Confined Crack Propagation in MoS₂Monolayers by Creating Atomic Vacancies

Yolanda Manzanares-Negro; Guillermo López-Polín; Kazunori Fujisawa; Tianyi Zhang; Fu Zhang; Ethan Kahn; Néstor Perea-López; Mauricio Terrones; Julio Gómez-Herrero; Cristina Gómez-Navarro

doi:10.1021/acsnano.0c08235

journal article·2021-01-26

Confined Crack Propagation in MoS₂Monolayers by Creating Atomic Vacancies

Yolanda Manzanares-Negro, Guillermo López-Polín, Kazunori Fujisawa, Tianyi Zhang, Fu Zhang, Ethan Kahn, Néstor Perea-López, Mauricio Terrones, Julio Gómez-Herrero, Cristina Gómez-Navarro

ACS Nano· Volume 15· Issue 1

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Source abstract

Abstract

In two-dimensional crystals, fractures propagate easily, thus restricting their mechanical reliability. This work demonstrates that controlled defect creation constitutes an effective approach to avoid catastrophic failure in MoS2 monolayers. A systematic study of fracture mechanics in MoS2 monolayers as a function of the density of atomic vacancies, created by ion irradiation, is reported. Pristine and irradiated materials were studied by atomic force microscopy, high-resolution scanning transmission electron microscopy, and Raman spectroscopy. By inducing ruptures through nanoindentations, we determine the strength and length of the propagated cracks within MoS2 atom-thick membranes as a function of the density and type of the atomic vacancies. We find that a 0.15% atomic vacancy induces a decrease of 40% in strength with respect to that of pristine samples. In contrast, while tear holes in pristine 2D membranes span several microns, they are restricted to a few nanometers in the presence of atomic and nanometer-sized vacancies, thus increasing the material’s fracture toughness.

Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Madrid E-28049, Spain

ICMM, CSIC, Madrid E-28049, Spain

Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States

Center for 2-Dimensional and Layered Materials, The Pennsylvania State University, University Park, Pennsylvania 16802, United States

Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano-city 380-8553, Japan

Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States

Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States

IFIMAC Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid E-28049, Spain

Funding

Fundaci?n Ram?n Areces · H2020 Future and Emerging Technologies · Agencia Estatal de Investigaci?n

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