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

Abstract

Our paper presents a systematic study of the growth mechanism for Pd nanobars synthesized by reducing Na 2PdCl 4 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 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.

Authors:
 [1];  [1];  [1];  [2];  [3];  [1]
  1. Washington Univ., St. Louis, MO (United States). Dept. of Biomedical Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Univ. of Missouri, St. Louis, MO (United States). Center for Nanoscience and Dept. of Chemistry and Biochemistry
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Temperature Materials Lab. (HTML)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1364252
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nano Research
Additional Journal Information:
Journal Volume: 3; Journal Issue: 3; Journal ID: ISSN 1998-0124
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; Palladium; nanocrystals; growth; coalescence; surface evolution; aberration-corrected; electron microscopy

Citation Formats

Lim, Byungkwon, Kobayashi, Hirokazu, Camargo, Pedro H. C., Allard, Lawrence F., Liu, Jingyue, and Xia, Younan. New insights into the growth mechanism and surface structure of palladium nanocrystals. United States: N. p., 2010. Web. doi:10.1007/s12274-010-1021-5.
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. United States. doi:10.1007/s12274-010-1021-5.
Lim, Byungkwon, Kobayashi, Hirokazu, Camargo, Pedro H. C., Allard, Lawrence F., Liu, Jingyue, and Xia, Younan. Wed . "New insights into the growth mechanism and surface structure of palladium nanocrystals". United States. doi:10.1007/s12274-010-1021-5. https://www.osti.gov/servlets/purl/1364252.
@article{osti_1364252,
title = {New insights into the growth mechanism and surface structure of palladium nanocrystals},
author = {Lim, Byungkwon and Kobayashi, Hirokazu and Camargo, Pedro H. C. and Allard, Lawrence F. and Liu, Jingyue and Xia, Younan},
abstractNote = {Our 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 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.},
doi = {10.1007/s12274-010-1021-5},
journal = {Nano Research},
number = 3,
volume = 3,
place = {United States},
year = {2010},
month = {5}
}

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