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• W2091993428 abstract "We report the resonant Raman spectra of individualized $(=debundled)$ single-walled carbon nanotubes (SWNTs) having diameters $densuremath{sim}0.8--1.3phantom{rule{0.3em}{0ex}}mathrm{nm}$ subject to compression up to $10.5phantom{rule{0.3em}{0ex}}mathrm{GPa}$. Both SWNTs in water-surfactant dispersions as well as SWNTs deposited onto glass microfibers and compressed with methanol-ethanol were studied. In the low pressure regime $(<1phantom{rule{0.3em}{0ex}}mathrm{GPa})$, linear and reversible up-shifts of the Raman bands associated with the radial breathing vibrational mode (RBM) and tangential $G$ mode were observed. The pressure derivative of the RBM frequency increases with increasing $d$ and, unexpectedly, is larger for metallic than for semiconducting tubes. Above $1--2phantom{rule{0.3em}{0ex}}mathrm{GPa}$, RBM bands of additional SWNT species appear. This is due to pressure-induced shifts into resonance and broadening of the corresponding optical transitions. The latter could be quantified by photoluminescence (PL) measurements of the corresponding semiconducting tubes that are also reported here. Disappearance of the RBM and $G$ bands contributed by nanotubes with $densuremath{sim}0.8--0.9$ and $ensuremath{sim}1.2--1.3phantom{rule{0.3em}{0ex}}mathrm{nm}$ at $ensuremath{sim}10$ and $ensuremath{sim}4phantom{rule{0.3em}{0ex}}mathrm{GPa}$, respectively, is tentatively assigned to extensive radial deformation of the nanotubes, in accordance with theoretical predictions. After the application of several GPa pressure, a significant loss of Raman signals and a relative increase of the defect-induced $D$ band are found, in particular for metallic SWNTs. We attribute these and other irreversible effects in the Raman spectra to defects generated in nanotubes under compression (most likely via chemical processes). Comparable structural deterioration of semiconducting nanotubes is evidenced by strong irreversible changes in their PL spectra." @default.
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• W2091993428 date "2006-03-09" @default.
• W2091993428 modified "2023-10-14" @default.
• W2091993428 title "Raman study of individually dispersed single-walled carbon nanotubes under pressure" @default.
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• W2091993428 doi "https://doi.org/10.1103/physrevb.73.094109" @default.
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