Influence of Temperature on Nano-Graphene Structuring of PLD Grown Carbon Films - An X-Ray Diffraction Study |
| Journal |
Advances in Science and Technology (Volume 48) |
| Volume |
Diamond and Other New Carbon Materials IV |
| Edited by |
P. VINCENZINI and E. CAPPELLI |
| Pages |
55-60 |
| DOI |
10.4028/www.scientific.net/AST.48.55 |
| Online since |
October, 2006 |
| Authors |
Claudia Scilletta,
Marco Servidori,
L. Barba,
E. Cappelli,
S. Orlando,
P. Ascarelli
|
| Keywords |
Carbon Nanostructures, Graphene Cluster Orientation, Grazing Incidence X-Ray Diffractometry (GI-XRD), Nd:YAG Pulsed Laser Deposition |
| 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: λ=532 nm, hν=2.33 eV, τ=7 ns, ν=10 Hz, φ=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 ˆc 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 ˆc 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. |
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