Anisotropic Fracture of Two-Dimensional Ta<sub>2</sub>NiSe<sub>5</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38687224.
- Also identified by DOI 10.1021/acs.nanolett.4c01202.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Anisotropic two-dimensional materials present a diverse range of physical characteristics, making them well-suited for applications in photonics and optoelectronics. While mechanical properties play a crucial role in determining the reliability and efficacy of 2D material-based devices, the fracture behavior of anisotropic 2D crystals remains relatively unexplored. Toward this end, we herein present the first measurement of the anisotropic fracture toughness of 2D Ta<sub>2</sub>NiSe<sub>5</sub> by microelectromechanical system-based tensile tests. Our findings reveal a significant in-plane anisotropic ratio (∼3.0), accounting for crystal orientation-dependent crack paths. As the thickness increases, we observe an intriguing intraplanar-to-interplanar transition of fracture along the <i>a</i>-axis, manifesting as stepwise crack features attributed to interlayer slippage. In contrast, ruptures along the <i>c</i>-axis surprisingly exhibit persistent straightness and smoothness regardless of thickness, owing to the robust interlayer shear resistance. Our work affords a promising avenue for the construction of future electronics based on nanoribbons with atomically sharp edges.