Adsorption and desorption phenomena on thermally annealed multi-walled carbon nanotubes by XANES study

Kamto, Camile Rodolphe Tchenguem; Sendja, Bridinette Thiodjio; Mane, Jeannot Mane

doi:10.1088/1674-1056/ab3437

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…Let us stress that the heat exchange through the annealed process has been shown to cause changes in the binding energy and the intensity of the adsorbates. Compared to our previous results [10,15], we note that the peaks A′′′, A′′′′ and P are not observed in our present spectra due to their extremely low resolution. Thus, we will focus only on the visible peaks in the following.…”

Section: Xanes Results Of Potassium Adsorbed Swcntscontrasting

confidence: 99%

“…The FTIR also showed that the functional groups at the surface of SWCNTs are principally OH − , C=O and C≡C. According to our previous results [10,15], the two dominant peaks near 265.94 eV (A) and 277.54 eV (B) were associated with an unoccupied π * and σ * band, respectively. The features corresponding to C and D respectively at 284,43 eV and 293.05 eV were associated with σ-symmetry while Ex.…”

Section: Xanes Results Of Potassium Adsorbed Swcntsmentioning

confidence: 54%

“…In the past decades, the sorption behavior of carbon nanotubes has been intensively studied [7][8][9][10]. Adsorption of the molecules and functionalization of covalent sidewall onto carbon nanotube (CNT) constitute another method of doping CNT nanomaterial.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous works, the investigation of binding energies, the intensity of CNTs annealed and unannealed in grazing incidence angle obtained by x-ray absorption near edge structure (XANES) show two categories of adsorbates [10,15]. On the one hand, the intrinsic adsorbates A′, A″, A″′, A″″ corresponding to gas molecules (H 2 O, CO, CO 2, O 2 ), and on the other hand the extrinsic adsorbates named P, P′ and P′ which are assigned to potassium (K) element [10,15]. These results are at the origin of our curiosity consisting of studying the adsorption capability of the SWCNTs to adsorb potassium and the electronic properties of the SWCNTs adsorbent materials.…”

Section: Introductionmentioning

confidence: 99%

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X-ray absorption near edge spectroscopy of the electronic structure of potassium adsorbed single walled carbon nanotubes

Kamto¹,

Sendja²,

Silenou³

et al. 2021

Phys. Scr.

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Carbon nanotubes (CNTs) show exceptional properties which make them extremely attractive for many applications. The electronic structure of potassium adsorbed single-walled carbon nanotubes (SWCNTs) is investigated by x-ray near edge structure (XANES) spectroscopy. Gas molecules (H 2 O, O 2 , CO 2 , CO) and potassium (K) adsorbates showed non negligible sensitivity to the geometry, thermal annealing treatment, and hybridization. The SWCNT type is shown by transmission electron microscopy (TEM) whereas an aleatory arrangement of SWCNTs and the spherical iron particles along carbon nanotubes are observed by scanning electron microscopy (SEM). XANES shows that the charge transfer effect in K-doping SWCNTs increases the conductivity to 62.7%. The adsorption study demonstrates that the adsorption mechanism to remove potassium from aqueous solutions using SWCNTs is assimilated to the ion exchange process. The functional groups OH − , C=O and C≡C are involved in the adsorption process. They are correlated to the assignment of the adsorbates given by XANES.

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Section: Xanes Results Of Potassium Adsorbed Swcntscontrasting

confidence: 99%

Section: Xanes Results Of Potassium Adsorbed Swcntsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X-ray absorption near edge spectroscopy of the electronic structure of potassium adsorbed single walled carbon nanotubes

Kamto¹,

Sendja²,

Silenou³

et al. 2021

Phys. Scr.

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Rolling structure from bilayer nanofilm by mismatch

Geng

Gao

et al. 2023

Chinese Phys. B

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A continuum theoretical scheme for self rolled-up nanotubes from bilayers by mismatch was obtained by considering surface elasticity, surface stress and symmetry lowering effects. For an ultrathin nanofilm with only several nanometers, isotropic mismatch and isotropic surface stress usually induce anisotropic rolling behavior. The isotropic Timoshenko formula should be modified anisotropically to interpret the mechanical behavior of anisotropic rolling structure of nanotubes accurately. The nanofilm rolled up in tangential direction while remain straight in cylindrical direction theoretically. Therefore, this paper considered the anisotropic shape of nanotubes. Along cylindrical direction, although it maintains straight and its residual strain is uniform, the stress varies through radial direction due to the Poisson’s effect of tangential strain. The applications of current theory to Si-Si nanotube, InAs-GaAs nanotube and InGaAs-Cr nanotube systems showed good agreement with experimental data. Besides surface elasticity and surface stress effects, the symmetry breaking and the anisotropic rolling structure are also of great importance in theoretical description of mechanical behavior of rolled-up nanotubes.

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Theoretical characterization of the adsorption configuration of pyrrole on Si(100) surface by x-ray spectroscopy

Li¹,

Jiang²,

Jiang³

et al. 2024

Chinese Phys. B

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The possible configurations of pyrrole absorbed on Si(100) surface have been investigated by x-ray photoelectron spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) spectra. The C-1s XPS and NEXAFS spectra of these adsorption configurations have been calculated by using the density functional theory (DFT) method and full-core hole (FCH) approximation to investigate the relationship between the adsorption configurations and the spectra. The result shows that the XPS and NEXAFS spectra are structurally dependent on the configurations of pyrrole absorbed on Si(100) surface. Compared with the XPS, the NEXAFS spectra are relatively highly sensitive to the adsorption configurations and can accurately identify them. The NEXAFS decomposition spectra produced by non-equivalent carbon atoms have also been calculated and show that the spectral features vary with the diverse types of carbon atoms and their structural environments.

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Adsorption and desorption phenomena on thermally annealed multi-walled carbon nanotubes by XANES study

Cited by 3 publications

References 21 publications

X-ray absorption near edge spectroscopy of the electronic structure of potassium adsorbed single walled carbon nanotubes

X-ray absorption near edge spectroscopy of the electronic structure of potassium adsorbed single walled carbon nanotubes

Rolling structure from bilayer nanofilm by mismatch

Theoretical characterization of the adsorption configuration of pyrrole on Si(100) surface by x-ray spectroscopy

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