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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. 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. Thus 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];  [6];  [1]; ORCiD logo [7]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering and Fredrick Seitz Materials Research Lab.
  2. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering, Fredrick Seitz Materials Research Lab. and Dept. of Chemical and Biomolecular Engineering; Shanghai Jiao Tong Univ. (China). School of Materials Science and Engineering
  3. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials and Electron Microscopy Center
  6. Univ. of Illinois at Urbana-Champaign, IL (United States). Fredrick Seitz Materials Research Lab.
  7. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Chemical and Biomolecular Engineering
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); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Univ. of Illinois at Urbana-Champaign, IL (United States); Hitachi, Ltd., Tokyo (Japan); Gatan Inc., Pleasanton, CA (United States)
OSTI Identifier:
1429625
Report Number(s):
SAND2017-0852J
Journal ID: ISSN 2045-2322; 650749
DOE Contract Number:
AC04-94AL85000; DMR-1410596; FG02-01ER45923; CHE-1213926; MRI-1229454; AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scientific Reports; Journal Volume: 7; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; imaging techniques; nanoparticles; transformation; catalyst degradation; environmental transmission electron microscopy; abnormal grain growth

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/1429625.
@article{osti_1429625,
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. 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. Thus 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 = {Fri Dec 08 00:00:00 EST 2017},
month = {Fri Dec 08 00:00:00 EST 2017}
}