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Schematic model of formation of TNTs from different size of raw TiO2 particles (a). TEM images of TiO2 nanotubes synthesized at reaction temperature of 120 °C with sonication power of 0 W (b) and 7.6 W (c). FE‐SEM (d) and TEM (e) images of the rutile/TiO2 nanotubes. (a–c) Reproduced with permission.95 Copyright 2009, Elsevier. (d,e) Reproduced with permission.98 Copyright 2013, Elsevier.
