Time-Resolved Observation of Deposition Process of Ultrananocrystalline Diamond/Hydrogenated Amorphous Carbon Composite Films in Pulsed Laser Deposition. (4th January 2009)

• Record Type: Journal Article
• Authors: Hanada, Kenji; Nishiyama, Takashi; Yoshitake, Tsuyoshi; Nagayama, Kunihito
• Other Names: Joshi Rakesh Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2009(2009)
• Publication Date: 2009-01-04
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2009/901241
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : Optical emission spectroscopy was used to study pulsed laser ablation of graphite in a hydrogen atmosphere wherein ultrananocrystalline diamond (UNCD)/hydrogenated amorphous carbon (a-C:H) composite films were grown on heated substrates. Time-resolved photographs of a plume that expanded from a laser-irradiation spot toward a substrate were taken using a high-speed ICCD camera equipped with narrow-bandpass filters. While the emissions from C atoms and C 2 dimers lasted above the laser-irradiation spot on the target, the emission from C + ions lasted above the substrate surface for approximately 7 microseconds, although the emission lifetime of species is generally approximately 10 nanoseconds. This implies that C + ions actively collided with each other above the substrate surface for such a long time. We believe that the keys to UNCD growth in PLD are the supply of highly energetic carbon species at a high density to the substrate and existence of atomic hydrogen during the growth.