%0 Journal Article %1 WOS:000310841100005 %A Aguiar, A L %A San-Miguel, A %A Barros, E B %A Kalbac, M %A Machon, D %A Kim, Y A %A Muramatsu, H %A Endo, M %A Filho, A G Souza %C ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA %D 2012 %I AMER PHYSICAL SOC %J PHYSICAL REVIEW B %K imported %N 19 %R 10.1103/PhysRevB.86.195410 %T Effects of intercalation and inhomogeneous filling on the collapse pressure of double-wall carbon nanotubes %V 86 %X The vibrational and structural properties of modified double-wall carbon nanotubes (DWNTs) were investigated by high-pressure resonance Raman scattering. We studied bromine-intercalated DWNTs grown by chemical vapor deposition (CVD) and C-13(60) peapod-derived DWNTs in comparison with pristine CVD-grown DWNTs. The effects of chemical modification, carbon interwall geometry, and inhomogeneous filling on the high-pressure evolution of the DWNTs have been investigated. We find that the mechanical resistance of the DWNT system is affected both in the case of bromine-intercalated CVD-DWNTs and also for the C-13(60) peapod-derived DWNTs, thus lowering the onset of collapse pressure P-c((onset)) compared with pristine CVD-DWNTs. For bromine CVD-DWNTs, P-c((onset)) was observed to be 13 GPa, well below the 21 GPa found for pristine CVD-DWNTs. Uniaxial constrains in the interstitial regions of the DWNT bundle due to the presence of bromine arrangements explains this mechanical instability rather than a charge transfer process. Isotopic C-13 enrichment of the inner tube reduces the frequency of its tangential contribution to the G-band Raman spectrum, which appears to be an effective method to separate the contribution of inner- and outer-tube G(+) components during pressure evolution. P-c((onset)) was found to be 12 GPa for the C-13(60)-derived DWNT system. In this case, the instability of the DWNT is mainly due to the high inhomogeneous filling of the outer tube, as a consequence of the conversion method used to produce the inner-wall nanotube from the peapods, which produces inner tubes which are usually shorter than the outer tubes, leading to the outer tube not being completely filled.

@article{WOS:000310841100005, abstract = {The vibrational and structural properties of modified double-wall carbon nanotubes (DWNTs) were investigated by high-pressure resonance Raman scattering. We studied bromine-intercalated DWNTs grown by chemical vapor deposition (CVD) and C-13(60) peapod-derived DWNTs in comparison with pristine CVD-grown DWNTs. The effects of chemical modification, carbon interwall geometry, and inhomogeneous filling on the high-pressure evolution of the DWNTs have been investigated. We find that the mechanical resistance of the DWNT system is affected both in the case of bromine-intercalated CVD-DWNTs and also for the C-13(60) peapod-derived DWNTs, thus lowering the onset of collapse pressure P-c((onset)) compared with pristine CVD-DWNTs. For bromine CVD-DWNTs, P-c((onset)) was observed to be 13 GPa, well below the 21 GPa found for pristine CVD-DWNTs. Uniaxial constrains in the interstitial regions of the DWNT bundle due to the presence of bromine arrangements explains this mechanical instability rather than a charge transfer process. Isotopic C-13 enrichment of the inner tube reduces the frequency of its tangential contribution to the G-band Raman spectrum, which appears to be an effective method to separate the contribution of inner- and outer-tube G(+) components during pressure evolution. P-c((onset)) was found to be 12 GPa for the C-13(60)-derived DWNT system. In this case, the instability of the DWNT is mainly due to the high inhomogeneous filling of the outer tube, as a consequence of the conversion method used to produce the inner-wall nanotube from the peapods, which produces inner tubes which are usually shorter than the outer tubes, leading to the outer tube not being completely filled.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, author = {Aguiar, A L and San-Miguel, A and Barros, E B and Kalbac, M and Machon, D and Kim, Y A and Muramatsu, H and Endo, M and Filho, A G Souza}, biburl = {https://www.bibsonomy.org/bibtex/26cf27030253296889756a51da3b614ee/ppgfis_ufc_br}, doi = {10.1103/PhysRevB.86.195410}, interhash = {4be42ab7970a527ce29ded9f42363bcf}, intrahash = {6cf27030253296889756a51da3b614ee}, issn = {1098-0121}, journal = {PHYSICAL REVIEW B}, keywords = {imported}, number = 19, publisher = {AMER PHYSICAL SOC}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Effects of intercalation and inhomogeneous filling on the collapse pressure of double-wall carbon nanotubes}, tppubtype = {article}, volume = 86, year = 2012 }