Fabio Ronci - Academia.edu (original) (raw)
Papers by Fabio Ronci
Physical Review Letters, 2005
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Applied Surface Science
tThe thermal oxidation of the ˇ-Si3N4(0 0 0 1)-8 × 8 surface has been carried out. The spectrosco... more tThe thermal oxidation of the ˇ-Si3N4(0 0 0 1)-8 × 8 surface has been carried out. The spectroscopic char-acterization has been performed by high resolution core-level and by angle-resolved photoemissionspectroscopy. Our findings demonstrate that the surface shows a low but clear reactivity with oxygen.The known resonance ascribed to the 8 × 8 reconstruction results strongly affected by the oxygen dosing,demonstrating the involvement of the topmost nitride atoms.
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ACS Nano
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Nanotechnology, Jan 19, 2017
We report a study of the interface between antimony and the prototypical topological insulator... more We report a study of the interface between antimony and the prototypical topological insulator Sb/Bi<sub>2</sub>Se<sub>3</sub>. Scanning tunnelling microscopy measurements show the presence of ordered domains displaying a perfect lattice match with bismuth selenide. Density functional theory calculations of the most stable atomic configurations demonstrate that the ordered domains can be attributed to stacks of β-antimonene.
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Chemistry (Weinheim an der Bergstrasse, Germany), Jan 18, 2017
We have investigated the formation and the properties of ultrathin films of ruthenium phthalocyan... more We have investigated the formation and the properties of ultrathin films of ruthenium phthalocyanine (RuPc)₂ vacuum deposited on graphite by scanning tunneling microscopy and synchrotron photoemission spectroscopy measurements assisted by ab initio simulations. Thanks to its unique dimeric structure connected by a direct Ru-Ru bond, (RuPc)₂ can be found in two stable rotameric forms separated by a low-energy barrier. Such isomerism leads to a peculiar organization of the molecules in flat, horizontal layers on the graphite surface, characterized by a chessboard-like alternation of the two rotamers. Moreover, the molecules are vertically connected to form π-stacked columnar pillars of akin rotamers, compatible with the high conductivity measured in (RuPc)₂ powders. Such features yield an unprecedented supramolecular assembly of phthalocyanine films, which could open interesting perspectives toward the realization of new architectures of organic-electronics devices.
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Physical Review Letters, 2009
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Electrochem Solid State Lett, 1999
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Key Engineering Materials, Sep 9, 2001
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Synthetic Metals, Jun 15, 1997
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Japanese Journal of Applied Physics, Mar 30, 2006
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Ionics, 1999
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J Phys Chem B, 2002
ABSTRACT In-situ X-ray diffraction studies have been performed on a Li4/3Ti5/3O4 electrode upon c... more ABSTRACT In-situ X-ray diffraction studies have been performed on a Li4/3Ti5/3O4 electrode upon cycling in a Li cell, by using a very high energy (87.5 keV) synchrotron beam. The real time structural changes of its crystalline lattice were observed over two complete cycles of the cell. The high-resolution measurements allowed us to precisely monitor the extremely small breathing movement of the structure and to plot the curve of the lattice parameter as a function of the lithiation degree. The investigation revealed an unexpected behavior in the structural evolution upon cycling, which was attributed to the reversible passage from a monophasic to a biphasic domain upon insertion. Furthermore, the structural evolution turned out to be slightly different in the first and in the second cycle. This suggests that irreversible rearrangements, like the ones observed for every other insertion compound, occur also in this case, although on an extremely smaller scale.
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J Phys Condens Matter, 2010
After almost three decades since the invention of the scanning tunnelling microscope (STM) its ap... more After almost three decades since the invention of the scanning tunnelling microscope (STM) its application to the study of dynamic processes at surfaces is attracting a great deal of interest due to its unique capacity to observe such processes at the atomic level. The α-phase of group IV adatoms on Ge(111) and Si(111) is the ideal playground for the analysis of critical phenomena and represents a prototype of a two-dimensional electron system exhibiting thermally activated peculiar Sn adatom dynamics. This paper will relate the study of adatom dynamics at the α-Sn/Ge(111) and α-Sn/Si(111) surfaces, discussing in detail the methods we used for such kinds of time-resolved measurements. The microscope tip was used to record the tunnelling current on top of an oscillating Sn adatom, keeping the feedback loop turned off. The dynamics of the adatoms is detected as telegraph noise present in the tunnelling versus time curves. With this method it is possible to increase the acquisition rate to the actual limit of the instrument electronics, excluding piezo movement and feedback circuitry response time. We put emphasis on the statistical data analysis which allows the localization of the sample areas that are involved in dynamical processes.
