Nanosphere Lithography: A Powerful Method for the Controlled Manufacturing of Nanomaterials

Figure 28

ZnO nanowire arrays grown via the “templated growth” route trough a sacrificial layer of polystyrene nanospheres, showing controllable and reversible wetting properties. (a) Cross-section SEM micrograph showing the as-grown ZnO nanowires through the polystyrene nanospheres. (b) SEM micrograph of the ZnO nanowires after removal of the polystyrene template, highlighting a hexagonal symmetry. The inset scale bar is 500 nm. (c) Reversible hydrophobicity to superhydrophilicity by successive UV illumination and dark storage or annealing (CA: contact angle). “Adapted with permission from [109]. Copyright (2011) American Chemical Society.”