A5070400548- Carbon Nanotubes in Composites
- Graphene research and applications
- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Semiconductor materials and interfaces
- Semiconductor materials and devices
- Surface and Thin Film Phenomena
- Topological Materials and Phenomena
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Diamond and Carbon-based Materials Research
- Physics of Superconductivity and Magnetism
- Electron and X-Ray Spectroscopy Techniques
- Molecular Junctions and Nanostructures
- Silicon and Solar Cell Technologies
- Silicon Carbide Semiconductor Technologies
- Advanced Chemical Physics Studies
- Magnetic properties of thin films
- 2D Materials and Applications
- Semiconductor Quantum Structures and Devices
- Thin-Film Transistor Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Surface Chemistry and Catalysis
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
University of Rome Tor Vergata
2015-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2009-2022
Istituto Nazionale di Fisica Nucleare
2014-2021
KU Leuven
2021
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2012-2015
National Interuniversity Consortium for the Physical Sciences of Matter
2006-2013
Istituto Superiore di Sanità
2009
Institute for Complex Systems
2009
Università di Camerino
1994-2004
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
1991-2003
The bulk synthesis of freestanding carbon nanotube (CNT) frameworks is developed through a sulfur-addition strategy during an ambient-pressure chemical vapour deposition process, with ferrocene used as the catalyst precursor. This approach enhances CNTs' length and contorted morphology, which are key features leading to formation synthesized porous networks. We demonstrate that such three-dimensional structure selectively uptakes from water mass toxic organic solvent (i.e. o-dichlorobenzene)...
The extraordinary properties of graphene have spurred huge interest in the experimental realization a two-dimensional honeycomb lattice silicon, namely, silicene. However, its synthesis on supporting substrates remains challenging issue. Recently, strong doubts against possibility synthesizing silicene metallic been brought forward because non-negligible interaction between silicon and metal atoms. To solve growth problems, we directly deposited chemically inert graphite substrate at room...
Transmission electron microscopy (TEM), energy loss near edge structures (EELNES) and scanning tunneling (STM) were used to distinguish silicon nanotubes (SiNT) among the reaction products of a gas phase condensation synthesis. TEM images exhibit tubular nature with well-defined wall. The EELNES spectra performed on each single nanotube show that they are constituted by nonoxidized atoms. STM have diameter ranging from 2 35 nm, an atomic arrangement compatible puckered structure different...
We present experimental evidence for the indirect nature of \ensuremath{\beta}-${\mathrm{FeSi}}_{2}$ gap. furthermore show, by analyzing temperature dependence direct gap means a thermodynamic empirical model, that exhibits an unusually strong electron-phonon interaction. finally deduce electron-hole mobility from our measurements.
We have taken advantage of the native surface roughness and iron content AISI 316 stainless steel to direct grow multi-walled carbon nanotube (MWCNT) random networks by chemical vapor deposition (CVD) at low-temperature ($< 1000^{\circ}$C), without addition any external catalysts or time-consuming pre-treatments. In this way, super-hydrophobic MWCNT films on sheets were obtained, exhibiting high contact angle values ($154^{\circ}$) adhesion force (high hysteresis). Furthermore, investigation...
Abstract A hierarchical structure is an assembly with a multi-scale morphology and large accessible surface area. Recent advances in nanomaterial science have made increasingly possible the design of surfaces specific tunable properties. Here, we report fractal analysis single-walled carbon nanotube (SWCNT) films realized by simple, rapid, reproducible inexpensive filtration process from aqueous dispersion, then deposited drytransfer printing method on several substrates, at room...
We report on a significant photocurrent generation from planar device obtained by coating bare n doped silicon substrate with random network of multiwall carbon nanotubes (MWCNTs). This MWCNT/n-Si hybrid exhibits an incident photon to current efficiency reaching up 34% at 670 nm. also show that MWCNTs covering quartz still exhibit photocurrent, though well below than the substrate. These results suggest are able generate and plays fundamental role in our device. The former effect is...
Mixtures of regioregular poly(3-hexyl-thiophene) (rrP3HT) and multiwall carbon nanotubes have been investigated by scanning tunneling microscopy in ultrahigh vacuum. Carbon covered rrP3HT imaged analyzed, providing a clear evidence that this polymer self-assembles on the nanotube surface following geometrical constraints adapting its equilibrium chain-to-chain distance. Largely spaced analyzed to investigate role played chirality wrapping, evidencing strong interactions along well defined directions.
Graphene, consisting of an inert, thermally stable material with atomically flat, dangling-bond-free surface, is by essence ideal template layer for van der Waals heteroepitaxy two-dimensional materials such as silicene. However, depending on the synthesis method and growth parameters, graphene (Gr) substrates could exhibit, a single sample, various surface structures, thicknesses, defects, step heights. These structures noticeably affect mode epitaxial layers, e.g., turning layer-by-layer...
The authors demonstrate the ability of multiwall carbon nanotubes to generate photocurrents in near ultraviolet and visible spectral ranges using electrochemical photocurrent measurements. photogenerated current depends on excitation wavelength similar that for single wall nanotubes. Its intensity modulation can be related morphology. maximum photon-to-current conversion efficiency is approximately 7%, about 50 times higher than reported This result particular relevance photovoltaic...
The methods developed at IBM to manage and improve the yield of some its newer FET semiconductor products are described. A number visual inspection electric monitoring techniques have evolved since discrete semiconductors were manufactured. data obtained with these used in self-checking models give relative yields for all components. results applied not only day-to-day control manufacturing lines, but also long-range forecasting planning future integrated circuit products. An example is...
The inclusion of carbon nanotubes in polymer matrix has been proposed to enhance the polymer’s physical and electrical properties. In this study, microscopic spectroscopic techniques are used investigate interaction between poly(3-hexylthiophene) (P3HT) reciprocal modification presence P3HT-covered dispersed observed by atomic force microscopy transmission electron microscopy. Then, P3HT optical properties due nanotube evidenced with like absorption Raman spectroscopy. study is completed...
Different amounts of single wall carbon nanotubes (SWCNTs) have been sprayed on amorphous silicon substrates to form Schottky barrier solar cells. The measured external quantum efficiency showed a spectral behavior depending the SWCNT network optical transparency, presenting maximum up 35% at wavelength about 460 nm. Ultrathin SWCNTs acts as semitransparent electrode and forms with silicon, enabling new generation low cost based Numerical simulations show poor contacts in collecting holes...
An angle resolved X-ray photoemission study of carbon nanotube/silicon hybrid photovoltaic (PV) cells is reported, providing a direct probe chemically inhomogeneous, Si–O buried interface between the nanotube (CNT) networked layer and n-type Si substrate. By changing photoelectron takeoff analyzer, nondestructive in-depth profiling CNT/SiOx/SiO2/Si complex achieved. Data are interpreted on basis an extensive modeling process from layered structures, which fully accounts for depth...
Photocurrent generation measured with an electrochemical cell on carbon nanotubes has been obtained mainly from single-walled nanostructures. In fact, multiwall (MWCNTs) were not expected to show analogous low-dimensional effects, due their close similarity metallic graphite. Recently we reported the ability of MWCNTs generate photocurrent in visible and ultraviolet spectral range. this paper a significant enhancement when walls decorated dispersed Cu nanoparticles. This result is particular...