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(A) TEM image of a single, Ag-decorated TiO2 nanotube with a diameter of 100 nm. The white arrow indicates the growth direction of a nanotube. (B) High-magnification image of the selected are, as marked by a dashed square in (A). (C) Enlarged view of a single AgNP, and (D) the corresponding EDS spectrum of AgNP and TiO2 nanotubes. Reproduced with permission from [226]. Copyright Public Library of Science, 2013.
