Investigation of relaxation of nanodiamond surface in real and reciprocal spaces

Pałosz, B.; Pantea, Cristian; Grzanka, Ewa; Stelmakh, S.; Proffen, Thomas; Żerda, T. W.; Pałosz, W.

doi:10.1016/j.diamond.2006.09.001

Cited by 66 publications

(40 citation statements)

References 11 publications

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“…tensor of the P1-centers in the nanodiamond observed in the present work also may be explained by a distortion of the diamond lattice. Our data are consistent with the model of nanodiamond proposed in [35,36]. According to [35,36], there is a core with a perfect diamond lattice which is surrounded by a shell of compressed diamond lattice, and this core-shell structure is enveloped in a nondiamond carbon.…”

Section: Methodssupporting

confidence: 79%

“…Our data are consistent with the model of nanodiamond proposed in [35,36]. According to [35,36], there is a core with a perfect diamond lattice which is surrounded by a shell of compressed diamond lattice, and this core-shell structure is enveloped in a nondiamond carbon. Recent NMR data [11] showed the presence of nitrogen atoms in the shell of nanodiamond particle, not in the core.…”

Section: Methodssupporting

confidence: 79%

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Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

Fionov

Lund

Chen

et al. 2010

Chemical Physics Letters

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Dispersed detonation nanodiamonds have been studied by continuous-wave (CW) and pulse EPR techniques. The spectrum of bulk radicals (g = 2.0025 ± 0.0002, a Lorentz line shape with ΔH pp = 0.95 ± 0.05 mT) dominated in CW EPR and prevented to record spectra from other paramagnetic species. The pulse EPR spectrum was the superposition of the distorted P1-center spectrum with parameters (g = 2.0025, A xx = 2.57 mT, A yy = 3.08 mT, A zz = 4.07 mT), the H1-center spectrum (g = 2.0028) and the single line (g = 2.0025, ΔH pp = 0.40 ± 0.05 mT) from other centers which may be assigned to surface radicals. The concentration of P1-centers has been estimated by CW EPR as 2 ± 1 ppm N.

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Section: Methodssupporting

confidence: 79%

Section: Methodssupporting

confidence: 79%

Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

Fionov

Lund

Chen

et al. 2010

Chemical Physics Letters

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“…Both plots can be used for examination of the core-shell structure of a nanocrystal. While alp-Q dependencies were already used for evaluation of core-shell models of nanocrystals [9][10][11][12][13], we are not aware of any earlier attempt to use PDF analysis for examination of the core-shell structure of nanocrystals; although plots of relative changes Dr i =r i have been measured experimentally for diamond and SiC [18], they were not used for evaluation of core-shell models.…”

Section: Distribution Of Individual Inter-atomic Distances At Pdf Plotmentioning

confidence: 99%

“…The solution might be in the analysis of the experimental alp-Q relation through seeking a model which gives theoretical alp-Q dependence similar to the experimental one. We used this approach for evaluation of the core-shell structure of nanocrystalline diamond and SiC [10][11][12][13]; the methodology of doing such an alp-Q analysis has been published previously [9] and is not discussed here.…”

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confidence: 99%

Nanocrystals: Breaking limitations of data analysis

Pałosz¹,

Grzanka

Gierlotka

et al. 2010

Zeitschrift für Kristallographie

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Abstract. A series of "virtual powder diffraction experiments" was made on models of small single crystals and nanocrystals with the core-shell structure. The results of those experiments were elaborated with application of standard methods of data analysis routinely used for reciprocal and real space analyses of polycrystalline materials. It is shown that the assumption of a uniform crystal structure of nano-materials is not justified and, therefore, application of routine procedures of collection and elaboration of diffraction data may lead to misinterpretation of the experiments and to incorrect conclusions about their structure. Tentative ways of using powder diffraction data to learn about the structure of nanocrystals with different atomic architecture of the core and of the surface of the grains are discussed. A need for elaboration of a model of the atomic structure of an individual nanograin with a non-uniform structure is discussed. An alternative approach to diffraction studies of nanocrystals by presenting the "footprints" of materials under study in the form of plots showing distribution of the experimental apparent lattice parameters as a function of diffraction vector Q, or bond length distribution as a function of r-distances derived from PDF function is suggested.

