Visualization of nanocrystal breathing modes at extreme strains.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Szilagyi E,Wittenberg JS,Miller TA,Lutker K,Quirin F,Lemke H,Zhu D,Chollet M,Robinson J,Wen H,Sokolowski-Tinten K,Lindenberg AM

doi

10.1038/ncomms7577

subject

Has Abstract

pub_date

2015-03-12 00:00:00

pages

6577

issn

2041-1723

pii

ncomms7577

journal_volume

6

pub_type

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