SEM images of MWNTs decorated with nanoparticles from decorated MWNTs samples A–D as described in Table I.
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).
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.
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).
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.
Relative intensity of the D and G MWNT Raman bands from various measurements on pristine, acid-treatment and decorated MWNT samples under .
Details of the experimental procedures used in the in situ growth of nanoparticles on the MWNTs surfaces.
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