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Spherical to truncated octahedral shape transformation of palladium nanocrystals driven by e-beam in aqueous solution

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Abstract

The crystallographic shapes of nanocrystals play critical roles in determining their physical and chemical properties. Liquid phase synthesis serves as one of the most important approaches for preparing shape-controlled nanocrystals, therefore, understanding the formation mechanisms of the thermodynamic equilibrium structures of nanocrystals in liquid solution is important. Using in situ liquid cell transmission electron microscopy (TEM), we observe for the first time the shape transformation of individual palladium nanocrystals from energy unfavored spherical shapes into equilibrium truncated octahedrons in aqueous solution. Via quantitative analysis of the shape evolution dynamics of an individual Pd nanocrystal, we find that about 10% of nanocrystal atoms were relocated during the shape transformation. The mass transport is attributed to the synergetic effect of electron beam irradiation and water environment.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51772265, 51761165024, and 61721005), the National Basic Research Program of China (No. 2015CB921004), the Zhejiang Provincial Nature Science Foundation (No. D19E020002), and the 111 project (No. B16042). Y. Y. J. acknowledges the support of the National Postdoctoral Program for Innovative Talents (No. BX201700208). This work made use of the resources of the Center of Electron Microscopy of Zhejiang University.

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Authors and Affiliations

  1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Yingying Jiang, Xiao Li, Xiaoming Ma, Haifeng Wang, Hui Zhang, Ze Zhang & Chuanhong Jin

  2. Department of Chemistry, Zhejiang University, Hangzhou, 310027, China

    Yingying Jiang

  3. Inorganic Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, 463-8560, Japan

    Zheng Liu

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  1. Yingying Jiang
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  2. Xiao Li
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  3. Xiaoming Ma
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  7. Ze Zhang
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Correspondence to Yingying Jiang or Chuanhong Jin.

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Jiang, Y., Li, X., Ma, X. et al. Spherical to truncated octahedral shape transformation of palladium nanocrystals driven by e-beam in aqueous solution. Nano Res. 12, 2623–2627 (2019). https://doi.org/10.1007/s12274-019-2498-1

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  • DOI: https://doi.org/10.1007/s12274-019-2498-1

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