Figure 1.

Cross-sectional SEM and TEM images and plan view of nanotube arrays. Top image, cross-sectional SEM image showing the fabricated TiO2 nanotubes with an ITO electrode on the top surface. Center image, plan view TEM images of TiO2 nanotube arrays. Bottom image, cross-sectional TEM images for the TiO2 nanotube arrays.

Chang et al. Nanoscale Research Letters 2012 7:231   doi:10.1186/1556-276X-7-231
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