Influence of annealing on the hydrogen bonding and the microstructure of diamondlike and polymerlike hydrogenated amorphous carbon films

Bounouh, Y.; Thèye, M. L.; Dehbi-Alaoui, A.; Matthews, A.; Stoquert, J.P.

doi:10.1103/physrevb.51.9597

Cited by 99 publications

(50 citation statements)

References 18 publications

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“…The band is probably dominated by the CH 2 band contribution, which appeared to broaden upon environmental constraints. This result is consistent with the IR analysis in typical a-C:H samples (Bounouh et al 1995;Dartois et al 2005).…”

Section: A40 Page 4 Of 14supporting

confidence: 80%

“…5 and reveal the richness of the vibrational bands. The band assignments are based on literature data for a-C:H (Bounouh et al 1995;Ristein et al 1998;Dartois et al 2005), soot (Galvez et al 2002;Santamaría et al 2006) and natural carbonaceous materials such as coals (Ibarra et al 1996;Geng et al 2009). The region around 3000 cm −1 corresponds to the CH stretching modes, the one around 1600 cm −1 to the C=C (sp 2 ) stretching modes, the one between 1500 and 1000 cm −1 to the CH bending and C-C (sp 3 ) stretching motions with some contributions of sp 2 C=C modes, and finally the 1000−720 cm −1 region corresponds to the CH "out-of-plane" (wagging) bending motions.…”

Section: A40 Page 4 Of 14mentioning

confidence: 99%

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Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7μm AIBs

Carpentier

Féraud

Dartois

et al. 2012

A&A

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Section: A40 Page 4 Of 14supporting

confidence: 80%

Section: A40 Page 4 Of 14mentioning

confidence: 99%

Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7μm AIBs

Carpentier

Féraud

Dartois

et al. 2012

A&A

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“…8,9 Conventional techniques to alter the sp 2 content for a-C:H films are by varying the deposition parameters such as dc self-bias, 10 through the addition of N 11 or through thermal annealing. 12 Conventional annealing results in a macroscopic sp 2 restructuring of the film, and the formation of larger and larger sp 2 clusters. An alternative approach is to perform localized heating by means of ion implantation, whereby it is possible to deposit highly localized energy in a controlled manner.…”

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confidence: 99%

Electron delocalization in amorphous carbon by ion implantation

et al. 2001

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The electrical properties of amorphous carbon are governed by the high localization of the sp 2 states, and conventional methods of altering the sp 2 content result in macroscopic graphitization. By using ion beams we have achieved a delocalization of the states by introducing nanoclustering and hence improving the connectivity between existing clusters, as demonstrated by the increase in the conductivity by two orders of magnitude without modification of the band gap. At higher doses, paramagnetic relaxation-time measurements indicate that exchange effects are present. This unveils the possibility of amorphous carbon-based electronics by tailoring the ion-beam conditions, which we demonstrate in the form of a rectifying device.

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“…The major hindrance to the quantitative analysis of infrared absorption has been the dif®culty in baseline determination, which becomes harder as thicker ®lms are used to enhance the absorption features. In spite of successful baseline determination with an approximate transmission equation in few cases, the applicability of the same approximation for much thicker ®lms is unclear [6,9]. Moreover, the dispersion of refractive index in mid-infrared range, which has to be taken into consideration to optimise antire¯ection conditions for a particular wavelength, has not been discussed in those cases.…”

Section: Introductionmentioning

confidence: 99%

Wide wavelength-range optical studies of hydrogenated amorphous carbon films: from 700 nm to 10 μm

Choi

Lee

et al. 2001

Applied Surface Science

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Hydrogenated amorphous carbon (a-C:H) ®lms were deposited on double-side polished germanium substrates by RF plasma-assisted chemical vapour deposition method using benzene as a precursor, and their optical properties were investigated in the wavelength range from 700 nm to 10 mm. In particular, we used a dispersion-function-based non-linear regression to ®t the re¯ectance in the range from 700 to 1800 nm and the baselines of the infrared transmittance in the range from 1000 to 5000 cm À1 , respectively. Optical constants determined in both ranges, together with their respective thickness values, showed overall consistency. As a function of self-bias, we found that the refractive index increased while the band gap decreased, which was indicative of ®lm densi®cation and increase of sp 2 -bonded carbons. Detailed information on the selfbias-dependent evolution of microscopic bonding structure in a-C:H ®lms was revealed via the quantitative vibrationabsorption spectra in the mid-infrared region, which was obtained after taking Urbach-tail-like electronic absorption into consideration. More speci®cally, it was found that as self-bias was increased hydrogen content decreased, ole®nic sp 2 -bonding decreased while aromatic sp 2 -bonding increased, and more carbon bonding was distorted due to increased cross-linking. Maximum sp 2 -bonding was observed between À300 and À400 V of self-bias. #

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Influence of annealing on the hydrogen bonding and the microstructure of diamondlike and polymerlike hydrogenated amorphous carbon films

Cited by 99 publications

References 18 publications

Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7μm AIBs

Nanostructuration of carbonaceous dust as seen through the positions of the 6.2 and 7.7μm AIBs

Electron delocalization in amorphous carbon by ion implantation

Wide wavelength-range optical studies of hydrogenated amorphous carbon films: from 700 nm to 10 μm

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