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Title: Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles

Abstract

Sintering and sublimation process of nanoparticles made of Ag, Au, and interfaced Ag/Au heterodimers has been investigated by in-situ transmission electron microscopy at room temperature. Such process is driven by the illumination of high-energy electron beam accelerated at 200kV that promotes atom diffusion in the physically contacted nanoparticles. Upon electron illumination, adjacent Au nanoparticles gradually merge together to form a larger particle along with the reduction of surface area despite that orientated attachment is not observed. The nanoparticle fusion process is significantly different from the well-established thermal diffusion mechanism. In addition to the similar fusion process, Ag nanoparticles undergo apparent sublimation because the transferred energy from electron beam to nanoparticles is higher than the surface binding energy of Ag atoms when the electron scattering angle is larger than 112°. The electron beam illumination can transform the interfaced Au/Ag dimers to Au@Ag core-shell particles followed by a slow sublimation of the Ag shells. Both diffusion and sublimation of Ag atoms are dependent on the intensity of electron beam, i.e., higher beam intensity is favorable to accelerate both process.

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1391958
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nanoscale; Journal Volume: 7; Journal Issue: 32
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; In-situ transmission electron microscopy; atomic diffusion; metal nanoparticles; sintering; sublimation

Citation Formats

Liu, Yuzi, and Sun, Yugang. Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles. United States: N. p., 2015. Web. doi:10.1039/c5nr03523f.
Liu, Yuzi, & Sun, Yugang. Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles. United States. doi:10.1039/c5nr03523f.
Liu, Yuzi, and Sun, Yugang. Thu . "Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles". United States. doi:10.1039/c5nr03523f.
@article{osti_1391958,
title = {Electron beam induced evolution in Au, Ag, and interfaced heterogeneous Au/Ag nanoparticles},
author = {Liu, Yuzi and Sun, Yugang},
abstractNote = {Sintering and sublimation process of nanoparticles made of Ag, Au, and interfaced Ag/Au heterodimers has been investigated by in-situ transmission electron microscopy at room temperature. Such process is driven by the illumination of high-energy electron beam accelerated at 200kV that promotes atom diffusion in the physically contacted nanoparticles. Upon electron illumination, adjacent Au nanoparticles gradually merge together to form a larger particle along with the reduction of surface area despite that orientated attachment is not observed. The nanoparticle fusion process is significantly different from the well-established thermal diffusion mechanism. In addition to the similar fusion process, Ag nanoparticles undergo apparent sublimation because the transferred energy from electron beam to nanoparticles is higher than the surface binding energy of Ag atoms when the electron scattering angle is larger than 112°. The electron beam illumination can transform the interfaced Au/Ag dimers to Au@Ag core-shell particles followed by a slow sublimation of the Ag shells. Both diffusion and sublimation of Ag atoms are dependent on the intensity of electron beam, i.e., higher beam intensity is favorable to accelerate both process.},
doi = {10.1039/c5nr03523f},
journal = {Nanoscale},
number = 32,
volume = 7,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 2015},
month = {Thu Jan 01 00:00:00 EST 2015}
}