A5053137165- Graphene research and applications
- Synthesis and Properties of Aromatic Compounds
- Fullerene Chemistry and Applications
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Molecular Junctions and Nanostructures
- Carbon Nanotubes in Composites
- Gold and Silver Nanoparticles Synthesis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Molecular spectroscopy and chirality
- Photoreceptor and optogenetics research
- Diamond and Carbon-based Materials Research
- Boron and Carbon Nanomaterials Research
- Laser-Ablation Synthesis of Nanoparticles
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photochemistry and Electron Transfer Studies
- Surface Chemistry and Catalysis
- Catalytic Processes in Materials Science
- Nonlinear Optical Materials Research
- Photochromic and Fluorescence Chemistry
- Organic Electronics and Photovoltaics
- Advancements in Battery Materials
Politecnico di Milano
2016-2025
Robert Bosch (Germany)
2023
Mylan (South Africa)
2016-2021
Tecnologia Energia Ambiente Materiali (Italy)
2016-2021
Milano University Press
2017-2020
Mylan (Switzerland)
2017-2020
University of Nevada, Reno
2020
University of Brescia
2020
National Interuniversity Consortium of Materials Science and Technology
2004-2016
Istituto Nazionale di Documentazione Innovazione e Ricerca Educativa
2015-2016
Since the discovery of graphene, there is an increasing amount research devoted to graphene materials, namely, nanoribbons (GNRs). The "top-down" production narrow (<10 nm wide), unoxidized, and easily processable GNRs with atomically precise edges challenging, therefore, new methods need be developed. We have designed a "bottom-up" approach for synthesis very (ca. 0.5 nm) soluble using nonoxidative alkyne benzannulation strategy promoted by Brønsted acid. Suzuki polymerization was used...
The effect of the confinement pi electrons in one- and two-dimensional domains is illustrated with several examples ranging from linear polyene chains to planar molecules honeycomb structure. Theoretical computations specific Raman experiments on molecular materials demonstrate that a approach provides unified key interpretation response both polyconjugated polymers (polyacetylene) nanostructured graphitic materials.
The engineering of acetylenic carbon-rich nanostructures has great potential in many applications, such as nanoelectronics, chemical sensors, energy storage, and conversion, etc. Here we show the synthesis nanofibers via copper-surface-mediated Glaser polycondensation 1,3,5-triethynylbenzene on a variety conducting (e.g., copper, graphite, fluorine-doped tin oxide, titanium) non-conducting Kapton, glass, silicon dioxide) substrates. obtained (with optical bandgap 2.51 eV) exhibit...
Four different hexahelicenes, 5-aza-hexahelicene (1), hexahelicene (2), 2-methyl-hexahelicene (3), and 2-bromo-hexahelicene (4), were prepared their enantiomers, which are stable at r.t., separated. Vibrational circular dichroism (VCD) spectra measured for compound 1; all the compounds, electronic (ECD) circularly polarized luminescence (CPL) recorded. Each type of experimental spectrum was compared with corresponding theoretical spectrum, determined via Density Functional Theory (DFT)....
Bottom-up synthesis of graphene nanoribbons (GNRs) has significantly advanced during the past decade, providing various GNR structures with tunable properties. The chiral GNRs, however, been underexplored and only limited to (3,1)-GNRs. We report herein surface-assisted first heteroatom-doped (4,1)-GNRs from rationally designed precursor 6,16-dibromo-9,10,19,20-tetraoxa-9a,19a-diboratetrabenzo[a,f,j,o]perylene. structure GNRs verified by scanning tunneling microscopy, noncontact atomic force...
Herein we describe the synthesis, structure, and properties of chiral peropyrenes. Using p-terphenyl-2,2″,6,6″-tetrayne derivatives as precursors, peropyrenes were formed after a 4-fold alkyne cyclization reaction promoted by triflic acid. Due to repulsion two aryl substituents within same bay region, peropyrene adopts twisted backbone with an end-to-end twist angle 28° that was unambiguously confirmed X-ray crystallographic analysis. The products absorb emit in green region UV-visible...
Abstract Graphene is a zero‐gap, semiconducting 2D material that exhibits outstanding charge‐transport properties. One way to open band gap and make graphene useful as confine the electron delocalization in one dimension through preparation of nanoribbons (GNR). Although several methods have been reported so far, solution‐phase, bottom‐up synthesis most promising terms structural precision large‐scale production. Herein, we report well‐defined, helically coiled GNR from polychlorinated poly(...
We describe the first coronoid nanographene C216-molecule. As an extended polycyclic aromatic hydrocarbon containing a defined cavity, our molecule can be seen as model system to study influence of holes on physical and chemical properties graphene. Along pathway eight-step synthesis including Yamamoto-type cyclization followed by 6-fold Diels–Alder cycloaddition, C216 was obtained oxidative cyclodehydrogenation in final step. The molecular structure with cavity unambiguously validated...
sp-Hybridized carbon atomic wires are appealing systems with large property tunability. In particular, their electronic properties intimately related to length, structure, and type of functional end-groups as well other effects such the intermolecular charge transfer metal nanoparticles. Here, by a combined Raman, Surface Enhanced Raman Scattering (SERS) investigation first principles calculations different N,N-dimethylanilino-terminated polyynes, we suggest that, upon interaction silver...
