Figure 1
HRTEM image of the Gd-DTPA functionalized MWNTs. (a) The red arrows indicate regions along the nanotube that have strand like filament structures, believed to be a result of the DTPA ligand attachment. These strands are generally in close proximity to the multiple Gd3+ centers. (b) The MWNTs show a fairly homogenous distribution of the Gd-DTPA attachment throughout the sample, forming a network-like cover of the outer wall; distances between centres are indicated by the yellow arrows. (c) Multiple Gd-DTPA centres separated by a distance greater than 10 nm are indicated by the arrows. (d) Morphology of aggregated centres viewed under higher magnification circled.
