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Journal of Nanoparticle Research

, Volume 13, Issue 2, pp 669–682 | Cite as

Polyol synthesis of polycrystalline cuprous oxide nanoribbons and their growth chemistry

  • Kang-Jung Lo
  • Hua-Yang Liao
  • Hsiu-Wei Cheng
  • Wei-Chun Lin
  • Bang-Ying Yu
  • Jing-Jong Shyue
  • Che-Chen Chang
Research paper

Abstract

A facile organic-solution method was developed for the synthesis of two-dimensional cuprous nanostructures. Ribbons as thin as 50 nm were successfully prepared by dissolving CuCl in ethylene glycol before raising the solution temperature to 150°C in air. Transmission electron microscopic studies revealed that the ribbon nanostructures obtained were polycrystalline, with nanocrystals present in the structures mostly less than 25 nm. Selective-area electron diffraction patterns taken from the ribbon nanostructures indicated that the chemical composition of the nanocrystals was Cu2O, though X-ray photoelectron spectrometric analysis showed that the nanostructures also contained the Cu2+ phase. Growth factors including the molecular structure of the solvent and the counter-ion of copper in the precursor that may affect the formation of polycrystalline nanoribbons were examined. More importantly, the detail of chemistry involved in the step-by-step, dimensional growth of copper-based nanostructures in ethylene glycol is presented at the molecular level for the first time using the growth of the Cu2O nanoribbon as an example. Ethylene glycol chelates Cu2+, which is produced from Cu+ undergoing disproportionation reactions, to form tetragonally elongated glycolates. A sequence of nucleophilic substitutions then takes place to bond glycolates together to yield stripe-like polymers before the polymers aggregate via van der Waals force into ribbon nanostructures. The Cu0 produced from the disproportionation reaction is crystallized out within the polymers and oxidized at elevated temperature by the dissolved O2 in the solution to form Cu2O nanocrystals.

Keywords

Ribbon nanostructures Organic-phase synthesis Cuprous polycrystalline Polyol synthesis Growth mechanism Octahedral glycolate Jahn–Teller distortion 

Notes

Acknowledgments

Financial support for this work was provided by ROC National Science Council (NSC95-2113-M-002-010, NSC96-2113-M-002-006, NSC97-2113-M-002-009-MY2) and Academia Sinica. We thank Prof. Ju-Chun Wang of Soochow University for helpful discussions.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Kang-Jung Lo
    • 1
    • 2
  • Hua-Yang Liao
    • 1
  • Hsiu-Wei Cheng
    • 1
  • Wei-Chun Lin
    • 2
  • Bang-Ying Yu
    • 1
    • 2
  • Jing-Jong Shyue
    • 2
    • 3
  • Che-Chen Chang
    • 1
  1. 1.Department of ChemistryNational Taiwan UniversityTaipeiTaiwan
  2. 2.Research Center for Applied Sciences, Academia SinicaTaipeiTaiwan
  3. 3.Department of Materials Science and EngineeringNational Taiwan UniversityTaipeiTaiwan

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