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Title: Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution

Abstract

Atomic motion at grain boundaries is essential to microstructure development, growth and stability of catalysts and other nanostructured materials. However, boundary atomic motion is often too fast to observe in a conventional transmission electron microscope (TEM) and too slow for ultrafast electron microscopy. Here, we report on the entire transformation process of strained Pt icosahedral nanoparticles (ICNPs) into larger FCC crystals, captured at 2.5 ms time resolution using a fast electron camera. Results show slow diffusive dislocation motion at nm/s inside ICNPs and fast surface transformation at μm/s. By characterizing nanoparticle strain, we show that the fast transformation is driven by inhomogeneous surface stress. And interaction with pre-existing defects led to the slowdown of the transformation front inside the nanoparticles. Particle coalescence, assisted by oxygen-induced surface migration at T ≥ 300°C, also played a critical role. Furthermore by studying transformation in the Pt ICNPs at high time and spatial resolution, we obtain critical insights into the transformation mechanisms in strained Pt nanoparticles.

Authors:
 [1];  [2];  [1];  [3];  [4]; ORCiD logo [5];  [5];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States); Shanghai Jiao Tong Univ., Shanghai (China)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1508629
Alternate Identifier(s):
OSTI ID: 1476930
Report Number(s):
SAND-2018-10377J
Journal ID: ISSN 2045-2322; 668079
Grant/Contract Number:  
AC04-94AL85000; AC02-06CH11357
Resource 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
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Gao, Wenpei, Wu, Jianbo, Yoon, Aram, Lu, Ping, Qi, Liang, Wen, Jianguo, Miller, Dean J., Mabon, James C., Wilson, William L., Yang, Hong, and Zuo, Jian -Min. Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution. United States: N. p., 2017. Web. doi:10.1038/s41598-017-16900-6.
Gao, Wenpei, Wu, Jianbo, Yoon, Aram, Lu, Ping, Qi, Liang, Wen, Jianguo, Miller, Dean J., Mabon, James C., Wilson, William L., Yang, Hong, & Zuo, Jian -Min. Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution. United States. doi:10.1038/s41598-017-16900-6.
Gao, Wenpei, Wu, Jianbo, Yoon, Aram, Lu, Ping, Qi, Liang, Wen, Jianguo, Miller, Dean J., Mabon, James C., Wilson, William L., Yang, Hong, and Zuo, Jian -Min. Fri . "Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution". United States. doi:10.1038/s41598-017-16900-6. https://www.osti.gov/servlets/purl/1508629.
@article{osti_1508629,
title = {Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution},
author = {Gao, Wenpei and Wu, Jianbo and Yoon, Aram and Lu, Ping and Qi, Liang and Wen, Jianguo and Miller, Dean J. and Mabon, James C. and Wilson, William L. and Yang, Hong and Zuo, Jian -Min},
abstractNote = {Atomic motion at grain boundaries is essential to microstructure development, growth and stability of catalysts and other nanostructured materials. However, boundary atomic motion is often too fast to observe in a conventional transmission electron microscope (TEM) and too slow for ultrafast electron microscopy. Here, we report on the entire transformation process of strained Pt icosahedral nanoparticles (ICNPs) into larger FCC crystals, captured at 2.5 ms time resolution using a fast electron camera. Results show slow diffusive dislocation motion at nm/s inside ICNPs and fast surface transformation at μm/s. By characterizing nanoparticle strain, we show that the fast transformation is driven by inhomogeneous surface stress. And interaction with pre-existing defects led to the slowdown of the transformation front inside the nanoparticles. Particle coalescence, assisted by oxygen-induced surface migration at T ≥ 300°C, also played a critical role. Furthermore by studying transformation in the Pt ICNPs at high time and spatial resolution, we obtain critical insights into the transformation mechanisms in strained Pt nanoparticles.},
doi = {10.1038/s41598-017-16900-6},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {12}
}

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