Evidence for trans-polyacetylene in nano-crystalline diamond films

Pfeiffer, R.; Kuzmany, H.; Knöll, P.; Bokova, S. N.; Salk, Natalie; Günther, B.

doi:10.1016/s0925-9635(02)00336-9

Cited by 198 publications

(77 citation statements)

References 12 publications

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“…Raman spectroscopy analysis of the present hot filament-grown NCD films (Fig. 1C) revealed their composite nature, attested by the occurrence of the diamond peak combined with the graphitic peak and the typical bands of nanometric diamond (m = 1228 cm À1 [31]; m = 1140 and 1480 cm À1 [32,33]). In addition, NCD films are formed by diamond crystals of nanometric size, usually between 10 and 100 nm [34,35].…”

Section: Discussionmentioning

confidence: 81%

Cytotoxicity evaluation of nanocrystalline diamond coatings by fibroblast cell cultures

et al. 2009

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Section: Discussionmentioning

confidence: 81%

Cytotoxicity evaluation of nanocrystalline diamond coatings by fibroblast cell cultures

et al. 2009

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“…22,23 Since Raman spectroscopy is usually more sensitive to sp 2 carbon phases, some enhancement in G peak intensity may be expected following t-PA bonding decomposition. However, Ferrari and Robertson noted that the rest of the spectrum is substantially unchanged following 1200°C annealing, 22 while in the work of Pfeiffer et al 62 following 1200°C annealing the diamond 1332 cm −1 line is even more pronounced, than for asdeposited films. Present NEXAFS measurements confirm Raman results revealing at most only minor bulk graphitization of the film.…”

Section: Discussion Of Nanodiamond Bulk Versus Surface Thermal Stamentioning

confidence: 92%

Bulk and surface thermal stability of ultra nanocrystalline diamond films with 10–30 nm grain size prepared by chemical vapor deposition

Michaelson

Stacey

Orwa

et al. 2010

Journal of Applied Physics

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The thermal stability of nanocrystalline diamond films with 10–30 nm grain size deposited by microwave enhanced chemical vapor deposition on silicon substrate was investigated as a function of annealing temperature up to 1200 °C. The thermal stability of the surface-upper atomic layers was studied with near edge x-ray absorption fine structure (NEXAFS) spectroscopy recorded in the partial electron yield mode. This technique indicated substantial thermally induced graphitization of the film within a close proximity to the surface. While in the bulk region of the film no graphitization was observed with either Raman spectroscopy or NEXAFS spectroscopy recorded in total electron yield mode, even after annealing to 1200 °C. Raman spectroscopy did detect the complete disappearance of transpolyacetylene (t-PA)-like ν1 and ν3 modes following annealing at 1000 °C. Secondary ion mass spectroscopy, applied to investigate this relative decrease in hydrogen atom concentration detected only a ∼30% decrease in the bulk content of hydrogen atoms. This enhanced stability of sp3 hybridized atoms within the bulk region with respect to graphitization is discussed in terms of carbon bond rearrangement due to the thermal decomposition of t-PA-like fragments.

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“…Meanwhile, weak shoulder peaks at 1143 cm −1 and 1496 cm −1 can be observed, which are related to the transpolyacetylene (TPA) segments at the grain boundaries of the nano-crystalline diamond. These can be a convenient probe for nano-crystalline diamond thin lms [20][21][22] . The peak at 1568 cm −1 (G band) is related to the vibration of the sp 2 -bonded carbon atoms in a two-dimensional hexagonal lattice, corresponding to the E 2g mode of graphite.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Nano-Crystalline Diamond Duplex Micro-Gear by Hot Filament Chemical Vapor Deposition

Wang

Zuo

et al. 2017

Mater. Trans.

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Chemical vapor deposition (CVD) diamond micro-components are attracting considerable interest due to their exceptional properties and potential applications. Micro-gears are an important actuating component in micro-machines or micro-electromechanical systems. In this study, nano-crystalline diamond duplex micro-gears for micro-machine applications have been fabricated by combining hot lament CVD (HFCVD) with inductively coupled plasma etching. Based on scanning electron microscopy, X-ray diffraction, and micro-Raman spectroscopy observations, the nano-crystalline diamond duplex micro-gears produced by HFCVD are found to be faithful replicas of microstructure silicon molds produced by time-multiplexed deep etching. The fabricated duplex micro-gear consists of two gears. A gear with 14 teeth constitutes the top layer and has root and tip diameters of 1.14 mm and 1.52 mm, respectively, while the second 20-tooth gear constitutes the bottom layer and has root and tip diameters of 1.75 mm and 2.20 mm, respectively. The total thickness of the micro-gear is about 20 μm.

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Evidence for trans-polyacetylene in nano-crystalline diamond films

Cited by 198 publications

References 12 publications

Cytotoxicity evaluation of nanocrystalline diamond coatings by fibroblast cell cultures

Cytotoxicity evaluation of nanocrystalline diamond coatings by fibroblast cell cultures

Bulk and surface thermal stability of ultra nanocrystalline diamond films with 10–30 nm grain size prepared by chemical vapor deposition

Fabrication of Nano-Crystalline Diamond Duplex Micro-Gear by Hot Filament Chemical Vapor Deposition

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