Surface and structural studies of fullerene C₇₀under ion irradiation

Abstract

Thin films of C 70 were grown on double side polished silicon substrate by resistive heating of C 70 powder. These films were irradiated with 90 MeV Si 7+ ions at different fluences in the range from 1 × 10 12 to 6 × 10 13 ions cm −2 . The investigations on structural and surface modifications were made (after irradiation) by Raman spectroscopy and atomic force microscopy (AFM), respectively. Raman spectroscopic studies reveal that C 70 is not completely transformed into amorphous carbon at a fluence of 6 × 10 13 ions cm −2 . Swift heavy ion irradiation generates nanometre size conducting tracks in fullerenes. For 90 MeV Si ions irradiated C 70 fullerene, the damage crosssection (σ) and radius of damaged cylindrical zone were estimated from Raman spectra, to be ∼0.32 × 10 −13 cm 2 and ∼1.01 nm, respectively, using vibrational modes of C 70 . From AFM study it is clear that the film irradiated at a fluence of 3 × 10 12 ions cm −2 shows maximum roughness. Contact angle measurements have been performed to know about hydrophilic or hydrophobic nature of fullerene C 70 thin films.

Effect of Ag Ion Implantation on SPR of Cu-C60 Nanocomposite Thin Film

“…From the Raman spectroscopy study, it is observed that as the fluence increasing the intensity of the modes is diminishing, then they can no more be resolved. From this, it has been confirmed that the fullerene C 60 in Cu-C 60 nanocomposite thin film is converted into amorphous [38][39][40][41]. Hence, refractive index of the film has also been changed as amorphous carbon (∼1.6) has lower refractive index as compared to pure fullerene C 60 (∼2.1) [17].…”

Surface modification of ES fibres: the controllability of fold structure and its effect on hydrophilicity

“… The fibre interface and spin fibres with specially shaped sections including leaf shape, triangle shape, U-shape, and diamond shape are changed by changing the shape of spinneret holes [7-9]. When the surface is irradiated and the energy of high-energy rays or particles is greater than the binding energy of polymers, the large molecules on the surface of irradiated materials break and form new bonds, and the fibre surface becomes uneven [10,11]. The surface is treated with chemical reagents to decompose some groups of macromolecules [12-14].…”

“…When the surface is irradiated and the energy of high-energy rays or particles is greater than the binding energy of polymers, the large molecules on the surface of irradiated materials break and form new bonds, and the fibre surface becomes uneven [10,11].…”

Hydrophilic modifications of PVDF membranes via swift heavy ion irradiations

“…Swift heavy ion (SHI) irradiation of polymer is a well-established technique to modify the properties of polymers in controlled fashion by chain scission, crosslinking or grafting [20][21][22]. SHI irradiation is a tool which can be used for the tuning of surface properties of the polymeric material [23]. It has been recognised that the surface properties of polymer influences its many other properties, such as adhesion, friction, biocompability, crystallinity and wettability [24,25].…”