A template and catalyst-free metal-etching-oxidation method to synthesize aligned oxide nanowire arrays: NiO as an example

Zhi Peng Wei, Miryam Arredondo, Hai Yang Peng, Zhou Zhang, Dong Lai Guo, Guo Zhong Xing, Yong Feng Li, Lai Mun Wong, Shi Jie Wang, Nagarajan Valanoor, Tao Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Although NiO Is one of the canonical functional binary oxides, there has been no report so far on the effective fabrication of aligned single crystalline NiO nanowire arrays. Here we report a novel vapor-based metal-etching-oxidation method to synthesize high-quality NiO nanowire arrays with good vertical alignment and morphology control. In this method, Ni foils are used as both the substrates and the nickel source; NiCl2 powder serves as the additional Ni source and provides Cl2 to initiate mild etching. No template is deliberately employed; instead a nanograined NiO scale formed on the NiO foil guides the vapor infiltration and assists the self-assembled growth of NiO nanowires via a novel process comprising simultaneous Cl2 etching and gentle oxidation. Furthermore, using CoO nanowires and Co-doped NiO as examples, we show that this general method can be employed to produce nanowires of other oxides as well as the doped counterparts.

Original languageEnglish (US)
Pages (from-to)4785-4791
Number of pages7
JournalACS Nano
Volume4
Issue number8
DOIs
StatePublished - Aug 24 2010

Keywords

  • Catalyst
  • Metal-etching-oxidation method
  • Nanowire
  • Nickel oxide
  • Self-assembly

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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