Raman Studies of Nano‐ and Ultra‐nanocrystalline Diamond Films Grown by Hot‐Filament CVD

Klauser, Frederik; Steinmüller‐Nethl, Doris; Kaindl, Reinhard; Bertel, E.; Memmel, N.

doi:10.1002/cvde.200906827

Cited by 127 publications

(93 citation statements)

References 44 publications

(28 reference statements)

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“…In this case, there are also three peaks or bands present at 950 cm is measured. This peak is related to trans-polyacetylenelike fragments [18], and with other peaks at 1331 cm −1 , 1350 cm −1 and 1580 cm −1 is observed in the spectra of a nanocrystalline diamond films. Moreover, in comparison with Raman spectra of short-time deposition, the diamond peak at 1331 cm −1 became sharper and higher than the Gband, which is the evidence of high-quality diamond film.…”

Section: Resultssupporting

confidence: 52%

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Study of diamond film nucleation by ultrasonic seeding in different solutions

et al. 2011

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Ê Ú ¿½ Ñ Ö ¾¼½¼ ÔØ ½ Ë ÔØ Ñ Ö ¾¼½½ ×ØÖ ØIn this study we have investigated diamond nucleation on Si substrates by ultrasonic seeding with different liquid solutions of Ultradispersed Detonation Diamond (UDD) powder in a mixture of metal nano-or microparticles (Ni, Co, Y). The influence of different solutions on nucleation efficiency was investigated. For highlighting nucleation centers and better evaluation of the nucleation process the nucleated samples were moved into a Microwave Plasma Enhanced Chemical Vapor Deposition (MW CVD) reactor and a "short-time" (10 min), then followed by a "long-time" (+1 hour), diamond deposition was performed. The morphology of samples was characterized by Scanning Electron Microscopy (SEM) and the chemical composition of grown diamond layer was investigated by Raman Spectroscopy. From the measurements we found out that microsized metal particles positively influenced nucleation and the uniformity of the deposited diamond thin film. The lowest surface roughness was achieved in the case of nanodiamond powder mixed with Co and Y metal powder.

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Section: Resultssupporting

confidence: 52%

“…The slope in Raman spectra of sample 4 and 5 appeared, which means much lower light scattering on metal particles which are fully covered with diamond layer. In general, the slope is caused by luminescence and hydrogen content present at grain boundaries [18]. Incorporation of metal particles was proved by EDX measurement.…”

Section: Resultsmentioning

confidence: 97%

Study of diamond film nucleation by ultrasonic seeding in different solutions

et al. 2011

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“…These bands are characteristic of disordered graphite (D band) and pure graphite sp 2 (G band), respectively (figure 4-A). The G-peak is due to bond stretching of all pairs of sp 2 configuration atoms in both rings and chains whilst the Dpeak is the shoulder of the G-peak at lower wave numbers due to the presence of the sp 2 aromatic rings [20]. This is due to the sp 2 domains in Si-DLC films decreasing [12].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Characteristic of silicon doped diamond like carbon thin films on surface properties and human serum albumin adsorption

Ahmed

Byrne

Ahmed

2015

Diamond and Related Materials

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Diamond-like carbon (DLC) coatings are useful for creating biocompatible surfaces for medical implants. DLC and silicon doped DLC have been synthesised using plasma enhanced chemical vapour deposition (PECVD). The effects of surface morphology on the interaction of human serum albumin (HSA) with doped and undoped DLC films have been investigated using a range of surface analysis techniques using Raman spectroscopy and atomic force microscopy (AFM). Raman spectra of doped DLC show that silicon doped DLC reduces the growth range of the ID/IG ratio, with a significant red-shift of the G peak position. Following exposure to protein, for undoped DLC the peaks at 1664 cm- 1 and around 1241 cm- 1 can be attributed to amide I and III, respectively, with an increase in the surface morphology of the surfaces giving some indication of the protein structure on the surfaces. Results indicate that HSA exhibit the majority of Î²-sheet during the adsorption on the surfaces. The results showed that the silicon incorporation DLC tends to increase of surface roughness and the adsorbed level of HSA is higher with higher levels of silicon doping of the DLC. Therefore, doping DLC may provide a method of controlling the adsorption of protein. Â© 2015 Elsevier B.V. All rights reserved

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“…9 The anomalous stability of trans-polyacetylene found in the grain boundaries of CVD diamond growth over substrates heated above 980 K has been attributed to some kind of rearrangement of the molecular structure. 7,8 However, our results suggest an alternative explanation, i.e., that polyacetylene should be stable in a carbon-and hydrogenrich environment under high pressure and high temperature.…”

Section: -3mentioning

confidence: 66%

“…5,6 Evidences of hydrocarbons produced at high temperatures, particularly trans-polyacetylene (trans-PA), have also been observed in nanodiamond films growth by chemical vapor deposition (CVD) in hydrogen-rich environments. 7,8 The fact that polyacetylene has been identified in the grain boundaries of CVD diamond is noteworthy, as polyacetylene is known to decompose at temperatures well below that of the CVD substrate. 9 In a previous work a carbon-based material was produced by processing of amorphous carbon films (a-C) deposited on a copper substrate with nanosecond Nd-YAG laser pulses.…”

mentioning

confidence: 99%

Apparatus for processing of samples at high pressures and high temperatures in a fast quenching-rate regime and synthesis of polyacetylene by pulsed laser heating of confined carbon thin films

Andreazza¹,

Perottoni²,

Jornada³

2011

Journal of Applied Physics

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The pulsed laser heating of confined samples followed by ultrafast cooling constitutes an interesting route to explore the production of new phases and compounds. Indeed, in some cases the ultrafast cooling allows retaining at ambient conditions species that were produced under extreme conditions. The experimental setup described in this work allows the heating of thin film samples to temperatures ranging from 1400 to 5500 K, in a controlled and measurable way, with estimated cooling rates in excess of 1011 K·s−1. In this paper, we show that the pulsed laser heating of thin amorphous carbon films deposited on copper substrates leads to the formation of polyacetylene in peak temperatures ranging from 1400 to 2600 K and static pressures between 0.8 and 1.1 GPa. The probable source of hydrogen was tracked to the small amount of water physically adsorbed at the carbon film/copper gasket interface. Because of the fast heating and cooling rate in these experiments, the hydrogen formed by water dissociation at high temperatures does not have enough time to diffuse out of the reaction cell. The results here reported strongly suggest that the evolution and stability of carbon-rich species produced by pulsed-laser heating at high pressure and high temperature critically depends on the capability of hydrogen retention in the reactional system.

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Raman Studies of Nano‐ and Ultra‐nanocrystalline Diamond Films Grown by Hot‐Filament CVD

Cited by 127 publications

References 44 publications

Study of diamond film nucleation by ultrasonic seeding in different solutions

Study of diamond film nucleation by ultrasonic seeding in different solutions

Characteristic of silicon doped diamond like carbon thin films on surface properties and human serum albumin adsorption

Apparatus for processing of samples at high pressures and high temperatures in a fast quenching-rate regime and synthesis of polyacetylene by pulsed laser heating of confined carbon thin films

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