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. 2017 Mar 24;17(4):675. doi: 10.3390/s17040675

Figure 2.

Figure 2

Scanning electron microscope images of (a) top view of TiO2 nanotube array, (b) cross-section view of TiO2 nanotube array, (c) thin layer of molecularly-imprinted polypyrrole synthesized on a TiO2 nanotube array, (d) zoom of (c); and (e) thick polypyrrole film on the flat substrate.