Ultralong and Mesoporous ZnO and γ-Al2O3 Oriented NanowiresObtained by Template-assisted Hydrothermal Approach

Carminna Ottone, Vivian Farías Rivera, Marco Fontana, Katarzyna Bejtka, Barbara Onida, Valentina Cauda

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16 Scopus citations

Abstract

Highly mesoporous ZnO and γ-Al2O3 nanowires (NWs) are both synthesized by a hydrothermal method using commercially available porous anodic aluminium oxide (AAO) as template. AAO membrane acts as template for ZnO NWs and both as template and precursor for γ-Al2O3 NWs. The formation of intermediate phases of porous Zn6Al2(OH)16CO3 and boehmite (γ-AlOOH) were observed, both occurring during the hydrothermal synthesis of porous ZnO and γ-Al2O3 NWs, respectively, and disappearing after annealing at 600°C. This novel template-assisted hydrothermal process leads to the formation of porous ZnO and γ-Al2O3 NWs (specific surface area of 192m2g-1 and 263m2g-1, respectively), showing pore sizes around 4nm in diameter. The influence of the reaction parameters on the nanostructure morphology was also investigated. A ZnO seed layer, deposited on the AAO channels prior to the hydrothermal synthesis, leads to more compact ZnO nanowires (99m2g-1) protecting the AAO host from the chemical attack of the precursor solution.

Original languageEnglish
Pages (from-to)1167-1173
Number of pages7
JournalJournal of Materials Science and Technology
Volume30
Issue number12
DOIs
StatePublished - 1 Dec 2014
Externally publishedYes

Keywords

  • Boehmite
  • Hydrothermal synthesis
  • Mesoporous ZnO nanowires
  • Mesoporous γ-AlO nanowires
  • Template-assisted method

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