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Influence of temperature on nano-graphene structuring of PLD grown carbon films - An X-ray diffraction study (Contributo in atti di convegno)

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Influence of temperature on nano-graphene structuring of PLD grown carbon films - An X-ray diffraction study (Contributo in atti di convegno) (literal)

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C. Scilletta (1); M. Servidori (3); L. Barba (4); E. Cappelli (1); S. Orlando (2); P. Ascarelli (1) (2006)
Influence of temperature on nano-graphene structuring of PLD grown carbon films - An X-ray diffraction study
in Diamond and Other New Carbon Materials IV, Acireale (Catania), Italy, June 4-9,2006
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C. Scilletta (1); M. Servidori (3); L. Barba (4); E. Cappelli (1); S. Orlando (2); P. Ascarelli (1) (literal)

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Diamond and Other New Carbon Materials IV - Proceedings of the 4th International Conference \"Diamond and Other New Carbon Materials\", of the Forum on New Materials, part of CIMTEC 2006 - 11th International Ceramics Congress and 4th Forum on New Materials (literal)

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Advances in Science and Technology, 48, 55-60 (2006). Proceedings of the 4th International Conference Diamond and Other New Carbon Materials, v. 3 of the Forum on New Materials, part of CIMTEC 2006 - 11th International Ceramics Congress and 4th Forum on New Materials, Acireale, Sicily, Italy, June 4-9, 2006. Eds. P. Vincenzini and E. Cappelli. Trans Tech Publications, Switzerland. Online at http://www.scientific.net (literal)

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(1) CNR-ISC sez. Montelibretti, via Salaria Km.29.3, P.O.B.10, 00016 Monterotondo, Rome, Italy (2) CNR-IMIP sez. Potenza, P.O.B.27, 85050,Tito Scalo, Potenza, Italy (3) CNR-IMM sez. Bologna, via P.Gobetti 101, 40129 Bologna, Italy (4) CNR-IC, Monterotondo and ELETTRA Synchrotron, Trieste (literal)

Titolo

Influence of temperature on nano-graphene structuring of PLD grown carbon films - An X-ray diffraction study (literal)

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Abstract

The physical properties of graphene nano-structures are highly anisotropic and generally correlated to the graphene sheet orientation. We investigated the capability to grow nano-graphene structured carbon films and to control their texturing by pulsed laser ablation of a pyrolytic graphite target (Nd:YAG laser, 2nd harmonic: ?=532 nm, h?=2.33 eV, ?=7 ns, ?=10 Hz, ?=7 J/cm2), operating at different temperature conditions. Carbon films were deposited on Si <100> substrates. Detailed characterisation by synchrotron X-ray measurements were performed on samples deposited in vacuum (~10-3 Pa) at high substrate temperatures (>800°C) and at room temperature followed by post-annealing at high temperature (>800°C). The X-ray measurements established the formation of nano-sized graphene structures for both sample sets. In the first set, the nano-particles are correlated among them, their size increases with substrate temperature and a longitudinal growth of parallel graphene layers occurs, with the ^c axis parallel to the substrate. In post annealed sample set, on the contrary, the nano-particles size is smaller and depends weakly on annealing temperature. The graphene ^c axis results to be randomly oriented up to ~850°C. Above this temperature it seems that a transition phase occurs and the c axis results to lie parallel to substrate plane. (literal)

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