Chemical Surface Modification and Characterization of Carbon Nanostructures Without Shape Damage

Pedrosa, Maria Clara Guimarães; Filho, José Carlos Dutra; Menezes, Lívia Rodrigues de; Silva, Emerson Oliveira da

doi:10.1590/1980-5373-mr-2019-0493

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…[18] Fullerene has been reported to be thermally stable above 600 °C under a nitrogen atmosphere. [19,20] The thermal stability of pristine fullerenes can be observed from their thermogravimetric analysis (TGA) profiles, where almost no thermal degradation occurred below 600 °C (Figure S2a). Therefore, fullerene retained its structure upon pyrolysis up to 600 °C (Figure 1b).…”

Section: Resultsmentioning

confidence: 99%

Multistep Transformation from Amorphous and Nonporous Fullerenols to Highly Crystalline Microporous Materials

Hardian

Székely

2022

ChemSusChem

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The structural and morphological properties of fullerenols upon exposure to heat treatment have yet to be understood. Herein, the temperature‐driven structural and morphological evolutions of fullerenols C60(OH) and C70(OH) were investigated. In situ spectroscopic techniques, such as variable‐temperature X‐ray diffraction and coupled thermogravimetric Fourier‐transform infrared analysis, were used to elucidate the structural transformation mechanism of fullerenols. Both fullerenols underwent four‐step structural transformation upon heating and cooling, including amorphous‐to‐crystalline transition, thermal expansion, structural compression, and new crystal formation. Compared to the initially nonporous amorphous fullerenol, the crystalline product exhibited microporosity with a surface area of 114 m2 g−1 and demonstrated CO2 sorption capability. These findings show the potential of fullerene derivatives as adsorbents.

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Section: Resultsmentioning

confidence: 99%

Multistep Transformation from Amorphous and Nonporous Fullerenols to Highly Crystalline Microporous Materials

Hardian

Székely

2022

ChemSusChem

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“…17.5-20.5° corresponding to diffraction from PPV are also observed in the case of other composites. Additionally, diffraction peaks at 2θ of 26.53°(interlayer distance of 0,34) and 25.66° (interlayer distance of 0,35) corresponding to (002) plane of graphene layers stacks are observed for PPV/GNPL [58] and PPV/MWCNT [59] composites, respectively. The greater interlayer distance for GO compared to GNPLs or MWCNTs, calculated from Bragg's law for the (002) plane, indicates incorporation of many oxygen functional groups between the carbon layers in GO.…”

Section: Structure and Morphology Of Ppv Compositesmentioning

confidence: 97%

Poly(p-phenylene vinylene) incorporated into carbon nanostructures

et al. 2022

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Composites of poly(p-phenylene vinylene) (PPV) and different carbon nanostructures, such as fullerene C60, multi-walled carbon nanotubes (MWCNTs), single-walled carbon nanotubes (SWCNTs), graphene oxide (GO), and graphene nanoplatelets (GNPLs), were produced by Wittig’s soluble precursor procedure in solutions containing dispersed particles of carbon nanomaterials. These composites were investigated using infrared and Raman spectroscopy, scanning and transmission electron microscopy, thermogravimetry analysis, adsorption/desorption of N2 measurement, and electrochemistry. Composites are produced in the form of nanostructural porous materials. A significant increase in the BET (Brunauer–Emmett–Teller) surface is observed for composites in comparison to unmodified PPV. The highest BET surface area of 125 m2·g−1 was obtained for the PPV/SWCNT composite. Compared to pristine PPV, composites also exhibit higher thermal stability. The effect of the content of composite components on their electrochemical properties was also investigated. The electronic interaction between components of composite significantly affects their electrochemical properties, particularly in the case of oxidation processes. PPV incorporated into network of carbon nanostructures exhibit two well separated oxidation steps. The carbon component is responsible for the shift of the PPV reduction and oxidation processes toward less negative and less positive potentials, respectively, significantly lowering the energy of the band gap. Graphical abstract

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“…Such structures have attracted interest for promising applications in nanobiomedicine [5; 6] and optoelectronics [7; 8]. According to the size and/or different topologies these nanomaterials cause different reactivity in contact with other materials [2; 9], favored or not, according to the geometry of the nanomaterial, which varies according to the increase in the pyramidalization angle and misalignment of the π orbitals between the C atoms [2]. Thus, different syntheses and functionalization have been carried out to obtain different nanostructures to achieve greater compatibility with other materials, seeking to improve and expand nanotechnological applications [5; 9-11].…”

Section: Introductionmentioning

confidence: 99%

Electronic and structural properties of Möbius boron-nitride and carbon nanobelts

C.¹,

N.²,

Camps³

2023

Preprint

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Using the semiempirical tight binding method as implemented in the xTB program, we characterized Möbius boron-nitride and carbon-based nanobelts with different sizes and compared them with normal nanobelts. The calculated properties include the infrared spectra, the highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), the energy gap, the chemical potential, and the molecular hardness.The agreement between the peaks positions from theoretical infrared spectra compared with experimental ones for all systems, validate the used methodology. Our findings show that for the boron-nitride based nanobelts, the calculated properties have opposite monotonic relationship with the size of the systems whereas, for the carbon-based, the properties show the same monotonic relationship for both types of nanobelts. Also, the torsion presented on the Möbius nanobelts, in the case of boron-nitride, induced an inhomogeneous surface distribution for the HOMO orbitals. In all cases, the properties vary with the increase in the size of the nanobelts indicating that it is possible to choose the desired values by changing the size and type of the systems.

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Chemical Surface Modification and Characterization of Carbon Nanostructures Without Shape Damage

Cited by 9 publications

References 36 publications

Multistep Transformation from Amorphous and Nonporous Fullerenols to Highly Crystalline Microporous Materials

Multistep Transformation from Amorphous and Nonporous Fullerenols to Highly Crystalline Microporous Materials

Poly(p-phenylene vinylene) incorporated into carbon nanostructures

Electronic and structural properties of Möbius boron-nitride and carbon nanobelts

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