Hydrothermal-electrochemical synthesis of ZnO nanorods

Seong Kyong Park, Jae Hyoung Park, Ki Young Ko, Sungho Yoon, Kyo Seon Chu, Woong Kim, Young Rag Do

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Abstract

Vertically aligned ZnO nanorods having high optical quality were prepared by a hydrothermal-electrochemical method. The nanorods were synthesized in a Zn(NO3)2 aqueous solution on Si substrates which were coated with a platinum conducting layer and a ZnO seed layer. They possessed a single-crystal würtzite structure and grew along the c-axis, perpendicular to the substrates. The height and diameter of the ZnO nanorods were up to ̃4.3 μm and 90-150 nm, respectively. The morphological, structural, and photoluminescence properties of the ZnO nanorods were examined with respect to the growth temperature (120-180 °C) and the presence of NaOH additive. The nanorods synthesized at high temperature (180 °C) exhibited a strong UV emission and a weak defect-related visible emission leading to a UV-visible ratio of ̃230. This high optical quality was attributed to the increased growth rate of ZnO nanorods (̃4.3 μm/h) which was caused by the high growth temperature (180 °C). This was based on the fact that the ZnO phase is thermodynamically more favorable than the defect-related Zn(OH)2 phase at higher temperature. Since the growth temperature was compatible with polymer materials, our synthetic method may provide a promising way for fabricating high performance optoelectronic devices on flexible polymer substrates.

Original languageEnglish
Pages (from-to)3615-3620
Number of pages6
JournalCrystal Growth and Design
Volume9
Issue number8
DOIs
Publication statusPublished - 2009 Aug 5

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Park, S. K., Park, J. H., Ko, K. Y., Yoon, S., Chu, K. S., Kim, W., & Do, Y. R. (2009). Hydrothermal-electrochemical synthesis of ZnO nanorods. Crystal Growth and Design, 9(8), 3615-3620. https://doi.org/10.1021/cg9003593