In-situ visualization of solute-driven phase coexistence within individual nanorods
Name
s41467-018-04021-1.pdf
Description
Published version
Size
2.77 MB
Format
Adobe PDF
Checksum (MD5)
d5ce900f07f366f3402724163c225338
Author(s)
Hayee, Fariah
Narayan, Tarun C
Nadkarni, Neel
Baldi, Andrea
Koh, Ai Leen
Bazant, Martin Z
Sinclair, Robert
Dionne, Jennifer A
Date Issued
2018
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Version
Final published version
Abstract
© 2018 The Author(s). Nanorods are promising components of energy and information storage devices that rely on solute-driven phase transformations, due to their large surface-To-volume ratio and ability to accommodate strain. Here we investigate the hydrogen-induced phase transition in individual penta-Twinned palladium nanorods of varying aspect ratios with ~3 nm spatial resolution to understand the correlation between nanorod structure and thermodynamics. We find that the hydrogenated phase preferentially nucleates at the rod tips, progressing along the length of the nanorods with increasing hydrogen pressure. While nucleation pressure is nearly constant for all lengths, the number of phase boundaries is length-dependent, with stable phase coexistence always occurring for rods longer than 55 nm. Moreover, such coexistence occurs within individual crystallites of the nanorods and is accompanied by defect formation, as supported by in situ electron microscopy and elastic energy calculations. These results highlight the effect of particle shape and dimension on thermodynamics, informing nanorod design for improved device cyclability.
MIT Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Massachusetts Institute of Technology. Department of Mathematics
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1038/S41467-018-04021-1
