High-pressure behavior of polyiodides confined into single-walled carbon nanotubes: A Raman study - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

High-pressure behavior of polyiodides confined into single-walled carbon nanotubes: A Raman study

Résumé

The high-pressure behavior of polyiodides confined into the hollow core of single-walled carbon nanotubes organized into bundles has been studied by means of Raman spectroscopy. Several regimes of the structural properties are observed for the nanotubes and the polyiodides under pressure. Raman responses of both compounds exhibit correlations over the whole pressure range (0–17 GPa). Modifications, in particular, take place, respectively, between 1 and 2.3 GPa for polyiodides and between 7 and 9 GPa for nanotubes, depending on the experiment. Differences between one experiment to another are discussed in terms of nanotube filling homogeneity. These transitions can be presumably assigned to the tube ovalization pressure and to the tube collapse pressure. A nonreversibility of several polyiodide mode modifications is evidenced and interpreted in terms of a progressive linearization of the iodine polyanions and a reduction in the charged species on pressure release. Furthermore, the significant change in the mode intensities could be associated to an enhancement of lattice modes, suggesting the formation of a new structure inside the nanotube. Changes in the nanotube mode positions after pressure release point out a decrease in the charge transfer in the hybrid system consistent with the observed evolution of the charged species.
Fichier principal
Vignette du fichier
Alvarez_06.pdf (824.32 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00534900 , version 1 (13-12-2019)

Identifiants

Citer

Laurent Alvarez, Jean-Louis Bantignies, Rozenn Le Parc, Raymond Aznar, Jean-Louis Sauvajol, et al.. High-pressure behavior of polyiodides confined into single-walled carbon nanotubes: A Raman study. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 82 (20), pp.205403. ⟨10.1103/PhysRevB.82.205403⟩. ⟨hal-00534900⟩
89 Consultations
82 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More