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Mapping of individual carbon nanotubes in polymer/nanotube composites using electrostatic force microscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic illustration of the spin-cast polymer/SWCNT sample and EFM operation of a SPM. (b) AFM image of the surface topography of a thick film of PMMA/SWCNT composite. Due to the polymer the tubes cannot be observed, however, in the corresponding EFM image (, ) in panel (c) individual embedded SWCNT are clearly seen as dark lines. (d) The distribution of the lengths and orientation (inset) of 95 embedded SWCNTs measured in a , area of the sample. The angle is measured with respect to the horizontal direction in (c).

Image of FIG. 2.
FIG. 2.

(Color online) (a) EFM image showing two SWCNTs embedded in a thick film of SWCNT/PMMA composite. (b) The lift-height dependence of the length-corrected EFM signal of the two tubes in (a). The measurements were performed at the points indicated in (a). The measured amplitudes have been fitted to . The inset shows vs nanotube length for 30 isolated SWCNTs measured with known tip-tube separation . The red line shows a fit to the theoretical prediction . (c) A projection view of the three dimensional map of the two nanotubes as inferred from the data in (a) and (b). The blue region illustrates the PMMA matrix.

Image of FIG. 3.
FIG. 3.

(a) Graph showing the combinations of CNT length and effective tip-tube separation which are observable with the EFM technique (shaded area). The graph is calculated using the parameters of the fits in Fig. 2(b) and hatched region illustrates the uncertainty (due to the uncertainty in the values of the fits). (b) The FWHM of the Lorentzian fit to the EFM signal of as a function of the lift height. The solid line is a linear fit.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mapping of individual carbon nanotubes in polymer/nanotube composites using electrostatic force microscopy