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Light-Induced Anisotropic Morphological Dynamics of Black Phosphorus Membranes Visualized by Dark-Field Ultrafast Electron Microscopy

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Title
Light-Induced Anisotropic Morphological Dynamics of Black Phosphorus Membranes Visualized by Dark-Field Ultrafast Electron Microscopy
Author(s)
Yejin Kim; Yangjin Lee; Kwanpyo Kim; Oh-Hoon Kwon
Subject
anisotropy, ; black phosphorus (BP), ; nanoelectromechanical systems (NEMS), ; spatiotemporal imaging, ; structural dynamics, ; ultrafast electron microscopy (UEM)
Publication Date
2020-09
Journal
ACS NANO, v.14, no.9, pp.11383 - 11393
Publisher
AMER CHEMICAL SOC
Abstract
© 2020 American Chemical Society. Black phosphorus (BP) is an elemental layered material with a strong in-plane anisotropic structure. This structure is accompanied by anisotropic optical, electrical, thermal, and mechanical properties. Despite interest in BP from both fundamental and technical aspects, investigation into the structural dynamics of BP caused by strain fields, which are prevalent for two-dimensional (2D) materials and tune the material physical properties, has been overlooked. Here, we report the morphological dynamics of photoexcited BP membranes observed using time-resolved diffractograms and dark-field images obtained via ultrafast electron microscopy. Aided by 4D reconstruction, we visualize the nonequilibrium bulging of thin BP membranes and reveal that the buckling transition is driven by impulsive thermal stress upon photoexcitation in real time. The bulging, buckling, and flattening (on strain release) showed anisotropic spatiotemporal behavior. Our observations offer insights into the fleeting morphology of anisotropic 2D matter and provide a glimpse into the mapping of transient, modulated physical properties upon impulsive excitation, as well as strain engineering at the nanoscale
URI
https://pr.ibs.re.kr/handle/8788114/8481
DOI
10.1021/acsnano.0c03644
ISSN
1936-0851
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > 1. Journal Papers (저널논문)
Center for Nanomedicine (나노의학 연구단) > 1. Journal Papers (저널논문)
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