Nano Research

, Volume 3, Issue 3, pp 180–188

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
Open AccessResearch Article

DOI: 10.1007/s12274-010-1021-5

Cite this article as:
Lim, B., Kobayashi, H., Camargo, P.H.C. et al. Nano Res. (2010) 3: 180. doi:10.1007/s12274-010-1021-5

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.

Keywords

Palladium nanocrystals growth coalescence surface evolution 
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Supplementary material

12274_2010_1021_MOESM1_ESM.pdf (192 kb)
Supplementary material, approximately 191 KB.

Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Byungkwon Lim
    • 1
  • Hirokazu Kobayashi
    • 1
  • Pedro H. C. Camargo
    • 1
  • Lawrence F. Allard
    • 2
  • Jingyue Liu
    • 3
  • Younan Xia
    • 1
  1. 1.Department of Biomedical EngineeringWashington UniversitySt. LouisUSA
  2. 2.Materials Science and Technology DivisionOak Ridge National LaboratoryOak RidgeUSA
  3. 3.Center for Nanoscience and Department of Chemistry and BiochemistryUniversity of Missouri-St. LouisSt. LouisUSA