Quantum confinement observed in the x-ray absorption spectrum of size distributed meteoritic nanodiamonds

Berg, T.; Marosits, Edit; Maul, J.; Nagel, Peter; Ott, U.; Schertz, F.; Schuppler, S.; Sudek, Christa; Schönhense, G.

doi:10.1063/1.2978217

Cited by 11 publications

(12 citation statements)

References 32 publications

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“…), Orgueil (Garvie ), and Murchison (Berg et al. ) meteorites. These spectra either do not show a prominent diamond core exciton absorption (Flynn et al.…”

Section: Discussionmentioning

confidence: 99%

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Diamond xenolith and matrix organic matter in the Sutter's Mill meteorite measured by C‐XANES

Kebukawa

Zolensky

Kilcoyne

et al. 2014

Meteorit & Planetary Scien

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The Sutter's Mill (SM) meteorite fell in El Dorado County, California, on April 22, 2012. This meteorite is a regolith breccia composed of CM chondrite material and at least one xenolithic phase: oldhamite. The meteorite studied here, SM2 (subsample 5), was one of three meteorites collected before it rained extensively on the debris site, thus preserving the original asteroid regolith mineralogy. Two relatively large (10 lm sized) possible diamond grains were observed in SM2-5 surrounded by fine-grained matrix. In the present work, we analyzed a focused ion beam (FIB) milled thin section that transected a region containing these two potential diamond grains as well as the surrounding finegrained matrix employing carbon and nitrogen X-ray absorption near-edge structure (C-XANES and N-XANES) spectroscopy using a scanning transmission X-ray microscope (STXM) (Beamline 5.3.2 at the Advanced Light Source, Lawrence Berkeley National Laboratory). The STXM analysis revealed that the matrix of SM2-5 contains C-rich grains, possibly organic nanoglobules. A single carbonate grain was also detected. The C-XANES spectrum of the matrix is similar to that of insoluble organic matter (IOM) found in other CM chondrites. However, no significant nitrogen-bearing functional groups were observed with N-XANES. One of the possible diamond grains contains a Ca-bearing inclusion that is not carbonate. C-XANES features of the diamond-edges suggest that the diamond might have formed by the CVD process, or in a high-temperature and -pressure environment in the interior of a much larger parent body.

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“…), Orgueil (Garvie ), and Murchison (Berg et al. ) meteorites. These spectra either do not show a prominent diamond core exciton absorption (Flynn et al.…”

Section: Discussionmentioning

confidence: 99%

“…; Garvie ), or the exciton peak is largely broadened and blueshifted (Berg et al. ). The absence of the diamond exciton in these meteoritic nanodiamonds may result from the size effect (Chang et al.…”

Section: Discussionmentioning

confidence: 99%

Diamond xenolith and matrix organic matter in the Sutter's Mill meteorite measured by C‐XANES

Kebukawa

Zolensky

Kilcoyne

et al. 2014

Meteorit & Planetary Scien

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“…EELS combined with scanning TEM (STEM) can even provide mapping or profiles of impurities with an atomic resolution [63][64][65]. Near-edge X-ray absorption fine structure (NEXAFS) technique could probe the local bonding environment [66]. Nuclear Magnetic Resonance permits to probe hydrogen ( 1 H), nitrogen ( 15 N) and carbon ( 13 C) spins [67].…”

Section: Diamond Corementioning

confidence: 99%

Surface Modifications of Nanodiamonds and Current Issues for Their Biomedical Applications

Arnault

2014

Topics in Applied Physics

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Combining numerous unique assets, nanodiamonds are promising nanoparticles for biomedical applications. The present chapter focuses on the current knowledge of their properties. It shows how the control of their surface chemistry governs their colloidal behavior. This allows a fine tuning of their surface charge. Developments of bioapplications using nanodiamonds are summarized and further promising challenges for biomedicine are discussed.

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“…Similar frequency shifts, broad bands (10-20 cm −1 at FWHM), and relatively high background fluorescence were observed in impact-induced diamond as well as in nanodiamond samples from different shock metamorphic environments such as terrestrial impact structures (El Goresy et al 2001) and meteorites (Greshake et al 2000, Mostefaoui et al 2002 as well as in shock recovery experiments (Kenkmann et al 2002). We note, however, that the frequency shift of the band at 1332 cm −1 and the peak broadening from higher modes to the lower ones may also be assigned to the effects of phonon / quantum confinement (Yoshikawa et al 1995, Chen et al 1999, Sun et al 2000, Berg et al 2008. Shifts were also observed after irradiation by neutrons (Guo et al 2004).…”

Section: Discussionmentioning

confidence: 79%

Micro-Raman study of nanodiamonds from Allende meteorite

et al. 2008

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Abstract. We have studied the Raman spectroscopic signatures of nanodiamonds from the Allende meteorite in which some portions must be of presolar origin as indicated by the isotopic compositions of various trace elements. The spectra of the meteoritic nanodiamond show a narrow peak at 1326 cm −1 and a broad band at 1590 cm −1 . Compared to the intensities of these peaks, the background fluorescence is relatively high. A significant frequency shift from 1332 to 1326 cm −1 , peak broadening, and appearance of a new peak at 1590 cm −1 might be due to shock effects during formation of the diamond grains. Such changes may have several origins: an increase in bond length, a change in the electron density function or charge transfer, or a combination of these factors. However, Raman spectroscopy alone does not allow distinguishing between a shock origin of the nanodiamonds and formation by a CVD process as is favored by most workers.

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Quantum confinement observed in the x-ray absorption spectrum of size distributed meteoritic nanodiamonds

Cited by 11 publications

References 32 publications

Diamond xenolith and matrix organic matter in the Sutter's Mill meteorite measured by C‐XANES

Diamond xenolith and matrix organic matter in the Sutter's Mill meteorite measured by C‐XANES

Surface Modifications of Nanodiamonds and Current Issues for Their Biomedical Applications

Micro-Raman study of nanodiamonds from Allende meteorite

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