This study elucidates the complex morphology and related spectroscopic response of poly(vinylidene fluoride- co -trifluoroethylene) copolymer, with 80% molar VDF content, namely P(VDF-TrFE) (80/20).
We report the first synthesis of a persulfurated polycyclic aromatic hydrocarbon (PAH) as next-generation “sulflower.” In this novel PAH, disulfide units establish an all-sulfur periphery around coronene core. The structure, electronic properties, and redox behavior were investigated by microscopic, spectroscopic electrochemical methods supported density functional theory. sulfur-rich character renders it promising cathode material for lithium–sulfur batteries, displaying high capacity 520...
LaFeO3/TiO2 composites were prepared in the range 0–12.2 wt% of LaFeO3, characterized, and tested for both benzoic acid (BA) 4-methoxycinnamic (MCA) degradation aqueous solution, hydrogen evolution. The preparation method was via ball-milling without thermal treatment. composite materials presented agglomerates LaFeO3 with an average size from 1 to 5 μm, TiO2 powder well dispersed onto surface each sample. They showed varying activities BA depending on composition light wavelength. 6.2 12.2...
We present a quantum chemical investigation of the vibrational frequencies and Raman intensities large polycyclic aromatic hydrocarbons (PAHs) as models for nanosized graphitic domains in carbon materials. The gradient corrected BLYP functional, framework density functional theory, was employed to compute equilibrium structures, force fields, intensities. Molecules different size (from 24 138 atoms) symmetry (D6h, D3h, D2h) were investigated. It is shown that simulated spectra compare well...
Adamantyl-end-capped polyynes with chains of 4, 6, 8, 10, 12, 16, and 20 sp-hybridized carbons (C4−C20) have been synthesized their IR Raman spectra obtained. On the basis violations mutual-exclusion principle between spectroscopy, spectral evidence demonstrates that these molecules possess a noncentrosymmetric molecular structure in both solid solution states. This premise is supported by X-ray crystallographic analysis C12, which shows bent, state. Density functional theory (DFT)...
We report on the surface-assisted synthesis and spectroscopic characterization of hitherto longest periacene analogue with oxygen–boron–oxygen (OBO) segments along zigzag edges, that is, a heteroatom-doped perihexacene 1. Surface-catalyzed cyclodehydrogenation successfully transformed double helicene precursor 2, i.e., 12a,26a-dibora-12,13,26,27-tetraoxa-benzo[1,2,3-hi:4,5,6-h′i′]dihexacene, into planar 1, which was visualized by scanning tunneling microscopy noncontact atomic force...
Two unprecedented porphyrin fused nanographene molecules, 1 and 2, have been synthesized by the Scholl reaction from tailor-made precursors based on benzo[m]tetraphene-substituted porphyrins. The chemical structures were validated a combination of high-resolution matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (HR MALDI-TOF MS), IR Raman spectroscopy, scanning tunnelling microscopy (STM). UV-vis-near infrared absorption spectroscopy 2 demonstrated broad largely...
Structurally precision graphene nanoribbons (GNRs) are promising candidates for next-generation nanoelectronics due to their intriguing and tunable electronic structures. GNRs with hybrid edge structures often confer them unique geometries associated exotic physicochemical properties. Herein, a novel type of cove-edged periodic short zigzag-edge segments is demonstrated. The bandgap this GNR family can be tuned using an interplay between the length zigzag distance two adjacent cove units...
Surface plasmon resonance peak probed by operando UV-vis diffuse reflectance spectroscopy allows for the monitoring of metal nanoparticles formation on an Au/α-Al 2 O 3 catalyst and evaluation their size stability in reaction conditions.
Polycyclic aromatic hydrocarbons (PAHs) are employed to model the Raman features that generally associated with sp(2) nanostructures in carbon materials or disorder and defects graphitic materials. To this end molecular parameters (geometry changes upon electronic excitation, vibrational normal modes, displacement parameters) computed semiempirical quantum-chemical methods for a series of PAHs ranging from 6 384 atoms, intensities evaluated according Albrecht's formalism restricted A term....
Amorphous carbon films with $sp\text{\ensuremath{-}}s{p}^{2}$ hybridization, produced by supersonic cluster beam deposition, shows the presence of both polyynic and cumulenic species [L. Ravagnan et al., Phys. Rev. Lett. 98, 216103 (2007)]. Here, we present an in situ Raman characterization low-frequency vibrational region $(400--800\text{ }{\text{cm}}^{\ensuremath{-}1})$ at different temperatures. We report two peaks 450 $720\text{ }{\text{cm}}^{\ensuremath{-}1}$. The lower frequency peak...