Web Release Date: October 17,
Facile Solution Route to Vertically Aligned, Selective Growth of ZnO Nanostructure Arrays
and
Department of Electrical and Computer Engineering, 4 Engineering Drive, and Engineering Science Programme, 9 Engineering Drive 1, National University of Singapore, Singapore 117576, and Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602
Received July 29, 2007
In Final Form: October 1, 2007
Abstract:
For any future cost-effective applications of inorganic nanostructures, in particular, hybrid photovoltaic cells, it is essential that these inorganic nanomaterials be solution processable and selectively printable. This letter reports the selective growth of single-crystal ZnO nanostructures based on the microcontact printing of an inorganic nanocrystal seeding film. The pattern-transfer quality is dependent on the concentration of the inking solution. Variable yet controllable anisotropic growth of ZnO nanowires has been demonstrated on the transferred patterns of ZnO nanocrystal films. The patterning and growth of these highly ordered arrays of ZnO nanostructures employ a simple soft lithography technique and mild reaction conditions at low temperature and in the absence of harmful organic additives.
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