Monitoring laser-induced microstructural changes of thin film hydrogenated amorphous carbon (a-C:H) using Raman spectroscopy

Lamberton, R.W.; Morley, Stephen; Maguire, PD; McLaughlin, James

doi:10.1016/s0040-6090(98)00848-7

Cited by 28 publications

(21 citation statements)

References 30 publications

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“…This is a non-destructive technique, as long as the photon flow is sufficiently low. It is very important to control this effect when measuring Raman spectra of amorphous thin films, especially highly hydrogenated ones, as some published Raman plasma-produced a-C:H are in fact spectra of annealed film upon the application of the Raman laser (Lamberton et al 1998). …”

Section: Raman Spectroscopymentioning

confidence: 99%

Ultraviolet photoproduction of ISM dust

Dartois¹,

Muñoz²,

Deboffle³

et al. 2005

A&A

130

140

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Abstract. The production of a hydrogenated amorphous carbon polymer (a-C:H) via the photolysis of a series of organic molecule precursors at low temperature is described. Such amorphous material is synthesised under interstellar conditions (10 K and Lyman-α photons) and represents the best candidate to explain the Diffuse Interstellar Medium absorption observed in our Galaxy and in other galaxies. We perform a series of laboratory analyses (Infrared spectroscopy, µspectroscopy, Raman, Photoluminescence and UV-visible spectroscopy) which allow a full characterisation of such polymers. This allows us to assess the importance of the polymer and possible scenarios for its role in crucial aspects of the lifecycle of dust. Such material has implications for the carbon budget at galactic scales, hydrogen formation, extended red emission, as a PAH precursor, and in explaining the 2175 Å extinction bump.

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Section: Raman Spectroscopymentioning

confidence: 99%

Ultraviolet photoproduction of ISM dust

Dartois¹,

Muñoz²,

Deboffle³

et al. 2005

A&A

130

140

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show abstract

“…Micro Raman spectroscopy was used to obtain information concerning the structure transitions within the irradiated areas [12,13]. Raman spectra were recorded in 1808 -backscatter geometry (on samples oriented perpendicularly to the excitation beam direction (z) with a DILOR XY-triple spectrometer, equipped with a liquid nitrogen cooled CCD-multichannel detector and an adapted Olympus microscope in a confocal mode.…”

Section: Gi-xrd Sem and Raman Characterization; Optical Propertiesmentioning

confidence: 99%

Laser annealing of amorphous carbon films

Cappelli¹,

Scilletta²,

Orlando³

et al. 2009

Applied Surface Science

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“…All these changes can be interpreted from the sp 3 / sp 2 bonding ratio of the sputtered a-C structure. 4,[14][15][16][17][18] The relative sp 3 / sp 2 bonding ratio of sputtered a-C film can also be analyzed from XPS C 1s spectrum. Both the G peak and D peak are incurred by the graphitic vibrations.…”

Section: A Film Properties and Microstructuresmentioning

confidence: 99%

Reactions of ultrathin hard amorphous carbon (a-C) films under microbeam laser processing

Zhang

Gong

et al. 2004

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Kinetics and mechanisms of laser-induced decompositions of hydrogenated amorphous carbon films on magnetic hard disksThe decomposition mechanism of hard a-C films under irradiation using a microbeam laser ͑514.5 nm͒ was studied. The films were magnetron sputtered at different pressures to achieve different degrees of sp 3 / sp 2 bonding ratio. Under laser irradiation, they showed graphitization and decomposition. The graphitization saturated at early exposure of ϳ4 min, while the decomposition progressed exponentially with the exposure time, following a first-order reaction mechanism. The decomposition of a-C films under laser irradiation can be modeled using a two-step process with the establishment of a quasi steady-state intermediate. The relative energy barrier and rate constant for film decomposition were calculated. With increasing sp 3 / sp 2 bonding ratio, the films showed increasing resistance against the irradiation-induced changes. This is shown by the decreasing rate constant and increasing energy barrier during the decomposition.

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Monitoring laser-induced microstructural changes of thin film hydrogenated amorphous carbon (a-C:H) using Raman spectroscopy

Cited by 28 publications

References 30 publications

Ultraviolet photoproduction of ISM dust

Ultraviolet photoproduction of ISM dust

Laser annealing of amorphous carbon films

Reactions of ultrathin hard amorphous carbon (a-C) films under microbeam laser processing

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