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Titolo:
Investigation of carbon aggregates (onions) formed on copper under the conditions of diamond chemical vapour deposition
Autore:
Le Normand, F; Constant, L; Ehret, G; Romeo, M; Charai, A; Saikaly, W; Speisser, C;
Indirizzi:
GSI, IPCMS, CNRS, Unite Mixte Rech 7504, F-67037 Strasbourg 02, France GSI Strasbourg France 02 Mixte Rech 7504, F-67037 Strasbourg 02, France Fac St Jerome, EDIFIS, CNRS, Unite Mixte Rech 6518, F-13397 Marseille, France Fac St Jerome Marseille France F-13397 h 6518, F-13397 Marseille, France
Titolo Testata:
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS ANDMECHANICAL PROPERTIES
fascicolo: 7, volume: 79, anno: 1999,
pagine: 1739 - 1756
SICI:
1364-2804(199907)79:7<1739:IOCA
Fonte:
ISI
Lingua:
ENG
Soggetto:
GROWTH; NUCLEATION; IRRADIATION; TRANSFORMATION; PRESSURE; GRAPHITE; HYDROGEN; CLUSTERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Le Normand, F GSI, IPCMS, CNRS, Unite Mixte Rech 7504, Batiment 69,23 Rue Loess, F-67037Strasbourg 02, France GSI Batiment 69,23 Rue Loess Strasbourg France 02 2, France
Citazione:
F. Le Normand et al., "Investigation of carbon aggregates (onions) formed on copper under the conditions of diamond chemical vapour deposition", PHIL MAG A, 79(7), 1999, pp. 1739-1756

Abstract

We report further observations of graphitic carbon onions and polyhedra that are formed together with graphitic planes under the conditions of the chemical vapour deposition of diamond as previously described by Constant et al. (1997, Surf: Sci., 387, 28). The occurrence of such carbon onions is quite specific to the copper substrate. They were observed with various pre-treatments of the substrate. It is suggested that both the nucleation and the growth of such carbon onions occur on the copper surface rather than in the gas phase. It is believed that, instead of high-energy electron or ion beams as described elsewhere by Banhart (1997, J. appl. Phys., 81, 3440), the formation of carbon onions is due to the high reactivity of the atomic hydrogen present in the gas phase. These hydrogen radicals induce a curvatureof the graphitic planes by preferential reactivity on the corner and edge sites. A dense phase in the core of few carbon onions was sometimes seen. We then measured an interplanar distance down to 0.24 nm, much lower than the distance between two graphitic sheets (0.34 nm). It is found that this dark phase is enriched with tungsten originating from the heated filaments.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 04:23:21