A5018343606- Graphene research and applications
- Synthesis and Properties of Aromatic Compounds
- Gold and Silver Nanoparticles Synthesis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Fullerene Chemistry and Applications
- Molecular Junctions and Nanostructures
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Chemical Physics Studies
- Catalytic Processes in Materials Science
- Advanced Photocatalysis Techniques
- Graphene and Nanomaterials Applications
- Laser-induced spectroscopy and plasma
- Spectroscopy Techniques in Biomedical and Chemical Research
- TiO2 Photocatalysis and Solar Cells
- Luminescence and Fluorescent Materials
- Diamond and Carbon-based Materials Research
- Carbon Nanotubes in Composites
- Photochromic and Fluorescence Chemistry
- Electrochemical Analysis and Applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Nonlinear Optical Materials Research
- Copper-based nanomaterials and applications
- Supercapacitor Materials and Fabrication
Politecnico di Milano
2016-2025
Robert Bosch (Germany)
2023
University of Nevada, Reno
2020
University of Brescia
2020
Mylan (Switzerland)
2017-2018
Milano University Press
2017-2018
Tecnologia Energia Ambiente Materiali (Italy)
2017
Material (Belgium)
2017
Instituto Politécnico Nacional
2014
Friedrich-Alexander-Universität Erlangen-Nürnberg
2010
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...
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)....
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(...
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...
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...
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)...
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.
One-dimensional carbon atomic wires displaying sp hybridization have an appealing electronic and vibrational structure which profoundly affects their optical transport properties. Here we investigated charge transfer in alternating triple–single bond (polyynes) terminated by phenyl rings its effects on the of system. The occurrence a between metal nanoparticles (both liquids supported surfaces) is evidenced Raman surface enhanced scattering (SERS) as softening stretching modes. This...
Symmetrically and unsymmetrically endcapped polyynes (triisopropylsilyl – TIPS super trityl endcapping groups) have been studied with density functional theory calculations Raman infrared spectroscopy. This spectroscopic investigation provides general guidelines for studying the vibrational structural features of sp‐carbon‐based materials, which nowadays are at center growing interest potential applications nanostructured carbon materials in molecular electronics. On basis description CC...
Here we describe a new class of CPL switches based on oxophilic interactions between chiral sulfoxide-containing ortho-phenylene ethynylene (o-OPE) foldamers and cationic metals. These systems represent unique case combining high glum values (up to 0.7 × 10-2) quantum yields in both folded ON unfolded OFF states.
Polymeric dielectrics are employed extensively in the power transmission industry, thanks to their excellent properties; however, under normal operating conditions these materials tend degrade and fail. In this study, samples of low-density polyethylene, polypropylene, polymethyl methacrylate, polytetrafluorethylene were subjected corona discharges nitrogen air atmospheres. The introduced structural modifications over polymer surface. From a chemical perspective, alterations analogous among...
Novel bis(biphenyl)-capped polyynes have been synthesized to investigate the modulation of electronic and optical properties sp-hybridized carbon-atom wires (CAWs) capped with {\pi}-conjugated $sp^{2}$ endgroups. Raman Surface Enhanced spectroscopy (SERS) investigation these systems Density Functional Theory (DFT) calculations reveal structural changes from polyyne-like alternating single-triple bonds towards cumulene-like more equalized as a consequence charge transfer occurring when...
A novel nanohybrid composite of TiO2, SiO2, γ-Fe2O3, and reduced graphene oxide (TiO2@Si:Fe:rGO) is fabricated by the sol–gel method. The properties coated film were examined structural self-cleaning analyses using simulated discoloration/soiling roofing tests. transparent TiO2@Si:Fe:rGO showed excellent photoactivity wettability, behaving well in applications. addition SiO2 improved crystalline structure surface hydroxylation TiO2 nanoparticles. γ-Fe2O3 decreased recombination rate e–/h+...
Linear and helical graphene nanoribbons (L-PyGNR H-PyGNR) bearing electron-rich pyrrole units have been synthesized by using the photochemical cyclodehydrochlorination (CDHC) reaction. The in polymer backbone make with moderate bandgap values relatively high HOMO energy levels. planarization of unit through cyclization yields a value almost 0.5 eV lower than that measured for polypyrrole. Conductivity thin film up to 0.12 S/cm were chemically oxidized L-PyGNR (four-point method). Both GNRs...
Abstract n‐peri‐Acenes (n‐PAs) have gained interest as model systems of zigzag‐edged graphene nanoribbons for potential applications in nanoelectronics and spintronics. However, the synthesis n‐PAs larger than peri‐tetracene remains challenging because their intrinsic open‐shell character high reactivity. Presented here is a hitherto unknown n‐PA, that is, peri‐heptacene ( 7‐PA ), which reactive zigzag edges are kinetically protected with eight 4‐tBu‐C 6 H 4 groups. The formation validated...
The incorporation of nanopores into graphene nanostructures has been demonstrated as an efficient tool in tuning their band gaps and electronic structures. However, precisely embedding the uniform nanoribbons (GNRs) at atomic level remains underdeveloped especially for in-solution synthesis due to lack synthetic strategies. Herein we report first case solution-synthesized porous GNR (pGNR) with a fully conjugated backbone via Scholl reaction tailor-made polyphenylene precursor (P1) bearing...