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Appl Phys Lett, 2001
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Japanese Journal of Applied Physics, Mar 30, 2006
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Phys Rev Lett, 2007
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Physical Review Letters, 2008
Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measur... more Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are presented to assess the nature of the alpha-Sn/Ge(111) surface. Bias-dependent STM and STS measurements have been used to demonstrate that such a surface preserves a metallic 3 x 3 reconstruction at very low temperature. A tip-surface interaction mechanism becomes active below about 20 K at the alpha-Sn/Ge(111) surface, resulting in an apparent unbuckled (sqrt[3] x sqrt[3]) reconstruction when filled states STM images are acquired with tunneling currents higher than 0.2 nA.
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Nano Letters, 2016
The possibility to intercalate noble gas atoms below epitaxial graphene monolayers coupled with t... more The possibility to intercalate noble gas atoms below epitaxial graphene monolayers coupled with the instability at high temperature of graphene on the surface of certain metals has been exploited to produce Ar-filled graphene nanosized blisters evenly distributed on the bare Ni(111) surface. We have followed in real time the self-assembling of the nanoblisters during the thermal annealing of the Gr/Ni(111) interface loaded with Ar and characterized their morphology and structure at the atomic scale. The nanoblisters contain Ar aggregates compressed at high pressure arranged below the graphene monolayer skin that is decoupled from the Ni substrate and sealed only at the periphery through stable C-Ni bonds. Their in-plane truncated triangular shapes are driven by the crystallographic directions of the Ni surface. The nonuniform strain revealed along the blister profile is explained by the inhomogeneous expansion of the flexible graphene lattice that adjusts to envelop the Ar atom stacks.
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Phys Rev Lett, 2008
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Phys Rev Lett, 2008
Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measur... more Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are presented to assess the nature of the alpha-Sn/Ge(111) surface. Bias-dependent STM and STS measurements have been used to demonstrate that such a surface preserves a metallic 3 x 3 reconstruction at very low temperature. A tip-surface interaction mechanism becomes active below about 20 K at the alpha-Sn/Ge(111) surface, resulting in an apparent unbuckled (sqrt[3] x sqrt[3]) reconstruction when filled states STM images are acquired with tunneling currents higher than 0.2 nA.
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Physical Review Letters, 2005
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Applied Surface Science
tThe thermal oxidation of the ˇ-Si3N4(0 0 0 1)-8 × 8 surface has been carried out. The spectrosco... more tThe thermal oxidation of the ˇ-Si3N4(0 0 0 1)-8 × 8 surface has been carried out. The spectroscopic char-acterization has been performed by high resolution core-level and by angle-resolved photoemissionspectroscopy. Our findings demonstrate that the surface shows a low but clear reactivity with oxygen.The known resonance ascribed to the 8 × 8 reconstruction results strongly affected by the oxygen dosing,demonstrating the involvement of the topmost nitride atoms.
Bookmarks Related papers MentionsView impact
ACS Nano
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Nanotechnology, Jan 19, 2017
We report a study of the interface between antimony and the prototypical topological insulator... more We report a study of the interface between antimony and the prototypical topological insulator Sb/Bi<sub>2</sub>Se<sub>3</sub>. Scanning tunnelling microscopy measurements show the presence of ordered domains displaying a perfect lattice match with bismuth selenide. Density functional theory calculations of the most stable atomic configurations demonstrate that the ordered domains can be attributed to stacks of β-antimonene.
Bookmarks Related papers MentionsView impact
Chemistry (Weinheim an der Bergstrasse, Germany), Jan 18, 2017
We have investigated the formation and the properties of ultrathin films of ruthenium phthalocyan... more We have investigated the formation and the properties of ultrathin films of ruthenium phthalocyanine (RuPc)₂ vacuum deposited on graphite by scanning tunneling microscopy and synchrotron photoemission spectroscopy measurements assisted by ab initio simulations. Thanks to its unique dimeric structure connected by a direct Ru-Ru bond, (RuPc)₂ can be found in two stable rotameric forms separated by a low-energy barrier. Such isomerism leads to a peculiar organization of the molecules in flat, horizontal layers on the graphite surface, characterized by a chessboard-like alternation of the two rotamers. Moreover, the molecules are vertically connected to form π-stacked columnar pillars of akin rotamers, compatible with the high conductivity measured in (RuPc)₂ powders. Such features yield an unprecedented supramolecular assembly of phthalocyanine films, which could open interesting perspectives toward the realization of new architectures of organic-electronics devices.
