Raman scattering from nanometer-sized diamond

Yoshikawa, Masanobu; Mori, Yuzo; Obata, Hideaki; Maegawa, M.; Katagiri, Gen; Ishida, Hideyuki; Ishitani, A.

doi:10.1063/1.115206

Cited by 240 publications

(127 citation statements)

References 2 publications

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“…2a), the former being significantly shifted to lower wavenumber and broadened. The confinement of optical phonons in nanodiamonds is known to cause a particle size-dependent shift to lower wavenumbers and broadening of the Raman scattering peak for bulk diamond 27 . Using a recently reported model 28 , we simulated Raman spectra as a function of nanodiamond particle size ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

et al. 2013

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Clusters of diamond-phase carbon, known as nanodiamonds, exhibit novel mechanical, optical and biological properties that have elicited interest for a wide range of technological applications. Although diamond is predicted to be more stable than graphite at the nanoscale, extreme environments are typically used to produce nanodiamonds. Here we show that nanodiamonds can be stably formed in the gas phase at atmospheric pressure and neutral gas temperatures o100°C by dissociation of ethanol vapour in a novel microplasma process. Addition of hydrogen gas to the process allows in flight purification by selective etching of the non-diamond carbon and stabilization of the nanodiamonds. The nanodiamond particles are predominantly between 2 and 5 nm in diameter, and exhibit cubic diamond, n-diamond and lonsdaleite crystal structures, similar to nanodiamonds recovered from meteoritic residues. These results may help explain the origin of nanodiamonds in the cosmos, and offer a simple and inexpensive route for the production of high-purity nanodiamonds.

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Section: Resultsmentioning

confidence: 99%

Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

et al. 2013

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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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“…The exponent at d depends on the type of a nanocrystal, for example, in diamond nanocrystals it equals one [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of geometry of nanocrystals on the Raman spectra

Igo¹

2018

Nanosystems: Phys. Chem. Math.

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It is shown that Raman spectra of nanocrystals with complex geometric shape can acquire additional broadening. In order to describe complex geometric shapes of nanocrystals in terms of its influence on the Raman spectrum, a parameter was introduced for the shape -roughness parameter. The roughness is defined as a relative parameter of the presence of additional volume on the faces of the cubic nanocrystal. The calculations for additional broadening of the Raman spectral line were made for 3-10 nm nanodiamonds.

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Raman scattering from nanometer-sized diamond

Cited by 240 publications

References 2 publications

Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

Formation of nanodiamonds at near-ambient conditions via microplasma dissociation of ethanol vapour

Micro-Raman study of nanodiamonds from Allende meteorite

Influence of geometry of nanocrystals on the Raman spectra

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