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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.

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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.


Calculated (from ref. [16]) and experimental TERS and confocal Raman G--mode frequencies as a function of the calculated tube diameter. The dashed lines are drawn to guide the eye and refer to the theoretical data. SEM, semiconducting; MET, metallic.
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Figure 5: Calculated (from ref. [16]) and experimental TERS and confocal Raman G--mode frequencies as a function of the calculated tube diameter. The dashed lines are drawn to guide the eye and refer to the theoretical data. SEM, semiconducting; MET, metallic.

Mentions: Further on we intend to correlate the observed G- peaks with the assigned RBMs. The G+ and G- peaks in semiconducting tubes correspond to the longitudinal (axial) and transverse (circumferential) optical vibrations, respectively, and vice versa in metallic nanotubes [14-16]. The G- peak in both metallic and semiconducting nanotubes is strongly diameter-dependent. Using the assignment of RBMs to the measured positions (1) to (7), we plot the observed G- frequencies as a function of tube diameters in Figure 5.


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)

Calculated (from ref. [16]) and experimental TERS and confocal Raman G--mode frequencies as a function of the calculated tube diameter. The dashed lines are drawn to guide the eye and refer to the theoretical data. SEM, semiconducting; MET, metallic.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Calculated (from ref. [16]) and experimental TERS and confocal Raman G--mode frequencies as a function of the calculated tube diameter. The dashed lines are drawn to guide the eye and refer to the theoretical data. SEM, semiconducting; MET, metallic.
Mentions: Further on we intend to correlate the observed G- peaks with the assigned RBMs. The G+ and G- peaks in semiconducting tubes correspond to the longitudinal (axial) and transverse (circumferential) optical vibrations, respectively, and vice versa in metallic nanotubes [14-16]. The G- peak in both metallic and semiconducting nanotubes is strongly diameter-dependent. Using the assignment of RBMs to the measured positions (1) to (7), we plot the observed G- frequencies as a function of tube diameters in Figure 5.

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.