New insights into the growth mechanism and surface structure of palladium nanocrystals

Byungkwon Lim, Hirokazu Kobayashi, Pedro H.C. Camargo, Lawrence F. Allard, Jingyue Liu, Younan Xia

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

This paper presents a systematic study of the growth mechanism for Pd nanobars synthesized by reducing Na2PdCl4 with L-ascorbic acid in an aqueous solution in the presence of bromide ions as a capping agent. Transmission electron microscopy (TEM) and high-resolution TEM analyses revealed that the growth at early stages of the synthesis was dominated by particle coalescence, followed by shape focusing via recrystallization and further growth via atomic addition. We also investigated the detailed surface structure of the nanobars using aberration-corrected scanning TEM and found that the exposed {100} surfaces contained several types of defects such as an adatom island, a vacancy pit, and atomic steps. Upon thermal annealing, the nanobars evolved into a more thermodynamically favored shape with enhanced truncation at the corners.

Original languageEnglish (US)
Pages (from-to)180-188
Number of pages9
JournalNano Research
Volume3
Issue number3
DOIs
StatePublished - Mar 1 2010
Externally publishedYes

Keywords

  • Coalescence
  • Growth
  • Nanocrystals
  • Palladium
  • Surface evolution

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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