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Physical Review Letters, 2009
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Electrochem Solid State Lett, 1999
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Key Engineering Materials, Sep 9, 2001
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Synthetic Metals, Jun 15, 1997
Bookmarks Related papers MentionsView impact
Japanese Journal of Applied Physics, Mar 30, 2006
Bookmarks Related papers MentionsView impact
Ionics, 1999
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J Phys Chem B, 2002
ABSTRACT In-situ X-ray diffraction studies have been performed on a Li4/3Ti5/3O4 electrode upon c... more ABSTRACT In-situ X-ray diffraction studies have been performed on a Li4/3Ti5/3O4 electrode upon cycling in a Li cell, by using a very high energy (87.5 keV) synchrotron beam. The real time structural changes of its crystalline lattice were observed over two complete cycles of the cell. The high-resolution measurements allowed us to precisely monitor the extremely small breathing movement of the structure and to plot the curve of the lattice parameter as a function of the lithiation degree. The investigation revealed an unexpected behavior in the structural evolution upon cycling, which was attributed to the reversible passage from a monophasic to a biphasic domain upon insertion. Furthermore, the structural evolution turned out to be slightly different in the first and in the second cycle. This suggests that irreversible rearrangements, like the ones observed for every other insertion compound, occur also in this case, although on an extremely smaller scale.
Bookmarks Related papers MentionsView impact
J Phys Condens Matter, 2010
After almost three decades since the invention of the scanning tunnelling microscope (STM) its ap... more After almost three decades since the invention of the scanning tunnelling microscope (STM) its application to the study of dynamic processes at surfaces is attracting a great deal of interest due to its unique capacity to observe such processes at the atomic level. The α-phase of group IV adatoms on Ge(111) and Si(111) is the ideal playground for the analysis of critical phenomena and represents a prototype of a two-dimensional electron system exhibiting thermally activated peculiar Sn adatom dynamics. This paper will relate the study of adatom dynamics at the α-Sn/Ge(111) and α-Sn/Si(111) surfaces, discussing in detail the methods we used for such kinds of time-resolved measurements. The microscope tip was used to record the tunnelling current on top of an oscillating Sn adatom, keeping the feedback loop turned off. The dynamics of the adatoms is detected as telegraph noise present in the tunnelling versus time curves. With this method it is possible to increase the acquisition rate to the actual limit of the instrument electronics, excluding piezo movement and feedback circuitry response time. We put emphasis on the statistical data analysis which allows the localization of the sample areas that are involved in dynamical processes.
Bookmarks Related papers MentionsView impact
Appl Phys Lett, 2001
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Japanese Journal of Applied Physics, Mar 30, 2006
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Phys Rev Lett, 2007
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Physical Review Letters, 2008
Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measur... more Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are presented to assess the nature of the alpha-Sn/Ge(111) surface. Bias-dependent STM and STS measurements have been used to demonstrate that such a surface preserves a metallic 3 x 3 reconstruction at very low temperature. A tip-surface interaction mechanism becomes active below about 20 K at the alpha-Sn/Ge(111) surface, resulting in an apparent unbuckled (sqrt[3] x sqrt[3]) reconstruction when filled states STM images are acquired with tunneling currents higher than 0.2 nA.
Bookmarks Related papers MentionsView impact
Nano Letters, 2016
The possibility to intercalate noble gas atoms below epitaxial graphene monolayers coupled with t... more The possibility to intercalate noble gas atoms below epitaxial graphene monolayers coupled with the instability at high temperature of graphene on the surface of certain metals has been exploited to produce Ar-filled graphene nanosized blisters evenly distributed on the bare Ni(111) surface. We have followed in real time the self-assembling of the nanoblisters during the thermal annealing of the Gr/Ni(111) interface loaded with Ar and characterized their morphology and structure at the atomic scale. The nanoblisters contain Ar aggregates compressed at high pressure arranged below the graphene monolayer skin that is decoupled from the Ni substrate and sealed only at the periphery through stable C-Ni bonds. Their in-plane truncated triangular shapes are driven by the crystallographic directions of the Ni surface. The nonuniform strain revealed along the blister profile is explained by the inhomogeneous expansion of the flexible graphene lattice that adjusts to envelop the Ar atom stacks.
Bookmarks Related papers MentionsView impact
Phys Rev Lett, 2008
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Phys Rev Lett, 2008
Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measur... more Low temperature (down to 2.5 K) scanning tunneling microscopy (STM) and spectroscopy (STS) measurements are presented to assess the nature of the alpha-Sn/Ge(111) surface. Bias-dependent STM and STS measurements have been used to demonstrate that such a surface preserves a metallic 3 x 3 reconstruction at very low temperature. A tip-surface interaction mechanism becomes active below about 20 K at the alpha-Sn/Ge(111) surface, resulting in an apparent unbuckled (sqrt[3] x sqrt[3]) reconstruction when filled states STM images are acquired with tunneling currents higher than 0.2 nA.
Bookmarks Related papers MentionsView impact