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Heterogeneous deformation of two-dimensional materials for emerging functionalities

Published online by Cambridge University Press:  24 February 2020

Jin Myung Kim ,
Chullhee Cho ,
Ezekiel Y. Hsieh  and
SungWoo Nam Open the ORCID record for SungWoo Nam [Opens in a new window]
Jin Myung Kim*
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Chullhee Cho
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Ezekiel Y. Hsieh
Affiliation:
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
SungWoo Nam*
Affiliation:
Department of Materials Science and Engineering, Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
*
a)Address all correspondence to these authors. e-mail: jk25@illinois.edu
b)e-mail: swnam@illinois.edu
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Abstract

Atomically thin 2D materials exhibit strong intralayer covalent bonding and weak interlayer van der Waals interactions, offering unique high in-plane strength and out-of-plane flexibility. While atom-thick nature of 2D materials may cause uncontrolled intrinsic/extrinsic deformation in multiple length scales, it also provides new opportunities for exploring coupling between heterogeneous deformations and emerging functionalities in controllable and scalable ways for electronic, optical, and optoelectronic applications. In this review, we discuss (i) the mechanical characteristics of 2D materials, (ii) uncontrolled inherent deformation and extrinsic heterogeneity present in 2D materials, (iii) experimental strategies for controlled heterogeneous deformation of 2D materials, (iv) 3D structure-induced novel functionalities via crumple/wrinkle structure or kirigami structures, and (v) heterogeneous strain-induced emerging functionalities in exciton and phase engineering. Overall, heterogeneous deformation offers unique advantages for 2D materials research by enabling spatial tunability of 2D materials' interactions with photons, electrons, and molecules in a programmable and controlled manner.

Keywords

elastic propertieselectrical propertiesoptical properties
Type
Invited Review
Information
Journal of Materials Research , Volume 35 , Issue 11: Focus Section: Heterogeneity in Beyond Graphene 2D Materials , 15 June 2020 , pp. 1369 - 1385
Copyright
Copyright © Materials Research Society 2020

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Footnotes

c)

These authors contributed equally to this work.

This section of Journal of Materials Research is reserved for papers that are reviews of literature in a given area.

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