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TEM images (a,b) at different magnifications of TiO2 synthesized by the solvothermal method (inset of b: electron diffraction pattern of a single TiO2 nanotube). SEM (c) and TEM (d) image of N‐doped TiO2 nanotubes fabricated by the solvothermal method. (a,b) Reproduced with permission.110 Copyright 2006, American Chemical Society. (c,d) Reproduced with permission.111 Copyright 2008, Royal Society of Chemistry.
