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Papers by Giuseppe Compagnini

Research paper thumbnail of Modification of graphene oxide and graphene oxide–TiO2 solutions by pulsed laser irradiation for dye removal from water

Materials Science in Semiconductor Processing, 2015

Research paper thumbnail of Electronic Properties of Ion Implanted Hydrogenated Amorphous Carbon

Journal of Electron Spectroscopy and Related Phenomena

ABSTRACT

Research paper thumbnail of Si-H bonds produced by ion implantation in silicon and frozen silanes

Astronomy and Astrophysics

In a recent paper present new spectra of embedded protostars which exhibit a broad absorption fea... more In a recent paper present new spectra of embedded protostars which exhibit a broad absorption feature near 4.62 µm (2165 cm −1 ). In the literature this band is referred to as the "X(C≡N)" band. However cannot exclude the possibility of a different identification (such as an Si-H related compound) for which they claim the need of experimental data. To contribute to fulfill this request we present here new laboratory results on: (1) the formation of Si-H bonds induced by implantation of 30 keV H + , H 2 + and CH + ions into silicon and (2) the production of Si-H-containing refractory species by ion irradiation (60 keV Ar ions) of frozen dichlorosilane (SiCl 2 H 2 ). The obtained results and others already available in the literature have been compared with astronomical observations. Even if we are aware that the sample we consider here is far from being complete, we suggest that it is possible to exclude that a refractory species containing Si-H groups can be responsible for the interstellar feature.

Research paper thumbnail of Ablation of noble metals in liquids: a method to obtain nanoparticles in a thin polymeric film

Physical Chemistry Chemical Physics

... Absorption decreases markedly at longer wavelengths and this gives rise to the ruby red colou... more ... Absorption decreases markedly at longer wavelengths and this gives rise to the ruby red colour observed in the transmission of white light by small gold sols and gold-based “ruby” glasses. ... 5, P. Mulvaney, T. Linnert and A. Henglein, J. Phys. ...

Research paper thumbnail of Efficient nanoparticle production using wire ablation

Research paper thumbnail of Self Assembled Dipyrromethane Thin Films: Sers Characterization and Application in Methanol Vapours Recognition Through SPR Technique

Sensors and Microsystems, 2001

ABSTRACT A self-assembled monolayer of meso-(4-methylmercapto)dipyrromethane stopped on the silve... more ABSTRACT A self-assembled monolayer of meso-(4-methylmercapto)dipyrromethane stopped on the silver surface has been prepared, characterized by SERS spectroscopy and tested in recognition of methanol vapours by surface plasmon resonance technique.

Research paper thumbnail of The Effect of Bonding Disorder on the Vibrational Features of Amorphous Carbon Based Binary Alloys

MRS Proceedings, 1997

ABSTRACT

Research paper thumbnail of Optical constants in ion-irradiated graphite

Surface and Coatings Technology, 1994

ABSTRACT

Research paper thumbnail of Raman Spectroscopy for Carbon Based Amorphous Thin Films

MRS Proceedings, 2004

ABSTRACT

Research paper thumbnail of Vibrational Spectroscopy in Ion–Irradiated Carbon–Based Thin Films

Topics in Applied Physics, 2006

Page 1. Vibrational Spectroscopy in Ion-Irradiated Carbon-Based Thin Films Giuseppe Compagnini1, ... more Page 1. Vibrational Spectroscopy in Ion-Irradiated Carbon-Based Thin Films Giuseppe Compagnini1, Orazio Puglisi1, Giuseppe A. Baratta2, and Giovanni Strazzulla2 ... 100, 505–520 (2006) © Springer-Verlag Berlin Heidelberg 2006 Page 2. 506 Giuseppe Compagnini et al. ...

