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Title: Strain Relaxation-Induced Twin Interface Migration and Morphology Evolution of Silver Nanoparticles

Abstract

The twinned structure of nanoscale metal particles is considered to be an important factor in the formation of novel morphologies. Nevertheless, most studies are focused on the growth of nanoparticles with stable twinned structures, and little is known about the intrinsic relationship between the morphological evolution and the strain relaxation induced by twin boundary migration. In this study, we elucidated the mechanisms of symmetry breaking induced by strain relaxation in Ag nanoparticles by employing transmission electron microscopy, electron tomography, and strain analysis. The experimental results reveal that decahedral nanoparticles larger than ~ 50 nm evolve into asym-metrical rhomboid pyramids to relax the lattice strain energy in the fivefold twin through twin pole migration. This migration is achieved by coordinating slipping and dissociating of partial and perfect dislocations. In addition, we found that the rhomboid pyramid further evolves into a rhomboid bar during growth in a specific way to avoid in-creasing the strain energy in the crystal.

Authors:
 [1];  [1];  [2]; ORCiD logo [1]
  1. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
  2. Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1507528
Report Number(s):
PNNL-SA-138287
Journal ID: ISSN 0897-4756
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 31; Journal Issue: 3; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English

Citation Formats

Song, Miao, Wu, Zhigang, Lu, Ning, and Li, Dongsheng. Strain Relaxation-Induced Twin Interface Migration and Morphology Evolution of Silver Nanoparticles. United States: N. p., 2019. Web. doi:10.1021/acs.chemmater.8b03984.
Song, Miao, Wu, Zhigang, Lu, Ning, & Li, Dongsheng. Strain Relaxation-Induced Twin Interface Migration and Morphology Evolution of Silver Nanoparticles. United States. doi:10.1021/acs.chemmater.8b03984.
Song, Miao, Wu, Zhigang, Lu, Ning, and Li, Dongsheng. Tue . "Strain Relaxation-Induced Twin Interface Migration and Morphology Evolution of Silver Nanoparticles". United States. doi:10.1021/acs.chemmater.8b03984.
@article{osti_1507528,
title = {Strain Relaxation-Induced Twin Interface Migration and Morphology Evolution of Silver Nanoparticles},
author = {Song, Miao and Wu, Zhigang and Lu, Ning and Li, Dongsheng},
abstractNote = {The twinned structure of nanoscale metal particles is considered to be an important factor in the formation of novel morphologies. Nevertheless, most studies are focused on the growth of nanoparticles with stable twinned structures, and little is known about the intrinsic relationship between the morphological evolution and the strain relaxation induced by twin boundary migration. In this study, we elucidated the mechanisms of symmetry breaking induced by strain relaxation in Ag nanoparticles by employing transmission electron microscopy, electron tomography, and strain analysis. The experimental results reveal that decahedral nanoparticles larger than ~ 50 nm evolve into asym-metrical rhomboid pyramids to relax the lattice strain energy in the fivefold twin through twin pole migration. This migration is achieved by coordinating slipping and dissociating of partial and perfect dislocations. In addition, we found that the rhomboid pyramid further evolves into a rhomboid bar during growth in a specific way to avoid in-creasing the strain energy in the crystal.},
doi = {10.1021/acs.chemmater.8b03984},
journal = {Chemistry of Materials},
issn = {0897-4756},
number = 3,
volume = 31,
place = {United States},
year = {2019},
month = {1}
}