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“…In the case of NVs in 5-nm detonation nanodiamonds, the blinking may therefore be a manifestation of the local crystal disorder. An NV centre is situated in a 5-nm crystal comprising a crystalline diamond core sized 2-3 nm and a mixed sp 2 -sp 3 hybridization shell of quasi-spherical shape 27 distorted by the large proportion of surface dangling bonds ( 20% of total carbon atoms) 28 , dislocations 29 and impurities. The outer shell has been found to regain some sp 3 hybridization by surface passivation, for example, with oxygen-containing moieties 28,30 , as in the present study.…”

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confidence: 99%

Observation and control of blinking nitrogen-vacancy centres in discrete nanodiamonds

et al. 2010

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Nitrogen-vacancy colour centres in diamond can undergo strong, spin-sensitive optical transitions under ambient conditions, which makes them attractive for applications in quantum optics 1 , nanoscale magnetometry 2,3 and biolabelling 4 . Although nitrogen-vacancy centres have been observed in aggregated detonation nanodiamonds 5 and milled nanodiamonds 6 , they have not been observed in very small isolated nanodiamonds 7 . Here, we report the first direct observation of nitrogen-vacancy centres in discrete 5-nm nanodiamonds at room temperature, including evidence for intermittency in the luminescence (blinking) from the nanodiamonds. We also show that it is possible to control this blinking by modifying the surface of the nanodiamonds.Detonation nanodiamond is routinely produced on an industrial scale, and the raw material can be disintegrated into a stable 5-nm monodisperse colloid 8 . The combination of inert core and chemically reactive surface, which can host a variety of moieties, is appealing for chemists, biologists and material scientists 9,10 . Quantum magnetometry 2,3 is an example of an emerging technology that will directly benefit from the availability of nanocrystals with welldefined sizes in the 5-nm range, because the sensitivity to single spins is inversely proportional to the cube of the distance between the sensor (that is, the nitrogen-vacancy (NV) centre) and the spin being detected.Producing and detecting NV colour centres in isolated 5-nm detonation nanodiamond has been controversial, and there has been some scepticism regarding their stability as a useful emitter in a discrete crystal. For example, theoretical calculations of the crystal energy budget favour the location of nitrogen on the surface rather than in the core, which seems to explain the limited observation of NV centres in chemical vapour deposition and high-pressure high-temperature grains of less than 40 nm in size 11,12 , and favours the prediction that nanodiamonds smaller than 10 nm in size do not contain NV centres 7,13 . Although sub-10-nm nanodiamonds with NV centres have been produced using a top-down approach (milling luminescent high-pressure hightemperature microdiamonds into 7-nm particles 6,14 ), the question of NV stability in isolated detonation nanodiamonds persists.In aggregated detonation nanodiamonds (agglomerates and agglutinates 8 ), high-sensitivity, time-gated luminescence and electronic paramagnetic resonance spectroscopy have been used to extract a weak NV signal from a strong luminescence background 5 . The experiments highlight the eclipsing nature of the graphitic surface layers in nanodiamond aggregates-NV centres were simply not visible through the broadband luminescence from the surface and grain boundary material. To distinguish the NV spectral signature from the large grain boundary luminescence overhead, diamond synthesis yielding discrete sub-10-nm detonation nanodiamonds is vital. Here, we use a robust deaggregation and dispersion method, which diminishes the crystal-crystal interaction to...

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Investigation of relaxation of nanodiamond surface in real and reciprocal spaces

Cited by 66 publications

References 11 publications

Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

Nanocrystals: Breaking limitations of data analysis

Observation and control of blinking nitrogen-vacancy centres in discrete nanodiamonds

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