Research paper thumbnail of Optical constants of hydrogenated amorphous carbon in the range 0-100 eV

Physical review. B, Condensed matter, Jan 15, 1994

The dielectric behavior of hydrogenated amorphous carbon samples, prepared by keV-Ar-ion bombardm... more The dielectric behavior of hydrogenated amorphous carbon samples, prepared by keV-Ar-ion bombardment of a polystyrene matrix, in the energy range 0-100 eV has been studied in connection with the change in hydrogen content. The wide-ranging results obtained by means of electron-energy-loss spectroscopy in reflection mode have been successfully compared with the optical constants available in the 1-6 eV range, resulting

Research paper thumbnail of Disorder and absorption edges in ion-irradiated hydrogenated amorphous carbon films

Physical review. B, Condensed matter, Jan 15, 1995

... amorphous carbon films G. Compagnini Istituto IMETEM del Consiglio Nazionale delle Ricerche, ... more ... amorphous carbon films G. Compagnini Istituto IMETEM del Consiglio Nazionale delle Ricerche, Stradale Primosole 50, 95100 Catania, Italy U. Zammit and KN Madhusoodanan Dipartimento di ... 125 41.6 4.OX 104 0.36 0.08 105 59.4 4.2X 104 0.21 7 10 E a-) 0 4-) 0~ 0 c-To iz_ ...

Research paper thumbnail of Thin films of tetragonal zirconia with Bi doping: deposition, characterisation and thermal behaviour

Thin Solid Films, 1999

ABSTRACT

Research paper thumbnail of Vibrational and Photoelectron Investigation of Amorphous Fluorinated Carbon Films

The Journal of Physical Chemistry C, 2007

... CS; Li Bassi, A.; Ravagnan, L.; Siviero, F.; Lenardi, C.; Piseri, P.; Buongiorno, G.; Bottani... more ... CS; Li Bassi, A.; Ravagnan, L.; Siviero, F.; Lenardi, C.; Piseri, P.; Buongiorno, G.; Bottani, CE; Milani, P. Phys. Rev. ... Luisa D'Urso, Giuseppe Grasso, Elena Messina, Corrado Bongiorno, Viviana Scuderi, Silvia Scalese, Orazio Puglisi, Giuseppe Spoto and Giuseppe Compagnini. ...

Research paper thumbnail of Carbon nanowires generated by ion irradiation of hydrocarbon ices

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2014

ABSTRACT In this paper we present the formation of carbon nanowires (polyynes and polycumulenes) ... more ABSTRACT In this paper we present the formation of carbon nanowires (polyynes and polycumulenes) in the solid state by ion irradiation of frozen hydrocarbons (C6H6 and C2H2). Irradiations have been performed using H+ ions in the 100's keV energy regime using fluences up to 5 × 1014 ions/cm2. Beyond the intrinsic significance of these results in the field of material science, this work has been motivated by the fact that ion beam irradiation of hydrocarbon ices is one of the most important process thought to happen in several extraterrestrial environments where many spectroscopic features of polyyne molecules have been identified.

Research paper thumbnail of High-yield production of nanoparticles by using wire ablation

Research paper thumbnail of Correlation between absorption edges and electrical conductivity in ion irradiated hydrogenated amorphous carbons

Research paper thumbnail of OUTSTANDING MEETING PAPERS-Formation, evolution, and degradation of nanostructured covalent thin films deposited by low-energy cluster beam deposition

Research paper thumbnail of Nanocluster di metalli preparati mediante ablazione Laser in liquido

Research paper thumbnail of Dispersion and purification of Mo6S3I6 nanowires in organic solvents

Sedimentation measurements have been performed on dispersions of Mo 6 S 3 I 6 nanowires in a rang... more Sedimentation measurements have been performed on dispersions of Mo 6 S 3 I 6 nanowires in a range of common solvents. By far the best solvents were N , N-dimethylformamide ͑DMF͒ and acetone. Stable dispersions of purified Mo 6 S 3 I 6 nanowires in DMF, with concentrations as high as 0.06 g l −1 , could be produced. Detailed analysis of the sedimentation curves showed that the material consisted of three phases, two insoluble phases and one which could be stably dispersed. We associate the insoluble phases with pseudospherical impurities and insoluble nanowires. The sedimenting nanowires tend to be in the form of large diameter bundles, in contrast to the dispersed phase which consists of nanowires arranged in smaller bundles. The average diameters of the nanowire bundles stably suspended in DMF are 12± 14 nm. The measured sedimentation time constants of the insoluble nanowires agree very well with theory allowing us to calculate the solid-fluid interaction parameter, ␤, to be very close to 10 5 Pa. The material could be purified by controlled sedimentation hence the identification of the various phases was confirmed by x-ray photoelectron spectroscopy and scanning electron microscopy.

