Resumen: A double-walled carbon nanotube (DWNT), a coaxial composite of two single-walled carbon nanotubes (SWNT), provides a unique model to study interactions between the two constituent SWNTs. Combining high resolution transmission electron microscopy (HRTEM), electron diffraction (ED), and resonant Raman scattering (RRS) experiments on the same individual suspended DWNT is the ultimate way to relate unambiguously its atomic structure, defined by the chiral indices of the coaxial outer/inner SWNTs, and its Raman-active vibration modes. This approach is used to investigate the intertube distance dependence of the G-modes of individual index-identified DWNTs composed of two semiconducting SWNTs. We state the main features of the dependence of the G-mode frequencies on the distance between the inner and outer layers: (i) When the interlayer distance is larger than the nominal van der Waals distance (close to 0.34 nm), a downshift of the inner-layer G-modes with respect to the G-modes in the equivalent SWNTs is measured. (ii) The amplitude of the downshift depends on the interlayer distance, or in other words, on the negative pressure felt by the inner layer in DWNT. (iii) No shift is observed for an intertube distance close to 0.34 nm. Idioma: Inglés DOI: 10.1021/acs.jpcc.5b05888 Año: 2015 Publicado en: Journal of Physical Chemistry C 119, 40 (2015), 23196-23202 ISSN: 1932-7447 Factor impacto JCR: 4.509 (2015) Categ. JCR: CHEMISTRY, PHYSICAL rank: 30 / 144 = 0.208 (2015) - Q1 - T1 Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 39 / 271 = 0.144 (2015) - Q1 - T1 Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 22 / 83 = 0.265 (2015) - Q2 - T1 Factor impacto SCIMAGO: 1.886 - Electronic, Optical and Magnetic Materials (Q1) - Energy (miscellaneous) (Q1) - Surfaces, Coatings and Films (Q1) - Physical and Theoretical Chemistry (Q1) - Nanoscience and Nanotechnology (Q1)