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

67 Citations (Scopus)

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 2010
Externally publishedYes

Fingerprint

Palladium
Surface structure
Nanocrystals
Transmission electron microscopy
Adatoms
Ascorbic acid
High resolution transmission electron microscopy
Aberrations
Coalescence
Bromides
Particles (particulate matter)
Ascorbic Acid
Vacancies
Annealing
Ions
Defects
Scanning electron microscopy

Keywords

  • Coalescence
  • Growth
  • Nanocrystals
  • Palladium
  • Surface evolution

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)

Cite this

New insights into the growth mechanism and surface structure of palladium nanocrystals. / Lim, Byungkwon; Kobayashi, Hirokazu; Camargo, Pedro H C; Allard, Lawrence F.; Liu, Jingyue; Xia, Younan.

In: Nano Research, Vol. 3, No. 3, 03.2010, p. 180-188.

Research output: Contribution to journalArticle

Lim, Byungkwon ; Kobayashi, Hirokazu ; Camargo, Pedro H C ; Allard, Lawrence F. ; Liu, Jingyue ; Xia, Younan. / New insights into the growth mechanism and surface structure of palladium nanocrystals. In: Nano Research. 2010 ; Vol. 3, No. 3. pp. 180-188.
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