Black Titanium Dioxide Nanomaterials in Photocatalysis

Figure 5

(a) Schematic illustration of the structure and electronic DOS of a disorder-engineered semiconductor nanocrystal with dopant incorporation. Dopants are depicted as black dots, and disorder is represented in the outer layer of the nanocrystal. E_C and E_V represent the conduction and valence levels of a bulk semiconductor, respectively. The intrinsic bands of the nanocrystal are shown at the left. The disorder-induced CB and VB tails extending into the otherwise forbidden levels are shown at the right. (b) Digital images of the white and black TiO₂ nanocrystals. (c and d) HRTEM images of the white and black TiO₂ nanocrystals. Reprinted with permission from [22]. Copyright (2011) American Association for the Advancement of Science.

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