Figure 4

The HR-TEM analysis of (i) the NiO nanoparticles, (ii) an individual MWCNT (inset: the SAED pattern of the MWCNT), (iii) the MWCNTs modified with NiO nanoparticles and (iv) an atomic-scale image of a nNiO-MWCNT (inset: lattice fringes of the MWCNT).