404159.fig.004a
(a)
404159.fig.004b
(b)
404159.fig.004c
(c)
404159.fig.004d
(d)
Figure 4: TEM images of the as-prepared composite nanostructures based on CNTs and Pt NPs and coated with silica, heated up to 550°C ((a) and (b)) and to 800°C ((c) and (d)).