Actions for Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution [electronic resource].

Email RIS file
Bookmark
Report an Issue

Dynamics of Transformation from Platinum Icosahedral Nanoparticles to Larger FCC Crystal at Millisecond Time Resolution [electronic resource].

Published
Washington, D.C. : United States. National Nuclear Security Administration, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers: 17,243 : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. National Nuclear Security Administration, United States. Department of Energy. Office of Basic Energy Sciences, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
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.
Report Numbers
E 1.99:sand2017--0852j
sand2017--0852j
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/08/2017.
"sand2017--0852j"
"650749"
Scientific Reports 7 1 ISSN 2045-2322 FT
Wenpei Gao; Jianbo Wu; Aram Yoon; Ping Lu; Liang Qi; Jianguo Wen; Dean J. Miller; James C. Mabon; William L. Wilson; Hong Yang; Jian-Min Zuo.
Univ. of Illinois at Urbana-Champaign, IL (United States)
Hitachi, Ltd., Tokyo (Japan)
Gatan Inc., Pleasanton, CA (United States)
Funding Information
AC04-94AL85000
DMR-1410596
FG02-01ER45923
CHE-1213926
MRI-1229454
AC02-06CH11357
View MARC record | catkey: 24044527