Visualization of nanocrystal breathing modes at extreme strains

Nature Communications
Erzsi SzilagyiAaron M Lindenberg

Abstract

Nanoscale dimensions in materials lead to unique electronic and structural properties with applications ranging from site-specific drug delivery to anodes for lithium-ion batteries. These functional properties often involve large-amplitude strains and structural modifications, and thus require an understanding of the dynamics of these processes. Here we use femtosecond X-ray scattering techniques to visualize, in real time and with atomic-scale resolution, light-induced anisotropic strains in nanocrystal spheres and rods. Strains at the percent level are observed in CdS and CdSe samples, associated with a rapid expansion followed by contraction along the nanosphere or nanorod radial direction driven by a transient carrier-induced stress. These morphological changes occur simultaneously with the first steps in the melting transition on hundreds of femtosecond timescales. This work represents the first direct real-time probe of the dynamics of these large-amplitude strains and shape changes in few-nanometre-scale particles.

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Citations

Jan 28, 2018·Nature Communications·A H ReidH A Dürr
Mar 17, 2018·Physical Review Letters·Hirofumi AkamatsuVenkatraman Gopalan
Feb 1, 2019·Nature Communications·Matthew S KirschnerRichard D Schaller
May 22, 2019·Annual Review of Physical Chemistry·Benjamin T DirollRichard D Schaller
Sep 19, 2018·ACS Nano·Matthew S KirschnerRichard D Schaller
Mar 9, 2018·The Journal of Physical Chemistry Letters·Nuri YazdaniVanessa Wood
Jul 28, 2018·ACS Nano·Alessio De FrancescoAlessandro Cunsolo
May 22, 2018·Nano Letters·Kyle J Schnitzenbaumer, Gordana Dukovic

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