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Effect of nanoparticles on the thermal properties of decorated multiwall carbon nanotubes: A Raman investigation
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Image of FIG. 1.
FIG. 1.

SEM images of MWNTs decorated with nanoparticles from decorated MWNTs samples A–D as described in Table I.

Image of FIG. 2.
FIG. 2.

TEM images of nanoparticles attached to the walls of MWNTs. A single isolated nanoparticle from sample B (a) and C (b); and a large aggregate from sample B (c) and C (d).

Image of FIG. 3.
FIG. 3.

Raman spectra in the spectral range of (a) and (b) MWNTs Raman active modes using . Anatase powder is used as a reference for and pristine MWNTs, as a reference for decorated MWNTs samples A–D.

Image of FIG. 4.
FIG. 4.

Excitation intensity dependence of the wave number of (a) the Raman peak from sample D; and (b) the G-band from three MWNTs samples, including a pristine and two decorated samples (A and D).

Image of FIG. 5.
FIG. 5.

Raman results from pristine and decorated MWNTs (samples A–D) under low and high excitation intensities. The horizontal axis corresponds to the G-band wave number and the vertical axis corresponds to the intensity ratio of the and the G-Raman peaks . The ratio is only presented for samples C and D under . Otherwise, the G-band wave numbers are presented along vertically displaced horizontal axis in order to make it easier to observe all data points.

Image of FIG. 6.
FIG. 6.

Relative intensity of the D and G MWNT Raman bands from various measurements on pristine, acid-treatment and decorated MWNT samples under .


Generic image for table
Table I.

Details of the experimental procedures used in the in situ growth of nanoparticles on the MWNTs surfaces.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of TiO2 nanoparticles on the thermal properties of decorated multiwall carbon nanotubes: A Raman investigation