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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 intensity as a function of the position along the SWCNT bundle and bundle height, exemplified on RBM_7. (a) TERS spectra in the RBM region at different positions, from (1) to (7) along the SWCNT bundle. The peaks marked with stars belong to the silicon substrate. The colored numbers correspond to the RBM numbering given in Table 2. (b) RBM_7 TERS intensity as a function of the height of the bundle at the seven measurements sites.
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Figure 2: TERS intensity as a function of the position along the SWCNT bundle and bundle height, exemplified on RBM_7. (a) TERS spectra in the RBM region at different positions, from (1) to (7) along the SWCNT bundle. The peaks marked with stars belong to the silicon substrate. The colored numbers correspond to the RBM numbering given in Table 2. (b) RBM_7 TERS intensity as a function of the height of the bundle at the seven measurements sites.

Mentions: In order to explain the appearance of different RBMs for each measured region, we will attempt to correlate each RBM with the corresponding AFM topography. In Figure 2, we see that RBM_7 is observed in the TERS spectra at each of the considered sites. This enables us to attribute its corresponding SWCNT to bundle (A) (Figure 1). Its intensity varies longwise the measured positions, becoming stronger at positions (3) and (4), in accordance with the corresponding height profiles (Table 1) of the nanostructure (A) (Figure 1).


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 intensity as a function of the position along the SWCNT bundle and bundle height, exemplified on RBM_7. (a) TERS spectra in the RBM region at different positions, from (1) to (7) along the SWCNT bundle. The peaks marked with stars belong to the silicon substrate. The colored numbers correspond to the RBM numbering given in Table 2. (b) RBM_7 TERS intensity as a function of the height of the bundle at the seven measurements sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: TERS intensity as a function of the position along the SWCNT bundle and bundle height, exemplified on RBM_7. (a) TERS spectra in the RBM region at different positions, from (1) to (7) along the SWCNT bundle. The peaks marked with stars belong to the silicon substrate. The colored numbers correspond to the RBM numbering given in Table 2. (b) RBM_7 TERS intensity as a function of the height of the bundle at the seven measurements sites.
Mentions: In order to explain the appearance of different RBMs for each measured region, we will attempt to correlate each RBM with the corresponding AFM topography. In Figure 2, we see that RBM_7 is observed in the TERS spectra at each of the considered sites. This enables us to attribute its corresponding SWCNT to bundle (A) (Figure 1). Its intensity varies longwise the measured positions, becoming stronger at positions (3) and (4), in accordance with the corresponding height profiles (Table 1) of the nanostructure (A) (Figure 1).

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