The effect of solvent on the morphology of ZnO nanostructure assembly by dielectrophoresis and its device applications

Vera La Ferrara, Aneesh Pacheri Madathil, Anna De Girolamo Del Mauro, Ettore Massera, Tiziana Polichetti, Gabriella Rametta

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Abstract

Different zinc oxide nanostructured morphologies were grown on photolithographically patterned silicon/silicon dioxide substrates by dielectrophoresis technique using different solvents, such as water and ethanol, obtaining rod-like and net-like nanostructures, respectively. The formation of continuous nanostructures was confirmed by scanning electron microscopic, atomic force microscopic images, and electrical characterizations. The rod-like zinc oxide nanostructures were observed in the 10 μm gap between the fingers in the pattern, whereas net-like nanostructures were formed independently of microgap. A qualitative study about the mechanism for the assembly of zinc oxide continuous nanostructures was presented. Devices were electrically characterized, at room temperature, in controlled environment to measure the conductance behavior in ultraviolet and humidity environment. Devices based on zinc oxide nanostructures grown in ethanol medium show better responses under both ultraviolet and humidity, because of the net-like structure with high surface-to-volume ratio. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish
Pages (from-to)2086 - 2093
Number of pages8
JournalElectrophoresis
Volume33
Issue number14
DOIs
Publication statusPublished - Jul 2012

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All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Clinical Biochemistry

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