Photoluminescence of Amorphous Hydrogenated Carbon Films, a-C:H

1989 ◽  
Vol 149 ◽  
Author(s):  
V. A. Vassilyev ◽  
A. S. Volkov ◽  
E. Musabekov ◽  
E. I. Terukov ◽  
V. E. Chelnokov ◽  
...  
Keyword(s):  
Disordered Systems ◽  
Radiative Recombination ◽  
Structural Disorder ◽  
Carbon Films ◽  
Localized States ◽  
Electron Hole ◽  
High Degree ◽  
Anti Stokes ◽  
Amorphous Hydrogenated Carbon ◽  
Kinetics Of

ABSTRACTResults are presented on the photoluminescence of plasma deposited amorphous carbon (a-C:H) films. Emission and exci tation spectra anti-Stokes emission, PL decay and fatigue, T-dependence of PL and photobleaching were mesuared. The data are discussed in terms of radiative recombination of the strongly localized electron-hole pairs.As recently shown, in amorphous hydrogenated carbon films (a-C:H) powerful talls of localized states occur in the mobility gap that are due to a high degree of structural disorder [1] while a radiative recombination in this material is highly efficient [2, 3]. These properties, in our view, make a-C:H suitable for verification of models of recombination kinetics of photoexcited charge carriers in highly disordered systems with the use of photoluminescence (PL).

Structural Disorder in Hard Amorphous Carbon Films Implanted with Nitrogen Ions

1995 ◽  
Vol 396 ◽  
Author(s):  
F.L. Freire ◽  
D.F. Franceschini ◽  
C.A. Achete ◽  
R.S. Brusa ◽  
G. Mariotto ◽  
...  
Keyword(s):  
Carbon Film ◽  
Positron Annihilation Spectroscopy ◽  
Structural Disorder ◽  
Carbon Films ◽  
Structural Modifications ◽  
Self Bias ◽  
S Parameter ◽  
Nitrogen Ions ◽  
Amorphous Hydrogenated Carbon

AbstractHard amorphous hydrogenated carbon films deposited by self-bias glow discharge were implanted at room temperature with 70 keV-nitrogen ions at fluences between 2.0 and 9.0×1016 N/cm2. The implanted samples were analyzed by Raman spectroscopy, SIMS and positron annihilation spectroscopy (Doppler broadening technique with the determination of the parameter S. For samples implanted with 2.0x1016 N/cm2 the S parameter follows the vacancies depth profile predicted by Monte Carlo simulation. For higher fluences we observed a reduction in the measured value of S. This result is discussed in terms of both hydrogen loss and structural modifications(increase of disorder at local scale and of the number of graphitic domains) induced in the carbon film by ion implantation.

scholarly journals Characterization of amorphous hydrogenated carbon films deposited by MFPUMST at different ratios of mixed gases

2012 ◽  
Vol 35 (7) ◽  
pp. 1087-1091
Author(s):  
HAIYANG DAI ◽  
CHANGYONG ZHAN ◽  
HUI JIANG ◽  
NINGKANG HUANG
Keyword(s):  
Carbon Films ◽  
Mixed Gases ◽  
Amorphous Hydrogenated Carbon

DNA—RNA hybridization

1975 ◽  
Vol 272 (915) ◽  
pp. 147-157 ◽  
Keyword(s):  
Nucleic Acid ◽  
Complex Mixture ◽  
Nucleic Acid Hybridization ◽  
Biological Research ◽  
Specific Sequence ◽  
Different Populations ◽  
Higher Eukaryotes ◽  
High Degree ◽  
Kinetics Of ◽  
Specific Sequences

Interest in nucleic acid hybridization stems mainly from its great power as a tool in biological research. It is used in several quite distinct ways. Because of the high degree of specificity that they show, hybridization techniques can be used to measure the amount of one specific sequence within a very heterogeneous mixture of sequences. Measurements of 1/10 6 -10 7 have been recorded. In extension of this, various properties of a specific sequence can often be studied. Secondly, because the kinetics of nucleic acid hybridization are quite well understood, it can be used to characterize both a pure sequence and a very complex mixture of sequences, like the genome of a vertebrate. Thirdly, again because of its specificity, it can be used to measure homologies between different populations of nucleic acids. Lastly, in conjunction with other techniques, it can be used as a basis for the fractionation of nucleic acid populations and the purification of specific sequences. Specific examples of these applications are given, with special reference to the organization of the genome in higher eukaryotes.

Optical properties of amorphous hydrogenated carbon films: A spectroscopic ellipsometry study

1987 ◽  
Vol 2 (5) ◽  
pp. 645-647 ◽  
Author(s):  
Shuhan Lin ◽  
Shuguang Chen
Keyword(s):  
Optical Properties ◽  
Spectroscopic Ellipsometry ◽  
Carbon Films ◽  
Index Of Refraction ◽  
The Real ◽  
Complex Index ◽  
Tentative Explanation ◽  
Amorphous Hydrogenated Carbon ◽  
Ellipsometry Data ◽  
Complex Index Of Refraction

Optical properties of plasma-deposited amorphous hydrogenated carbon films were studied by spectroscopic ellipsometry. From the ellipsometry data, the real and imaginary parts, n and k, of the complex index of refraction of the film have been deduced for photon energies between 2.0 and 4.0 eV for as-grown as well as for thermally annealed films. Here n and k showed considerable variation with subsequent annealing, even under 400°C. A tentative explanation of the results is proposed.

scholarly journals Reactivity of soft amorphous hydrogenated carbon films in ambient atmosphere

2007 ◽  
Vol 363-365 ◽  
pp. 944-948 ◽  
Author(s):  
E. Salançon ◽  
T. Dürbeck ◽  
T. Schwarz-Selinger ◽  
W. Jacob
Keyword(s):  
Carbon Films ◽  
Ambient Atmosphere ◽  
Amorphous Hydrogenated Carbon
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