scholarly journals Near-Edge X-Ray Absorption Fine Structure of Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Films Prepared by Pulsed Laser Deposition

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Shinya Ohmagari ◽  
Tsuyoshi Yoshitake ◽  
Akira Nagano ◽  
Sausan AL-Riyami ◽  
Ryota Ohtani ◽  
...  
Keyword(s):  
Fine Structure ◽  
Substrate Temperature ◽  
Amorphous Carbon ◽  
Pulsed Laser ◽  
X Ray ◽  
Hydrogenated Amorphous Carbon ◽  
Absorption Fine ◽  
Ultrananocrystalline Diamond ◽  
X Ray Absorption ◽  
Hydrogenated Amorphous

The atomic bonding configuration of ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon (a-C:H) films prepared by pulsed laser ablation of graphite in a hydrogen atmosphere was examined by near-edge X-ray absorption fine structure spectroscopy. The measured spectra were decomposed with simple component spectra, and they were analyzed in detail. As compared to the a-C:H films deposited at room substrate-temperature, the UNCD/a-C:H and nonhydrogenated amorphous carbon (a-C) films deposited at a substrate-temperature of exhibited enhanced and peaks. At the elevated substrate-temperature, the and bonds formation is enhanced while the C–H and C–C bonds formation is suppressed. The UNCD/a-C:H film showed a larger C–C peak than the a-C film deposited at the same elevated substrate-temperature in vacuum. We believe that the intense C–C peak is evidently responsible for UNCD crystallites existence in the film.

X-ray Absorption Study of Copper Clusters Embedded into Hydrogenated Amorphous Carbon

1997 ◽  
pp. 191-196
Author(s):  
A. V. Kolobov ◽  
K. Takanaka ◽  
H. Oyanagi ◽  
S. G. Yastrebov ◽  
V. I. Ivanov-Omskii ◽  
...  
Keyword(s):  
Amorphous Carbon ◽  
Absorption Study ◽  
X Ray ◽  
Hydrogenated Amorphous Carbon ◽  
Copper Clusters ◽  
X Ray Absorption ◽  
Hydrogenated Amorphous

Roles of boron in growth of diamond grains in ultrananocrystalline diamond/hydrogenated amorphous carbon composite films prepared by pulsed laser deposition

2012 ◽  
Vol 1395 ◽  
Author(s):  
Shinya Ohmagari ◽  
Yūki Katamune ◽  
Hikaru Ichinose ◽  
Tsuyoshi Yoshitake
Keyword(s):  
Pulsed Laser Deposition ◽  
Amorphous Carbon ◽  
Composite Films ◽  
Pulsed Laser ◽  
Carbon Composite ◽  
Laser Deposition ◽  
Hydrogenated Amorphous Carbon ◽  
Ultrananocrystalline Diamond ◽  
Hydrogenated Amorphous ◽  
Crystalline Growth

ABSTRACTBoron doped ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon composite films prepared by pulsed laser deposition were structurally investigated. With an increase in the boron content, the grain size was increased from 5 to 23 nm accompanying by the lattice constant approaching to that of bulk diamond. The near-edge X-ray absorption fine-structure revealed that boron atoms are preferentially distributed into grain boundaries. On the basis of the results, the roles of the boron atoms in the enhanced crystalline growth are discussed. We consider that the crystalline growth posterior to the nucleation is facilitated by boron atoms existing neighbor to UNCD grains or by boron-containing energetic species in plasma.

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