Figure 3.

TEM images. TiO2 nanotubes imbedded with MPA-DT-capped AuNPs: (a to d) thick-walled nanotubes; (e,f) thin-walled nanotubes; and (g,h) thin-walled nanotubes after being heated at 250°C for 30 min. The imbedded AuNPs can be seen with the guide of white arrows.

Zhang et al. Nanoscale Research Letters 2012 7:295   doi:10.1186/1556-276X-7-295
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