The mystery of the 1140 cm−1 Raman line in nanocrystalline diamond films

Kuzmany, H.; Pfeiffer, R.; Salk, Natalie; Günther, B.

doi:10.1016/j.carbon.2003.12.045

Cited by 333 publications

(163 citation statements)

References 22 publications

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“…The D position, G position and the G peak FWHM are indicated in table 1. This peak shape is consistent with the deposition of high sp 3 DLC [6]. The sp 3 fractions for the pure carbon films come to around 70% [13].…”

Section: Raman Spectroscopysupporting

confidence: 84%

“…One of its advantages is its near tissue equivalence [1][2][3][4][5][6] where its atomic number is comparable to that of human tissue (Z=6 for diamond and Z≈7.5 for human tissues). Thus the energy absorbed by diamond is similar to that absorbed by human tissue, which reduces the need for correction mechanisms as with other semiconductor materials [6]. Its high bandgap (5.5 eV) [1,3,[7][8][9] ensures a low dark current and hence a low background noise.…”

Section: Introductionmentioning

confidence: 99%

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The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

Abdel‐Rahman

Lohstroh

Jayawardena

et al. 2012

Diamond and Related Materials

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Section: Raman Spectroscopysupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

Abdel‐Rahman

Lohstroh

Jayawardena

et al. 2012

Diamond and Related Materials

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“…It was shown in the works of many authors, 36,37,43,44 including us, 20 that the 1140 cm −1 Raman peak is attributed to C u H bending mode of sp 2 carbon and positioned most likely in the diamond grain boundary. Both peaks ͑Raman 1140 cm −1 and HR-EELS ϳ375 meV mode͒ are attributed to ͑sp 2 ͒-carbon-hydrogen vibration.…”

Section: Hydrogen Bonding Configuration On Diamond Film Surface Stmentioning

confidence: 87%

Hydrogen concentration and bonding configuration in polycrystalline diamond films: From micro-to nanometric grain size

Michaelson

Ternyak

Akhvlediani

et al. 2007

Journal of Applied Physics

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The present work studies the incorporation of hydrogen and its bonding configuration in diamond films composed of diamond grains of varying size which were deposited by three different methods: hot filament ͑HF͒, microwave ͑MW͒, and direct current glow discharge ͑dc GD͒ chemical vapor deposition ͑CVD͒. The size of diamond grains which constitute the films varies in the following way: hundreds of nanometers in the case of HF CVD ͑"submicron size," ϳ300 nm͒, tens of nanometers in the case of MW CVD ͑3-30 nm͒, and a few nanometers in the case of dc GD CVD ͑"ultrananocrystalline diamond," ϳ5 nm͒. Raman spectroscopy, secondary ion mass spectroscopy, and high resolution electron energy loss spectroscopy ͑HR-EELS͒ were applied to investigate the hydrogen trapping in the films. The hydrogen retention of the diamond films increases with decreasing grain size, indicating that most likely, hydrogen is bonded and trapped in grain boundaries as well as on the internal grain surfaces. Raman and HR-EELS analyses show that at least part of this hydrogen is bonded to sp 2 -and sp 3 -hybridized carbon, thus giving rise to typical C u H vibration modes. Both vibrational spectroscopies show the increase of ͑sp 2 ͒-C u H mode intensity in transition from submicron to ultrananocrystalline grain size. The impact of diamond grain size on the shape of the Raman and HR-EELS hydrogenated diamond spectra is reported and discussed.

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“…These peaks are sometimes related to acetylene C-H chains. The considerable increase of the peak at 1136 cm À1 , in small grain size sample in comparison to large grain size samples, indicates the increase of a relative fraction of hydrogen in grain boundaries of the sample [30]. Diamond peak around 1334 cm À1 is not sharp and also the intensity ratio of graphite (I g ) to diamond (I d ) phase has increased (Table 2).…”

Section: Methodsmentioning

confidence: 95%

“…These peaks are sometimes related to acetylene C-H chains. The considerable increase of the peak at 1136 cm À1 , in small grain size in comparison to large size samples, indicates the increase of a relative fraction of hydrogen in grain boundaries of the sample [30]. As the number of grain boundaries increase due to decrease in grain size, the possibility of incorporated hydrogen bonded with/without carbon at the grain boundary region increases.…”

Section: Methodsmentioning

confidence: 96%

Correlation between diamond grain size and hydrogen incorporation in nanocrystalline diamond thin films

Rakha

Gao

Cao

2012

Journal of Experimental Nanoscience

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Hydrogen-incorporated nanocrystalline diamond thin films have been deposited in microwave plasma enhanced chemical vapour deposition (CVD) system with various hydrogen concentrations in the Ar/CH 4 gas mixture. The bonding environment of carbon atoms was detected by Raman spectroscopy and the hydrogen concentration was determined by elastic recoil detection analysis. Incorporation of H 2 species into Ar-rich plasma was observed to markedly alter the microstructure of diamond films. Raman spectroscopy results showed that part of the hydrogen is bonded to carbon atoms. Raman spectra also indicated the increase of non-diamond phase with the decrease in crystallite size. The study addresses the effects of hydrogen trapping in the samples when hydrogen concentration in the plasma increased during diamond growth and its relation with defective grain boundary region.

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The mystery of the 1140 cm−1 Raman line in nanocrystalline diamond films

Cited by 333 publications

References 22 publications

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

The X-ray detection performance of polycrystalline CVD diamond with pulsed laser deposited carbon electrodes

Hydrogen concentration and bonding configuration in polycrystalline diamond films: From micro-to nanometric grain size

Correlation between diamond grain size and hydrogen incorporation in nanocrystalline diamond thin films

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