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Issue 3, 2020
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Effect of lattice mismatch and shell thickness on strain in core@shell nanocrystals

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Abstract

Bimetallic nanocrystals with a core@shell architecture are versatile, multifunctional particles. The lattice mismatch between core and shell regions induces strain, affecting the electronic properties of the shell metal, which is important for applications in catalysis. Here, we analyze this strain in core@shell nanocubes as a function of lattice mismatch and shell thickness. Coupling geometric phase analysis from atomic resolution scanning transmission electron microscopy images with molecular dynamics simulations reveals lattice relaxation in the shell within only a few monolayers and an overexpansion in the axial direction. Interestingly, many works report core@shell metal nanocatalysts with optimum performance at greater shell thicknesses. Our findings suggest that not strain alone but secondary factors, such as structural defects or structural changes in operando, may account for observed enhancements in some strain-engineered nanocatalysts; e.g., Rh@Pt nanocubes for formic acid electrooxidation.

Graphical abstract: Effect of lattice mismatch and shell thickness on strain in core@shell nanocrystals

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Supplementary files

Article information


Submitted
22 Jan 2020
Accepted
20 Feb 2020
First published
02 Mar 2020

This article is Open Access

Nanoscale Adv., 2020,2, 1105-1114
Article type
Paper

Effect of lattice mismatch and shell thickness on strain in core@shell nanocrystals

J. T. L. Gamler, A. Leonardi, X. Sang, K. M. Koczkur, R. R. Unocic, M. Engel and S. E. Skrabalak, Nanoscale Adv., 2020, 2, 1105
DOI: 10.1039/D0NA00061B

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