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Journal of Materials Science

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27-01-2021 | Metals & Corrosion

Electron irradiation effects on Ag nanoparticles

Authors: Bárbara Konrad, Zacarias E. Fabrim, Mariana M. Timm, Paulo F. P. Fichtner

Published in: Journal of Materials Science | Issue 13/2021

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Abstract

In situ electron irradiation effects on shape and size of plate-like Ag nanoparticles (NPs) embedded in silicon nitride self-standing \(\approx\) 70-nm-thick membranes are investigated as a function of the beam energy (120, 160 and 200 keV) and fluence using a conventional transmission electron microscope. The irradiations are performed at room temperature and cause a rapid spheroidization of the initially observed plate-like structures. Preferential sputtering of N and Si atoms exposes the resulting Ag NPs to the vacuum. At this point the sputtering of the Ag atoms causes a size decrease at distinct rates depending on the NP size and on the beam energy. This is modeled considering the influence of a size-dependent surface binding of the Ag atoms on the sputtering process. The results are compared with literature models for size-dependent cohesive energy. Our experiments discloses a new way to modify sizes and shapes and test for the size-dependent properties of thermally unstable nanoscopic objects.

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Title: Electron irradiation effects on Ag nanoparticles
Authors: Bárbara Konrad
Zacarias E. Fabrim
Mariana M. Timm
Paulo F. P. Fichtner
Publication date: 27-01-2021
Publisher: Springer US
Published in: Journal of Materials Science / Issue 13/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-020-05705-0

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