Polyol syntheses of palladium decahedra and icosahedra as pure samples by maneuvering the reaction kinetics with additives

Hongwen Huang, Yi Wang, Aleksey Ruditskiy, Hsin Chieh Peng, Xin Zhao, Lei Zhang, Jingyue Liu, Zhizhen Ye, Younan Xia

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

This article reports a robust method based upon polyol reduction for the deterministic synthesis of Pd decahedra or icosahedra with tunable sizes and a purity approaching 100%. The success of such a selective synthesis relies on an ability to fine-tune the reaction kinetics through the addition of Na 2SO4 and HCl for decahedra and icosahedra, respectively. In the absence of any additive, the product of a similar synthesis in diethylene glycol contained 10% decahedra and 90% icosahedra. By optimizing the amount of Na2SO4 (or HCl) added into the reaction solution, the percent of decahedra (or icosahedra) in the product could be increased up to 100%. The roles of Na2SO4 and HCl were also investigated in great detail, and two plausible mechanisms were proposed and validated through a set of experiments. In general, a faster reduction rate is needed for the synthesis of Pd decahedra when compared with what is needed for Pd icosahedra. This work not only offers a simple approach to the deterministic syntheses of Pd decahedra and icosahedra but also provides an in-depth understanding of the mechanisms involved in shape-controlled syntheses of noble-metal nanocrystals from the perspective of reaction kinetics. On the basis of the mechanistic understanding, we have also achieved successful synthesis of Pd decahedra as pure samples by adding a proper amount of NaOH into the system to speed up the reduction kinetics.

Original languageEnglish (US)
Pages (from-to)7041-7050
Number of pages10
JournalACS nano
Volume8
Issue number7
DOIs
StatePublished - Jul 22 2014

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Keywords

  • decahedron
  • icosahedron
  • palladium
  • polyol synthesis
  • reaction kinetics

ASJC Scopus subject areas

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

Cite this

Huang, H., Wang, Y., Ruditskiy, A., Peng, H. C., Zhao, X., Zhang, L., Liu, J., Ye, Z., & Xia, Y. (2014). Polyol syntheses of palladium decahedra and icosahedra as pure samples by maneuvering the reaction kinetics with additives. ACS nano, 8(7), 7041-7050. https://doi.org/10.1021/nn501919e