Research paper thumbnail of Modification of graphene oxide and graphene oxide–TiO2 solutions by pulsed laser irradiation for dye removal from water

Materials Science in Semiconductor Processing, 2015

Research paper thumbnail of Electronic Properties of Ion Implanted Hydrogenated Amorphous Carbon

Journal of Electron Spectroscopy and Related Phenomena

ABSTRACT

Research paper thumbnail of Si-H bonds produced by ion implantation in silicon and frozen silanes

Astronomy and Astrophysics

In a recent paper present new spectra of embedded protostars which exhibit a broad absorption fea... more In a recent paper present new spectra of embedded protostars which exhibit a broad absorption feature near 4.62 µm (2165 cm −1 ). In the literature this band is referred to as the "X(C≡N)" band. However cannot exclude the possibility of a different identification (such as an Si-H related compound) for which they claim the need of experimental data. To contribute to fulfill this request we present here new laboratory results on: (1) the formation of Si-H bonds induced by implantation of 30 keV H + , H 2 + and CH + ions into silicon and (2) the production of Si-H-containing refractory species by ion irradiation (60 keV Ar ions) of frozen dichlorosilane (SiCl 2 H 2 ). The obtained results and others already available in the literature have been compared with astronomical observations. Even if we are aware that the sample we consider here is far from being complete, we suggest that it is possible to exclude that a refractory species containing Si-H groups can be responsible for the interstellar feature.

Research paper thumbnail of Ablation of noble metals in liquids: a method to obtain nanoparticles in a thin polymeric film

Physical Chemistry Chemical Physics

... Absorption decreases markedly at longer wavelengths and this gives rise to the ruby red colou... more ... Absorption decreases markedly at longer wavelengths and this gives rise to the ruby red colour observed in the transmission of white light by small gold sols and gold-based “ruby” glasses. ... 5, P. Mulvaney, T. Linnert and A. Henglein, J. Phys. ...

Research paper thumbnail of Efficient nanoparticle production using wire ablation

Research paper thumbnail of Self Assembled Dipyrromethane Thin Films: Sers Characterization and Application in Methanol Vapours Recognition Through SPR Technique

Sensors and Microsystems, 2001

ABSTRACT A self-assembled monolayer of meso-(4-methylmercapto)dipyrromethane stopped on the silve... more ABSTRACT A self-assembled monolayer of meso-(4-methylmercapto)dipyrromethane stopped on the silver surface has been prepared, characterized by SERS spectroscopy and tested in recognition of methanol vapours by surface plasmon resonance technique.

Research paper thumbnail of The Effect of Bonding Disorder on the Vibrational Features of Amorphous Carbon Based Binary Alloys

MRS Proceedings, 1997

ABSTRACT

Research paper thumbnail of Optical constants in ion-irradiated graphite

Surface and Coatings Technology, 1994

ABSTRACT

Research paper thumbnail of Raman Spectroscopy for Carbon Based Amorphous Thin Films

MRS Proceedings, 2004

ABSTRACT

Research paper thumbnail of Vibrational Spectroscopy in Ion–Irradiated Carbon–Based Thin Films

Topics in Applied Physics, 2006

Page 1. Vibrational Spectroscopy in Ion-Irradiated Carbon-Based Thin Films Giuseppe Compagnini1, ... more Page 1. Vibrational Spectroscopy in Ion-Irradiated Carbon-Based Thin Films Giuseppe Compagnini1, Orazio Puglisi1, Giuseppe A. Baratta2, and Giovanni Strazzulla2 ... 100, 505–520 (2006) © Springer-Verlag Berlin Heidelberg 2006 Page 2. 506 Giuseppe Compagnini et al. ...

