Synthesis of ZnO nanowires with supercritical carbon dioxide and post heat treatment

Aaretti Kaleva (Corresponding Author), Juha Pekka Nikkanen, Saara Heinonen, Ville Saarimaa, Tommi Vuorinen, Mari Honkanen, Leo Hyvarinen, Erkki Levanen

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Zinc oxide (ZnO) nanowires are used in applications such as gas sensors and solar cells. This work presents a novel synthesis route for ZnO nanowires using supercritical carbon dioxide (scCO2) and post heat treatment. The method used scCO2 and a precursor solution as reactants to form nanowires on a galvanized surface. After the scCO2 treatment, the substrate was heat-treated. The surfaces were characterized with SEM, TEM, EDS, FTIR, XRD and optical spectroscopy. The FTIR results showed that the surface structure had changed from zinc hydroxycarbonate to ZnO during the heat treatment. The nanowires were slightly bent due to the heat treatment according to the SEM images. The presence of ZnO was further confirmed with XRD. The bandgap of the structure was determined by reflectance measurements and showed a value of 3.23 eV. The synthesis method presented in this study offers a unique approach into the formation of ZnO nanowires in a facile, rapid and environmentally friendly process.

Original languageEnglish
Article number445601
Issue number44
Publication statusPublished - 3 Sep 2018
MoE publication typeNot Eligible



  • corrosion
  • flower-like
  • hot-dip galvanized
  • nanoflower
  • scCO
  • zinc hydroxycarbonate
  • zinc oxide

Cite this

Kaleva, A., Nikkanen, J. P., Heinonen, S., Saarimaa, V., Vuorinen, T., Honkanen, M., Hyvarinen, L., & Levanen, E. (2018). Synthesis of ZnO nanowires with supercritical carbon dioxide and post heat treatment. Nanotechnology, 29(44), [445601].