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(A) ZnO nanopropeller synthesized by vapor deposition; (B) Ostwald ripening utilized to prepare ZnO hollow spheres with double-yolk egg architectures; (C) Silica sphere templated synthesis for mesoporous anatase TiO2 hollow structure. [Reprinted with permission from reference Gao and Wang (2004). Copyright 2004 AIP. Reprinted with permission from reference Wang et al. (2012a). Copyright 2012 Wiley. Reprinted with permission from reference Joo et al. (2012). Copyright 2012 Wiley].