Research paper thumbnail of Optical constants of hydrogenated amorphous carbon in the range 0-100 eV

Physical review. B, Condensed matter, Jan 15, 1994

The dielectric behavior of hydrogenated amorphous carbon samples, prepared by keV-Ar-ion bombardm... more The dielectric behavior of hydrogenated amorphous carbon samples, prepared by keV-Ar-ion bombardment of a polystyrene matrix, in the energy range 0-100 eV has been studied in connection with the change in hydrogen content. The wide-ranging results obtained by means of electron-energy-loss spectroscopy in reflection mode have been successfully compared with the optical constants available in the 1-6 eV range, resulting

Research paper thumbnail of Disorder and absorption edges in ion-irradiated hydrogenated amorphous carbon films

Physical review. B, Condensed matter, Jan 15, 1995

... amorphous carbon films G. Compagnini Istituto IMETEM del Consiglio Nazionale delle Ricerche, ... more ... amorphous carbon films G. Compagnini Istituto IMETEM del Consiglio Nazionale delle Ricerche, Stradale Primosole 50, 95100 Catania, Italy U. Zammit and KN Madhusoodanan Dipartimento di ... 125 41.6 4.OX 104 0.36 0.08 105 59.4 4.2X 104 0.21 7 10 E a-) 0 4-) 0~ 0 c-To iz_ ...

Research paper thumbnail of Thin films of tetragonal zirconia with Bi doping: deposition, characterisation and thermal behaviour

Thin Solid Films, 1999

ABSTRACT

Research paper thumbnail of Vibrational and Photoelectron Investigation of Amorphous Fluorinated Carbon Films

The Journal of Physical Chemistry C, 2007

... CS; Li Bassi, A.; Ravagnan, L.; Siviero, F.; Lenardi, C.; Piseri, P.; Buongiorno, G.; Bottani... more ... CS; Li Bassi, A.; Ravagnan, L.; Siviero, F.; Lenardi, C.; Piseri, P.; Buongiorno, G.; Bottani, CE; Milani, P. Phys. Rev. ... Luisa D'Urso, Giuseppe Grasso, Elena Messina, Corrado Bongiorno, Viviana Scuderi, Silvia Scalese, Orazio Puglisi, Giuseppe Spoto and Giuseppe Compagnini. ...

Research paper thumbnail of Carbon nanowires generated by ion irradiation of hydrocarbon ices

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2014

ABSTRACT In this paper we present the formation of carbon nanowires (polyynes and polycumulenes) ... more ABSTRACT In this paper we present the formation of carbon nanowires (polyynes and polycumulenes) in the solid state by ion irradiation of frozen hydrocarbons (C6H6 and C2H2). Irradiations have been performed using H+ ions in the 100's keV energy regime using fluences up to 5 × 1014 ions/cm2. Beyond the intrinsic significance of these results in the field of material science, this work has been motivated by the fact that ion beam irradiation of hydrocarbon ices is one of the most important process thought to happen in several extraterrestrial environments where many spectroscopic features of polyyne molecules have been identified.

Research paper thumbnail of High-yield production of nanoparticles by using wire ablation

Research paper thumbnail of Correlation between absorption edges and electrical conductivity in ion irradiated hydrogenated amorphous carbons

Research paper thumbnail of OUTSTANDING MEETING PAPERS-Formation, evolution, and degradation of nanostructured covalent thin films deposited by low-energy cluster beam deposition

Research paper thumbnail of Nanocluster di metalli preparati mediante ablazione Laser in liquido

Research paper thumbnail of Dispersion and purification of Mo6S3I6 nanowires in organic solvents

Sedimentation measurements have been performed on dispersions of Mo 6 S 3 I 6 nanowires in a rang... more Sedimentation measurements have been performed on dispersions of Mo 6 S 3 I 6 nanowires in a range of common solvents. By far the best solvents were N , N-dimethylformamide ͑DMF͒ and acetone. Stable dispersions of purified Mo 6 S 3 I 6 nanowires in DMF, with concentrations as high as 0.06 g l −1 , could be produced. Detailed analysis of the sedimentation curves showed that the material consisted of three phases, two insoluble phases and one which could be stably dispersed. We associate the insoluble phases with pseudospherical impurities and insoluble nanowires. The sedimenting nanowires tend to be in the form of large diameter bundles, in contrast to the dispersed phase which consists of nanowires arranged in smaller bundles. The average diameters of the nanowire bundles stably suspended in DMF are 12± 14 nm. The measured sedimentation time constants of the insoluble nanowires agree very well with theory allowing us to calculate the solid-fluid interaction parameter, ␤, to be very close to 10 5 Pa. The material could be purified by controlled sedimentation hence the identification of the various phases was confirmed by x-ray photoelectron spectroscopy and scanning electron microscopy.