Abstract
Site-selective deposition of highly oriented ZnO rod arrays was successfully achieved in an aqueous solution of zinc nitrate and hexamethyltetramine (C6H12N4) at low temperature. A patterned self-assembled monolayers (SAMs) surface was used as the template. ZnO nanorods were selectively deposited on the -CH3 terminated SAMs but were hindered on the OH-covered regions due to the preferential binding of C6H12N4−H+ complex with -OH endgroups. Continuous stirring during the reaction played a role in improving the crystal orientation and crystalline quality of ZnO nanorods. A little NH4Cl aqueous solution had a positive effect to increase the nucleation density of ZnO crystals, and thus enhance their order degree. These results provide a one-step process to fabricate micropatterns of thin films from a harmless substance at ordinary temperature and atmospheric pressure.
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