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Title: Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles

Abstract

The size, size distribution and stability of colloidal nanoparticles are greatly affected by the presence of capping ligands. Despite the key contribution of capping ligands during the synthesis reaction, their role in regulating the nucleation and growth rates of colloidal nanoparticles is not well understood. In this work, we demonstrate a mechanistic investigation of the role of trioctylphosphine (TOP) in Pd nanoparticles in different solvents (toluene and pyridine) using in situ SAXS and ligand-based kinetic modeling. Our results under different synthetic conditions reveal the overlap of nucleation and growth of Pd nanoparticles during the reaction, which contradicts the LaMer-type nucleation and growth model. The model accounts for the kinetics of Pd-TOP binding for both, the precursor and the particle surface, which is essential to capture the size evolution as well as the concentration of particles in situ. In addition, we illustrate the predictive power of our ligand-based model through designing the synthetic conditions to obtain nanoparticles with desired sizes. The proposed methodology can be applied to other synthesis systems and therefore serves as an effective strategy for predictive synthesis of colloidal nanoparticles.

Authors:
 [1];  [1];  [2];  [3];  [4];  [4];  [5];  [6]
  1. Virginia Polytechnic Institute
  2. UNIVERSITY OF WISCONSIN
  3. Los Alamos National Laboratory
  4. Argonne National Laboratory
  5. BATTELLE (PACIFIC NW LAB)
  6. Virginia Tech
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1578067
Report Number(s):
PNNL-SA-140505
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Journal of Visual Experiments
Additional Journal Information:
Journal Volume: 136
Country of Publication:
United States
Language:
English

Citation Formats

Mozaffari, Saeed, Li, Wenhui, Thompson, Coogan B., Ivanov, Sergei, Seifert, Soenke, Lee, Byeongdu, Kovarik, Libor, and Karim, Ayman M. Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles. United States: N. p., 2018. Web. doi:10.3791/57667.
Mozaffari, Saeed, Li, Wenhui, Thompson, Coogan B., Ivanov, Sergei, Seifert, Soenke, Lee, Byeongdu, Kovarik, Libor, & Karim, Ayman M. Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles. United States. https://doi.org/10.3791/57667
Mozaffari, Saeed, Li, Wenhui, Thompson, Coogan B., Ivanov, Sergei, Seifert, Soenke, Lee, Byeongdu, Kovarik, Libor, and Karim, Ayman M. 2018. "Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles". United States. https://doi.org/10.3791/57667.
@article{osti_1578067,
title = {Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles},
author = {Mozaffari, Saeed and Li, Wenhui and Thompson, Coogan B. and Ivanov, Sergei and Seifert, Soenke and Lee, Byeongdu and Kovarik, Libor and Karim, Ayman M.},
abstractNote = {The size, size distribution and stability of colloidal nanoparticles are greatly affected by the presence of capping ligands. Despite the key contribution of capping ligands during the synthesis reaction, their role in regulating the nucleation and growth rates of colloidal nanoparticles is not well understood. In this work, we demonstrate a mechanistic investigation of the role of trioctylphosphine (TOP) in Pd nanoparticles in different solvents (toluene and pyridine) using in situ SAXS and ligand-based kinetic modeling. Our results under different synthetic conditions reveal the overlap of nucleation and growth of Pd nanoparticles during the reaction, which contradicts the LaMer-type nucleation and growth model. The model accounts for the kinetics of Pd-TOP binding for both, the precursor and the particle surface, which is essential to capture the size evolution as well as the concentration of particles in situ. In addition, we illustrate the predictive power of our ligand-based model through designing the synthetic conditions to obtain nanoparticles with desired sizes. The proposed methodology can be applied to other synthesis systems and therefore serves as an effective strategy for predictive synthesis of colloidal nanoparticles.},
doi = {10.3791/57667},
url = {https://www.osti.gov/biblio/1578067}, journal = {Journal of Visual Experiments},
number = ,
volume = 136,
place = {United States},
year = {2018},
month = {6}
}