Nano Archive

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

Lim, Byungkwon and Kobayashi, Hirokazu and Camargo, Pedro H. C. and Allard, Lawrence F. and Liu, Jingyue and Xia, Younan (2010) New insights into the growth mechanism and surface structure of palladium nanocrystals. Nano Research, 3 (3). pp. 180-188.

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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.

Item Type:Article
Subjects:Material Science > Nanostructured materials
Material Science > Nanochemistry
ID Code:9019
Deposited By:Lesley Tobin
Deposited On:14 May 2010 15:40
Last Modified:14 May 2010 15:40

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