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Title: Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM

In situ microscopy of colloidal nanocrystal growth offers a unique opportunity to acquire direct and straightforward data for assessing classical growth models. For this study, we observe the growth trajectories of individual Ag nanoparticles in solution using in situ scanning transmission electron microscopy. For the first time, we provide experimental evidence of growth rates of Ag nanoparticles in the presence of Pt in solution that are significantly faster than predicted by Lifshitz-Slyozov-Wagner theory. We attribute these observed anomalous growth rates to the synergistic effects of the catalytic properties of Pt and the electron beam itself. Transiently reduced Pt atoms serve as active sites for Ag ions to grow, thereby playing a key role in controlling the growth kinetics. Electron beam illumination greatly increases the local concentration of free radicals, thereby strongly influencing particle growth rate and the resulting particle morphology. Through a systematic investigation, we demonstrate the feasibility of utilizing these synergistic effects for controlling the growth rates and particle morphologies at the nanoscale. Our findings not only expand the current scope of crystal growth theory, but may also lead to a broader scientific application of nanocrystal synthesis.
Authors:
 [1] ;  [2] ;  [1] ; ORCiD logo [2]
  1. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Publication Date:
Report Number(s):
BNL-203444-2018-JAAM
Journal ID: ISSN 2045-2322
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; 43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; nanoparticles; transmission electron microscopy
OSTI Identifier:
1431446

Ge, Mingyuan, Lu, Ming, Chu, Yong, and Xin, Huolin. Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM. United States: N. p., Web. doi:10.1038/s41598-017-15140-y.
Ge, Mingyuan, Lu, Ming, Chu, Yong, & Xin, Huolin. Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM. United States. doi:10.1038/s41598-017-15140-y.
Ge, Mingyuan, Lu, Ming, Chu, Yong, and Xin, Huolin. 2017. "Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM". United States. doi:10.1038/s41598-017-15140-y. https://www.osti.gov/servlets/purl/1431446.
@article{osti_1431446,
title = {Anomalous Growth Rate of Ag Nanocrystals Revealed by in situ STEM},
author = {Ge, Mingyuan and Lu, Ming and Chu, Yong and Xin, Huolin},
abstractNote = {In situ microscopy of colloidal nanocrystal growth offers a unique opportunity to acquire direct and straightforward data for assessing classical growth models. For this study, we observe the growth trajectories of individual Ag nanoparticles in solution using in situ scanning transmission electron microscopy. For the first time, we provide experimental evidence of growth rates of Ag nanoparticles in the presence of Pt in solution that are significantly faster than predicted by Lifshitz-Slyozov-Wagner theory. We attribute these observed anomalous growth rates to the synergistic effects of the catalytic properties of Pt and the electron beam itself. Transiently reduced Pt atoms serve as active sites for Ag ions to grow, thereby playing a key role in controlling the growth kinetics. Electron beam illumination greatly increases the local concentration of free radicals, thereby strongly influencing particle growth rate and the resulting particle morphology. Through a systematic investigation, we demonstrate the feasibility of utilizing these synergistic effects for controlling the growth rates and particle morphologies at the nanoscale. Our findings not only expand the current scope of crystal growth theory, but may also lead to a broader scientific application of nanocrystal synthesis.},
doi = {10.1038/s41598-017-15140-y},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {11}
}

Works referenced in this record:

Shape-Controlled Synthesis of Gold and Silver Nanoparticles
journal, December 2002