNF) matrix were synthesized and graphitized to produce core-shell structures La2O3/CNFs@C. Further oxidation of these structures by nitric acid vapors for 1, 3 or 6 h was performed, and surface-oxidized particles La2O3/CNFs@C_x (x = 1, 3, 6) were produced. Bulk and surface compositions of La2O3/CNFs@C and La2O3/CNFs@C_x were investigated by thermogravimetric analysis and X-ray photoelectron spectroscopy. With increasing the duration of oxidation, the oxygen and La2O3 content in the La2O3/CNFs@C_x samples increased. The electronic structures of samples were assessed by electron paramagnetic resonance. Two paramagnetic centers were associated with unpaired localized and mobile electrons and were registered in all samples. The correlation between bulk and surface compositions of the samples and their electronic structures was investigated for the first time. The impact of the ratio between sp2- and sp3-hybridized C atoms, the number and nature of oxygen-containing groups on the surface and the presence and proportion of coordinated La atoms on the EPR spectra was demonstrated.

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Location of paramagnetic defects in detonation nanodiamond from proton spin-lattice relaxation data

Cited by 3 publications

References 29 publications

Nanodiamond surface as a photoluminescent pH sensor

Nanodiamond surface as a photoluminescent pH sensor

Transition metal atoms grafted on the nanodiamonds surface: Identification and guest–host spin–spin interactions

Composition and Electronic Structure of La2O3/CNFs@C Core-Shell Nanoparticles with Variable Oxygen Content

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