Thickness-dependent elastic softening of few-layer free-standing MoSe2
Babacic, Visnja (Adam Mickiewicz University. Faculty of Physics)
Saleta Reig, David (Institut Català de Nanociència i Nanotecnologia)
Varghese, Sebin (Institut Català de Nanociència i Nanotecnologia)
Vasileiadis, Thomas (Adam Mickiewicz University. Faculty of Physics)
Coy, Emerson (Adam Mickiewicz University. NanoBioMedical Centre (Poland))
Tielrooij, Klaas-Jan (Institut Català de Nanociència i Nanotecnologia)
Graczykowski, B. (Max Planck Institute for Polymer Research)

Fecha:	2021
Resumen:	Few-layer van der Waals (vdW) materials have been extensively investigated in terms of their exceptional electronic, optoelectronic, optical, and thermal properties. Simultaneously, a complete evaluation of their mechanical properties remains an undeniable challenge due to the small lateral sizes of samples and the limitations of experimental tools. In particular, there is no systematic experimental study providing unambiguous evidence on whether the reduction of vdW thickness down to few layers results in elastic softening or stiffening with respect to the bulk. In this work, micro-Brillouin light scattering is employed to investigate the anisotropic elastic properties of single-crystal free-standing 2H-MoSe as a function of thickness, down to three molecular layers. The so-called elastic size effect, that is, significant and systematic elastic softening of the material with decreasing numbers of layers is reported. In addition, this approach allows for a complete mechanical examination of few-layer membranes, that is, their elasticity, residual stress, and thickness, which can be easily extended to other vdW materials. The presented results shed new light on the ongoing debate on the elastic size-effect and are relevant for performance and durability of implementation of vdW materials as resonators, optoelectronic, and thermoelectric devices.
Ayudas:	European Commission 804349 Agencia Estatal de Investigación PID2019-111673GB-I00 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad RYC-2017-22330
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Elastic constants ; Elastic size effect ; Few-layer MoSe2 ; Micro-Brillouin light scattering ; Van der Waals materials
Publicado en:	Advanced materials, Vol. 33, issue 23 (June 2021) , art. 2008614, ISSN 1521-4095

DOI: 10.1002/adma.202008614

8 p, 2.5 MB

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