Figure 2

TEM images of CNTs doped by energetic Ag ions at a dose of 3 × 10¹⁶ cm⁻²; a TEM image of CNTs doped by energetic Ag ions, in which two different structures, i.e. nanowire and nanotube, have been observed, it demonstrates that the CNW/CNT hetero nanostructures have been formed in the nanoarray; b HRTEM image of A region in image (a), which shows the Ag nanoparticles embedded in the amorphous carbon substrate; c HRTEM image of B region in image (a), which shows CNT structures clearly