Publication
Title
Analytical TEM study of CVD diamond growth on $TiO_{2}$ sol-gel layers
Author
Abstract
 The early growth stages of chemical vapor deposition (CVD) diamond on a solgel TiO2 film with buried ultra dispersed diamond seeds (UDD) have been studied. In order to investigate the diamond growth mechanism and understand the role of the TiO2 layer in the growth process, high resolution transmission electron microscopy (HRTEM), energy-filtered TEM and electron energy loss spectroscopy (EELS) techniques were applied to cross sectional diamond film samples. We find evidence for the formation of TiC crystallites inside the TiO2 layer at different diamond growth stages. However, there is no evidence that diamond nucleation starts from these crystallites. Carbon diffusion into the TiO2 layer and the chemical bonding state of carbon (sp2/sp3) were both extensively investigated. We provide evidence that carbon diffuses through the TiO2 layer and that the diamond seeds partially convert to amorphous carbon during growth. This carbon diffusion and diamond to amorphous carbon conversion make the seed areas below the TiO2 layer grow and bend the TiO2 layer upwards to form the nucleation center of the diamond film. In some of the protuberances a core of diamond seed remains, covered by amorphous carbon. It is however unlikely that the remaining seeds are still active during the growth process.
Language
English
Source (journal)
Diamond and related materials. - Amsterdam
Diamond and related materials. - Amsterdam
Publication
Amsterdam : 2012
ISSN
0925-9635
Volume/pages
23 (2012) , p. 93-99
ISI
000302887600017
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
 Faculty/Department Research group Project info Counting Atoms in Nanomaterials (COUNTATOMS).Quantum effects in clusters and nanowires.DINAMO: Development of diamond intracellular nanoprobes for oncogen transformation dynamicsStudy of mechanisms for diamond nucleation in the presence of a metal based interlayer. Publication type Subject Affiliation Publications with a UAntwerp address