UV Raman characteristics of nanocrystalline diamond films with different grain size

Sun, Zhuo; Shi, Jing; Tay, Beng Kang; Lau, Shu Ping

doi:10.1016/s0925-9635(00)00349-6

Cited by 177 publications

(86 citation statements)

References 13 publications

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“…28 Another small peak is visible in some of the spectra centred at ~1555 Raman analysis of films grown with Ar and He dilution revealed the presence of peaks and relative intensities consistent with that expected for nanocrystalline diamond. 28,30,31 Broadened and shifted diamond lines (1333 cm -1 ) in all the films suggest a reduction in the grain size and high compressive stress 32 from the phonon confinement model. 26,33 This is expected to occur in nanocrystalline diamond and has been observed previously in nanocrystalline diamond films.…”

Section: Diamond and Non-diamond Carbonmentioning

confidence: 87%

The role of C2 in nanocrystalline diamond growth

Rabeau

Fan

John

et al. 2004

Journal of Applied Physics

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This paper presents findings from a study of nanocrystalline diamond (NCD) growth in a microwave plasma chemical vapour deposition (CVD) reactor. NCD films were grown using Ar/H 2 /CH 4 and He/H 2 /CH 4 gas compositions. The resulting films were characterised using Raman spectroscopy, scanning electron microscopy and atomic force microscopy. Analysis revealed an estimated grain size of the order of 50 nm, growth rates in the range 0.01 to 0.3 µm/h and sp 3 and sp 2 bonded carbon content consistent with that expected for NCD.The C 2 Swan band (d 3 П g ↔ a 3 П u ) was probed using cavity ring-down spectroscopy (CRDS) to measure the absolute C 2 (a) number density in the plasma during diamond film growth.The number density in the Ar/H 2 /CH 4 plasmas was in the range 2 to 4 x 10 12 cm -3 , but found to be present in quantities too low to measure in the He/H 2 /CH 4 plasmas. Optical emission 2 spectrometry (OES) was employed to determine the relative densities of the C 2 excited state (d) in the plasma.The fact that similar NCD material was grown whether using Ar or He as the carrier gas suggests that C 2 does not play a major role in the growth of nanocrystalline diamond.3

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Section: Diamond and Non-diamond Carbonmentioning

confidence: 87%

The role of C2 in nanocrystalline diamond growth

Rabeau

Fan

John

et al. 2004

Journal of Applied Physics

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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: 74%

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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“…38,39 There also exist peaks at around 1140 cm 1 and 1520 cm 1 , which are ascribed to the ν 1 and ν 3 modes of trans-polyacetylene (t-PA) phase present in the grain boundaries. 40 It is to be noted that the sharp Raman peak at 1334 cm 1 corresponding to the F2g zone center optical phonon of diamond is not clearly observable in this Raman spectrum as micro-Raman spectroscopy is overwhelmingly more sensitive to sp 2 sites. The patterning process for making NCD pads does not change the bonding structure for NCD materials profoundly such that the Raman spectrum of NCD pads [spectrum II of Fig.…”

Section: -2mentioning

confidence: 81%

Vertically aligned diamond-graphite hybrid nanorod arrays with superior field electron emission properties

et al. 2017

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A “patterned-seeding technique” in combination with a “nanodiamond masked reactive ion etching process” is demonstrated for fabricating vertically aligned diamond-graphite hybrid (DGH) nanorod arrays. The DGH nanorod arrays possess superior field electron emission (FEE) behavior with a low turn-on field, long lifetime stability, and large field enhancement factor. Such an enhanced FEE is attributed to the nanocomposite nature of the DGH nanorods, which contain sp2-graphitic phases in the boundaries of nano-sized diamond grains. The simplicity in the nanorod fabrication process renders the DGH nanorods of greater potential for the applications as cathodes in field emission displays and microplasma display devices.

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UV Raman characteristics of nanocrystalline diamond films with different grain size

Cited by 177 publications

References 13 publications

The role of C2 in nanocrystalline diamond growth

The role of C2 in nanocrystalline diamond growth

Micro-Raman study of nanodiamonds from Allende meteorite

Vertically aligned diamond-graphite hybrid nanorod arrays with superior field electron emission properties

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