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Title: Ultrafast Three-Dimensional X-ray Imaging of Deformation Modes in ZnO Nanocrystals

Journal Article · · Nano Letters

Imaging the dynamical response of materials following ultrafast excitation can reveal energy transduction mechanisms and their dissipation pathways, as well as material stability under conditions far from equilibrium. Such dynamical behaviour is challenging to characterize, especially operando at nanoscopic spatiotemporal scales. In this letter, we use x-ray coherent diffractive imaging to show that ultrafast laser excitation of a ZnO nanocrystal induces a rich set of deformation dynamics including characteristic ‘hard’ or inhomogeneous and ‘soft’ or homogeneous modes at different time scales, corresponding respectively to the propagation of acoustic phonons and resonant oscillation of the crystal. By integrating the 3D nanocrystal structure obtained from the ultrafast x-ray measurements with a continuum thermo-electro-mechanical finite element model, we elucidate the deformation mechanisms following laser excitation, in particular, a torsional mode that generates a 50% greater electric potential gradient than that resulting from the flexural mode. Furthermore, understanding of the time-dependence of these mechanisms on ultrafast scales has significant implications for development of new materials for nanoscale power generation.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1376886
Journal Information:
Nano Letters, Vol. 17, Issue 2; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (10)

Fabrication the hybrization of ZnO nanorods–Graphene nanoslices and their electrochemical properties to Levodopa in the presence of uric acid journal August 2018
Nanoscale diffractive probing of strain dynamics in ultrafast transmission electron microscopy journal January 2018
Thermo‐Phototronic‐Effect‐Enhanced Photodetectors Based on Porous ZnO Materials journal September 2019
Bragg Coherent Diffractive Imaging of Zinc Oxide Acoustic Phonons at Picosecond Timescales journal August 2017
Three-dimensional X-ray diffraction imaging of dislocations in polycrystalline metals under tensile loading journal September 2018
Accurate, rapid identification of dislocation lines in coherent diffractive imaging via a min-max optimization formulation journal January 2018
Real-time coherent diffraction inversion using deep generative networks journal November 2018
Anisotropic nano-scale resolution in 3D Bragg coherent diffraction imaging journal November 2018
Anisotropic nano-scale resolution in 3D Bragg coherent diffraction imaging text January 2018
Nanoscale diffractive probing of strain dynamics in ultrafast transmission electron microscopy text January 2017