Electronic and atomic structure of evaporated carbon films

Schelz, S.; Richmond, Thomas G.; Kania, P.; Oelhafen, P.; Güntherodt, H.‐J.

doi:10.1016/0039-6028(96)00364-0

Cited by 55 publications

(26 citation statements)

References 20 publications

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“…Its presence indicates irregular stacking in the graphite nanocrystallites, which inhibits the perfect extinction of the (001) reflection [31]. In consequence, the peak is significantly broadened, or very small nanocrystallites of a few nanometers in diameter [32]. Adjusting a Lorentzian peak yields a width of 2.1°, corresponding to a dispersion of Δc = ±0.5 Å.…”

Section: Cohesive and Structural Properties Of The Graphite Layermentioning

confidence: 99%

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Pinyol¹,

Meylan²,

Gilliéron³

et al. 2009

Thin Solid Films

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An electro-fragmentation method was developed as a fast alternative to the time consuming fragmentation test carried out in situ in a microscope, to investigate the failure of dielectric inorganic coatings on polymer substrates. An ultrathin conductive layer was used to probe the onset of tensile failure in the dielectric coating through changes of its electrical resistance. A careful selection of the conductive layer has been carried out to avoid artifacts resulting for instance from a change of the cohesive properties (e.g. internal stress state) of the investigated structures. Au layers were found to be too ductile, contrary to Al-Ti layers that were too brittle, which invalidated the use of both materials to probe the failure of the dielectric coatings. In contrast, for structures on high-temperature polymer substrates, a 10 nm thick amorphous graphite (a-G) layer was found to accurately reproduce the cracking of the coating. The Young's modulus and coefficient of thermal expansion of the a-G layer are low enough not to impact the internal strain, hence the crack onset strain of the dielectric coating. The a-G layer is also sufficiently brittle, and its cohesive failure and resulting increase of electrical resistance is triggered by the failure of the dielectric coating. The a-G electro-fragmentation method is presently limited to polymers substrates with a glass-transition temperature higher than 100°C.

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Section: Cohesive and Structural Properties Of The Graphite Layermentioning

confidence: 99%

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Pinyol¹,

Meylan²,

Gilliéron³

et al. 2009

Thin Solid Films

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“…Renishaw Raman spectrometer was used, and the wavelength and the power of the laser were kept at 514 nm and 50 mW, respectively. The D-peak relative intensity (I D /I G ) of 1.43 and the G-peak FWHM of 120 cm À1 suggest that both sp3 bonds fraction and the grain size of www.elsevier.com/locate/apsusc Applied Surface Science 253 (2007) 9073-9076 graphite in the film are rather small, so the film deposited by EB evaporation is a typical amorphous carbon film [5,11].…”

Section: Resultsmentioning

confidence: 99%

Field emission from nano-patterned amorphous carbon

Wang

2007

Applied Surface Science

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“…There is still disorder in the system at this stage, as revealed by the C 1s width, which is higher (1.4 eV) than for graphite (1 eV, as measured, under the same experimental conditions, using the same instrument). However, the graphitelike cluster dimensions must be high enough (10-20 nm) 17 to allow the C 1s BE and asymmetry to reach the graphite values.…”

Section: Discussionmentioning

confidence: 99%

An electron spectroscopy study of a‐C:H under thermal annealing

Calliari

Filippi

Gottardi

et al. 2006

Surface & Interface Analysis

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The structural changes brought about in hydrogenated amorphous carbon (a-C : H) by thermal annealing are investigated by photon-induced electron spectroscopy. The material is found to be stable up to T = 100°C. From 100 to 400°C, H effusion is associated with sp 3 to sp 2 conversion, as revealed by the evolution of the valence states. From 400 to 700°C, the sp 2 sites gather into clusters of increasing size, as revealed by the decreasing binding energy (BE) and increasing asymmetry of the C 1s spectrum.

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Electronic and atomic structure of evaporated carbon films

Cited by 55 publications

References 20 publications

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Field emission from nano-patterned amorphous carbon

An electron spectroscopy study of a‐C:H under thermal annealing

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