Fig. 1 TiO 2 nanotubes synthesized by different methods: a1 , a2 Assisted-template method, b1 , b2 hydrothermal treatment method, and c1 , c2 anodization method
Xiaoxing Zhang, Yingang Gui, Xingchen Dong
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Xiaoxing Zhang et. al. "Preparation and Application of TiO 2 Nanotube Array Gas Sensor for SF 6 -Insulated Equipment Detection: a Review", Nanoscale Research Letters <a rel="nofollow" class="external text" href="https://doi.org/10.1186/s11671-016-1516-4">doi:10.1186/s11671-016-1516-4</a>