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

Journal Article · · Nano Research
 [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

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Temperature Materials Laboratory (HTML)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1364252
Journal Information:
Nano Research, Journal Name: Nano Research Journal Issue: 3 Vol. 3; ISSN 1998-0124
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Bimetallic Nanocrystals: Liquid-Phase Synthesis and Catalytic Applications journal January 2011
Metal Nanocrystals with Highly Branched Morphologies journal November 2010
Noble-Metal Nanocrystals with Concave Surfaces: Synthesis and Applications journal May 2012
Shape-Controlled Nanostructures in Heterogeneous Catalysis journal September 2013
Droplet-Based Microreactors for Continuous Production of Palladium Nanocrystals with Controlled Sizes and Shapes journal April 2013
Synthesis of Pd nanocrystals enclosed by {100} facets and with sizes <10 nm for application in CO oxidation journal October 2010
Shape-dependent electrocatalysis: formic acid electrooxidation on cubic Pd nanoparticles journal January 2012
Palladium nanocrystals enclosed by {100} and {111} facets in controlled proportions and their catalytic activities for formic acid oxidation journal January 2012
Escape from the destruction of the galvanic replacement reaction for solid → hollow → solid conversion process in one pot reaction journal January 2013
Reliable palladium nanoparticle syntheses in aqueous solution: the importance of understanding precursor chemistry and growth mechanism journal January 2015
High impact of the reducing agent on palladium nanomaterials: new insights from X-ray photoelectron spectroscopy and oxygen reduction reaction journal January 2016
What dictates which ion, I or Br , mediates the growth of cubic Pd nanocrystals? journal January 2018
Anisotropic nanomaterials for shape-dependent physicochemical and biomedical applications journal January 2019
On the role of surface diffusion in determining the shape or morphology of noble-metal nanocrystals journal April 2013
Surface Structure Characterization of Shape and Size Controlled Pd Nanoparticles by Cu UPD: A Quantitative Approach journal July 2019
Intracellular Antioxidant Activity of Biocompatible Citrate-Capped Palladium Nanozymes journal January 2020
Facile Synthesis of Pd Nanocubes with Assistant of Iodide and Investigation of Their Electrocatalytic Performances Towards Formic Acid Oxidation journal March 2019