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What dictates which ion, I or Br, mediates the growth of cubic Pd nanocrystals?

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Abstract

Cubic Pd nanocrystals (CPNCs) as one of typical nanostructures are generally fabricated using I or Br as capping ions. However, which ion, I or Br, exclusively mediates the growth of CPNCs in a given reaction system is not well understood. Herein, regardless of I or Br as the capping ion, we successfully achieved CPNCs in the same reaction system simply by adjusting the pH. Based on the Finke–Watzky kinetic model, an increase in pH accelerates the overall reduction rate of Pd2+, and the formation of CPNCs only occurs over the range of specific solution reduction rate constants (k1). This kinetically illuminates that the reduction rate of Pd2+ is the physicochemical parameter that determines which ion, I or Br, dictates the growth of CPNCs. Also, density functional theory (DFT) calculations further elucidate the dependence of the reduction rate of Pd2+ on pH and the configuration of the activated Pd2+ complex.

Graphical abstract: What dictates which ion, I− or Br−, mediates the growth of cubic Pd nanocrystals?

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Publication details

The article was received on 06 Feb 2018, accepted on 26 Mar 2018 and first published on 27 Mar 2018


Article type: Paper
DOI: 10.1039/C8CP00861B
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    What dictates which ion, I or Br, mediates the growth of cubic Pd nanocrystals?

    Z. Wang, Y. Wu, H. Xue, L. Zhou, W. Geng, H. Yi and Y. Li, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP00861B

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