Publication Informations

Title
Ultrafast pulsed laser deposition of carbon nanostructures: Structural and optical characterization
Authors: M. Pervolaraki; Ph. Komninou; J. Kioseoglou; A. Othonos; J. Giapintzakis
Year: 2013
Research Area: Ultrafast Spectroscopy
Type of Publication: Article
Journal Details
Journal: Applied Surface Science
Volume: 278
Pages: 101 - 105
ISSN: 0169-4332
Keywords: Ultrafast pulsed laser deposition
Abstract:
Carbon nanostructured materials were obtained by high-repetition rate pulsed laser ablation of a graphite target using a train of 10-ps duration pulses at 1064 nm in different pressures of high-purity Ar gas. It is demonstrated that their microstructure and optical properties vary as a function of the argon pressure. High-resolution transmission electron microscopy revealed the existence of onion-like carbon nanostructures embedded in a matrix of amorphous carbon nanofoam for samples prepared at 300 Pa. In comparison samples prepared at 30 Pa show evidence of both onion-like and turbostratic carbon coexisting in a matrix of amorphous carbon nanofoam whereas samples prepared in vacuum are continuous films of amorphous carbon. Transient transmission spectroscopy measurements suggested that free carrier absorption is the dominant effect following photo-excitation for probing wavelengths in the range of 550–1000 nm and its magnitude varies among the materials investigated due to their different microstructures.
Note:
Laser materials processing for micro and nano applications, E-MRS 2012 Symposium V
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