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Studying the local character of Raman features of single-walled carbon nanotubes along a bundle using TERS.

Peica N, Thomsen C, Maultzsch J - Nanoscale Res Lett (2011)

Bottom Line: Moreover, using TERS we are able to position different single-walled carbon nanotubes along a bundle, by correlating the observed radial breathing mode (RBM) with the AFM topography at the measuring point.The frequency of the G- mode behaves differently in TERS as compared to far-field Raman.Using the RBM frequency, the diameters of the tubes were calculated and a very good agreement with the G--mode frequency was observed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr, 36, 10623 Berlin, Germany. peica@physik.tu-berlin.de.

ABSTRACT
Here, we show that the Raman intensity of the G-mode in tip-enhanced Raman spectroscopy (TERS) is strongly dependent on the height of the bundle. Moreover, using TERS we are able to position different single-walled carbon nanotubes along a bundle, by correlating the observed radial breathing mode (RBM) with the AFM topography at the measuring point. The frequency of the G- mode behaves differently in TERS as compared to far-field Raman. Using the RBM frequency, the diameters of the tubes were calculated and a very good agreement with the G--mode frequency was observed.

No MeSH data available.


Related in: MedlinePlus

TERS and confocal Raman intensities of the G+-mode (squares) and G--mode (stars) as a function of the height of the bundle at the seven measurement sites.
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Figure 4: TERS and confocal Raman intensities of the G+-mode (squares) and G--mode (stars) as a function of the height of the bundle at the seven measurement sites.

Mentions: On enlarging the bundle size (i.e., higher features in the AFM topography), an increase of the G-mode intensity is to be expected. This can be partly due to the presumably smaller distance between the tip and the nanotubes, for larger bundles. Undoubtedly, however, in a larger bundle there are more carbon nanotubes contributing to the recorded Raman signal. In contrast to the RBM, the G+ mode is only very slightly diameter-dependent, and the resonance window is much wider. Indeed, when plotting the G+ and G- intensities as a function of the bundle height, we observe an increased intensity with increasing height (see Figure 4).


Studying the local character of Raman features of single-walled carbon nanotubes along a bundle using TERS.

Peica N, Thomsen C, Maultzsch J - Nanoscale Res Lett (2011)

TERS and confocal Raman intensities of the G+-mode (squares) and G--mode (stars) as a function of the height of the bundle at the seven measurement sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211227&req=5

Figure 4: TERS and confocal Raman intensities of the G+-mode (squares) and G--mode (stars) as a function of the height of the bundle at the seven measurement sites.
Mentions: On enlarging the bundle size (i.e., higher features in the AFM topography), an increase of the G-mode intensity is to be expected. This can be partly due to the presumably smaller distance between the tip and the nanotubes, for larger bundles. Undoubtedly, however, in a larger bundle there are more carbon nanotubes contributing to the recorded Raman signal. In contrast to the RBM, the G+ mode is only very slightly diameter-dependent, and the resonance window is much wider. Indeed, when plotting the G+ and G- intensities as a function of the bundle height, we observe an increased intensity with increasing height (see Figure 4).

Bottom Line: Moreover, using TERS we are able to position different single-walled carbon nanotubes along a bundle, by correlating the observed radial breathing mode (RBM) with the AFM topography at the measuring point.The frequency of the G- mode behaves differently in TERS as compared to far-field Raman.Using the RBM frequency, the diameters of the tubes were calculated and a very good agreement with the G--mode frequency was observed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstr, 36, 10623 Berlin, Germany. peica@physik.tu-berlin.de.

ABSTRACT
Here, we show that the Raman intensity of the G-mode in tip-enhanced Raman spectroscopy (TERS) is strongly dependent on the height of the bundle. Moreover, using TERS we are able to position different single-walled carbon nanotubes along a bundle, by correlating the observed radial breathing mode (RBM) with the AFM topography at the measuring point. The frequency of the G- mode behaves differently in TERS as compared to far-field Raman. Using the RBM frequency, the diameters of the tubes were calculated and a very good agreement with the G--mode frequency was observed.

No MeSH data available.


Related in: MedlinePlus