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 13 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[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

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

Hardian

Székely

2022

ChemSusChem

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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

show abstract

“…Carbon atoms can present three different forms of hybridization ( sp , , and ), and the way in which they can combine with other elements is the basis of countless research studies [ 1 , 2 ]. The combination of this element on a nanometric scale gave rise to structures called nanocarbons [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…According to their size and/or different topologies, these nanomaterials cause different reactivity when in contact with other substances [ 2 , 10 ], favored or not, according to the geometry of the nanomaterial, which varies according to the increase in the pyramidalization angle and misalignment of the 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, as we seek to improve and expand nanotechnological applications [ 5 , 10 – 12 ].…”

Section: Introductionmentioning

confidence: 99%

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

Aguiar,

Dattani,

Camps

2024

Discover Nano

View full text Add to dashboard Cite

For the development of nanofilters and nanosensors, we wish to know the impact of size on their geometric, electronic, and thermal stabilities. 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 to each other and to 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 peak positions from theoretical infrared spectra compared with experimental ones for all systems validates the methodology that we used. Our findings show that for the boron-nitride-based nanobelts, the calculated properties have an opposite monotonic relationship with the size of the systems, whereas for the carbon-based nanobelts, 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. High-temperature molecular dynamics also allowed us to contrast carbon-based systems with boron-nitride systems at various temperatures. In all cases, the properties vary with the increase in size of the nanobelts, indicating that it is possible to choose the desired values by changing the size and type of the systems. This work has many implications for future studies, for example our results show that carbon-based nanobelts did not break as we increased the temperature, whereas boron-nitride nanobelts had a rupture temperature that varied with their size; this is a meaningful result that can be tested when the use of more accurate simulation methods become practical for such systems in the future.

show abstract

Chemical Surface Modification and Characterization of Carbon Nanostructures Without Shape Damage

Cited by 13 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

Contact Info

Product

Resources

About