Tunable Mechanical Response of Self-Assembled Nanoparticle Superlattices
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Nano_Letters__NCT.pdf
Description
Accepted version
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30.31 MB
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Author(s)
Dhulipala, Somayajulu
Yee, Daryl W.
Zhou, Ziran
Sun, Rachel
Andrade, José E.
Macfarlane, Robert J.
Portela, Carlos M.
Date Issued
May 22, 2023
Journal
Nano Letters
Publisher
American Chemical Society
Citation
Dhulipala, Somayajulu, Yee, Daryl W., Zhou, Ziran, Sun, Rachel, Andrade, José E. et al. 2023. "Tunable Mechanical Response of Self-Assembled Nanoparticle Superlattices." Nano Letters, 23 (11).
Version
Author's final manuscript
Abstract
Self-assembled nanoparticle superlattices (NPSLs) are an emergent class of self-architected nanocomposite materials that possess promising properties arising from precise nanoparticle ordering. Their multiple coupled properties make them desirable as functional components in devices where mechanical robustness is critical. However, questions remain about NPSL mechanical properties and how shaping them affects their mechanical response. Here, we perform in situ nanomechanical experiments that evidence up to an 11-fold increase in stiffness (∼1.49 to 16.9 GPa) and a 5-fold increase in strength (∼88 to 426 MPa) because of surface stiffening/strengthening from shaping these nanomaterials via focused-ion-beam milling. To predict the mechanical properties of shaped NPSLs, we present discrete element method (DEM) simulations and an analytical core-shell model that capture the FIB-induced stiffening response. This work presents a route for tunable mechanical responses of self-architected NPSLs and provides two frameworks to predict their mechanical response and guide the design of future NPSL-containing devices.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-Noncommercial-ShareAlike
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DOI of Published Version
https://doi.org/10.1021/acs.nanolett.3c01058
