Morphological control of heterostructured nanowires synthesized by sol-flame method

Runlai Luo, In Sun Cho, Yunzhe Feng, Lili Cai, Pratap M. Rao, Xiaolin Zheng

Research output: Contribution to journalArticlepeer-review

Abstract

Heterostructured nanowires, such as core/shell nanowires and nanoparticle-decorated nanowires, are versatile building blocks for a wide range of applications because they integrate dissimilar materials at the nanometer scale to achieve unique functionalities. The sol-flame method is a new, rapid, low-cost, versatile, and scalable method for the synthesis of heterostructured nanowires, in which arrays of nanowires are decorated with other materials in the form of shells or chains of nanoparticles. In a typical sol-flame synthesis, nanowires are dip-coated with a solution containing precursors of the materials to be decorated, then dried in air, and subsequently heated in the post-flame region of a flame at high temperature (over 900°C) for only a few seconds. Here, we report the effects of the precursor solution on the final morphology of the heterostructured nanowire using Co3O4 decorated CuO nanowires as a model system. When a volatile cobalt salt precursor is used with sufficient residual solvent, both solvent and cobalt precursor evaporate during the flame annealing step, leading to the formation of Co3O4 nanoparticle chains by a gas-solid transition. The length of the nanoparticle chains is mainly controlled by the temperature of combustion of the solvent. On the other hand, when a non-volatile cobalt salt precursor is used, only the solvent evaporates and the cobalt salt is converted to nanoparticles by a liquid-solid transition, forming a conformal Co3O4 shell. This study facilitates the use of the sol-flame method for synthesizing heterostructured nanowires with controlled morphologies to satisfy the needs of diverse applications.

Original languageEnglish (US)
Article number347
Pages (from-to)1-7
Number of pages7
JournalNanoscale Research Letters
Volume8
Issue number1
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • CuO nanowires
  • Flame synthesis
  • Heterostructured nanowires
  • Metal oxide nanowires
  • Sol-flame

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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