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Graphene based materials for large-scale production can be obtained starting from graphene oxide (GO) by means of suitable treatments in order to reduce the number of oxygen functional groups. The composition and the structure of GO and reduced GO depend on the synthesis and reduction methodologies. In this work, GO was prepared by a modified Hummers method and reduced by pulsed laser irradiation...
The nonlinear optical properties of linear carbon chains prepared by laser ablation in water were studied by using a nanosecond pulsed excitation. A strong optical limiting response was detected at laser fluences above 0.6J/cm2. The nature of the nonlinear effect was investigated by the Z-scan technique, determining both the nonlinear absorption coefficient β and the refraction one n2. A high second-order...
Linear carbon chains (LCCs) contain sp hybridization either as alternating triple and single bonds (polyynes) or with consecutive double bonds (cumulenes). They are detected here in solution by a combined mass spectrometry (MS) and surface enhanced Raman scattering approach, and new insight into the carbon structures, formed after performing pulsed laser ablation of a polycrystalline graphite rod...
Multi-wall carbon nanotubes (MWCNTs) containing linear C chains have been synthesised by arc discharge in liquid nitrogen. The experimental conditions used allow one to obtain nanotubes with a very thin innermost diameter, as evidenced by the radial breathing mode (RBM) features in the Raman spectra. A correlation between the RBM and the features of the C chains is reported, which gives a direct indication...
Irradiation of carbon based solid targets with energetic particles is usually thought to introduce undesirable phenomena such as disorder or graphitization. In some recent experiments we observed that ion irradiation of simple hydrocarbons in the electronic excitation regime leads to the formation of sp-hybridized carbon nanowires with well definite lengths. This has been discussed in view of possible...
First-order Raman spectra of virgin and ion irradiated highly oriented pyrolytic graphite were performed along the basal and edge planes. Ion irradiation was performed in the low fluence regime ( 10 12 -10 13 ions cm -2 ) using a 400 keV Ar + beam in order to a introduce controlled amount of defects in the structure. Virgin edge Raman spectra reveal...
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