http://www.cnr.it/ontology/cnr/individuo/prodotto/ID34217

Morphology, structure and density evolution of carbon nanostructures deposited by N-IR pulsed laser ablation of graphite (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Morphology, structure and density evolution of carbon nanostructures deposited by N-IR pulsed laser ablation of graphite (Articolo in rivista) (literal)

Anno

2008-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1016/j.diamond.2008.03.005 (literal)

Alternative label

E. Cappelli; C. Scilletta; M. Servitori; V. Valentini; S. Orlando (2008)
Morphology, structure and density evolution of carbon nanostructures deposited by N-IR pulsed laser ablation of graphite
in Diamond and related materials; Elsevier Sequoia, Lausanne (Svizzera)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

E. Cappelli; C. Scilletta; M. Servitori; V. Valentini; S. Orlando (literal)

Pagina inizio

1476 (literal)

Pagina fine

1481 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

17 (literal)

Rivista

Diamond and related materials (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

6 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

7-10 (literal)

Note

Scopu (literal)
ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

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

Titolo

Morphology, structure and density evolution of carbon nanostructures deposited by N-IR pulsed laser ablation of graphite (literal)

Abstract

Carbon films were deposited by pulsed laser ablation on Si b100N substrates, heated at temperatures increasing from RT to 800 °C, from a pure graphite target, operating in vacuum (~10-4 Pa). The laser ablation was performed by an Nd:YAG laser, operating in the near IR wavelength (?=1064 nm). Micro-Raman and grazing incidence X-ray diffraction analysis (GI-XRD) established the progressive formation of ordered nano-sized graphitic structures, increasing substrate temperature. The surface morphology is characterised by macroscopic roughness (SEM, AFM) while the low temperature samples are characterised by very smooth surface. The film density, evaluated by X-ray reflectivity measurements, is also affected by the substrate temperature. This structural property modification induces relevant variation on the emission properties of carbon films, as evidenced by Field Emission measurements. The film structure and texturing is also strongly related to laser wavelength: the low energy associated to the IR laser radiation (1.17 eV) causes an early aromatic cluster formation at T=400 °C associated to a sensible increase in the aromatic plane stacking distance (d002~0.39 nm), compared to graphite. These density decrease shows a direct correlation with the electron emission properties. Roughness and presence of voids play a negative role both on the threshold electric field Eth and enhancement factor (?) The density decreasing and graphitic layer widening are notably to be ascribed to the very fast out-of-equilibrium growth and to the presence of large activated carbon species in the \"plume\". (literal)

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