Use of reduction rate as a quantitative knob for controlling the twin structure and shape of palladium nanocrystals

Yi Wang, Hsin Chieh Peng, Jingyue Liu, Cheng Zhi Huang, Younan Xia

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Kinetic control is a powerful means for maneuvering the twin structure and shape of metal nanocrystals and thus optimizing their performance in a variety of applications. However, there is only a vague understanding of the explicit roles played by reaction kinetics due to the lack of quantitative information about the kinetic parameters. With Pd as an example, here we demonstrate that kinetic parameters, including rate constant and activation energy, can be derived from spectroscopic measurements and then used to calculate the initial reduction rate and further have this parameter quantitatively correlated with the twin structure of a seed and nanocrystal. On a quantitative basis, we were able to determine the ranges of initial reduction rates required for the formation of nanocrystals with a specific twin structure, including single-crystal, multiply twinned, and stacking fault-lined. This work represents a major step forward toward the deterministic syntheses of colloidal noble-metal nanocrystals with specific twin structures and shapes.

Original languageEnglish (US)
Pages (from-to)1445-1450
Number of pages6
JournalNano Letters
Volume15
Issue number2
DOIs
StatePublished - Feb 11 2015

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Keywords

  • Nanocrystals
  • kinetic control
  • palladium
  • twin structure

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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