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SEM images (a) of TiO2 nanotubes after CQD deposition. (b) The schematic diagram of the sensitization mechanism of the CQDs deposited on the surface TiO2 nanotubes. The top (c) and cross‐section (d) of GO/TiO2 composite nanotube arrays. (a,b) Reproduced with permission.205 Copyright 2013, Royal Society of Chemistry. (c,d) Reproduced with permission.206 Copyright 2012, Royal Society of Chemistry.
