| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Delamination Mechanisms in 2D Transition-Metal Dichalcogenides by In-situ Nanoscratch Visualization |
| Author(s) |
Arvind Agarwal |
| On-Site Speaker (Planned) |
Arvind Agarwal |
| Abstract Scope |
There is a gap between studies investigating few-layer tribological characteristics of 2-dimensional layered materials by ultra-low load atomic force microscopy (AFM) and their functional applications utilizing tens of layers. This study establishes a bridge connecting single-layer phenomena to multi-layered scratch responses in 2D transition-metal dichalcogenides by integrated AFM and in-situ nanoscratch visualization. At the intra-layer level, wrinkles and covalent bonding generate a sinusoidal trend in the lateral resistance forces. At tens of layers, these translate into 3 distinct regimes, dictated by gliding and multi-layer fracture in the material. Each regime constitutes a characteristic orientation relationship between the lateral force and the failure process, either parallel or perpendicular. Modeling combined with in-situ imaging shows that the lateral force can be analyzed using a linear-sine framework which predicts an increasing amplitude of fracture with an increasing number of layers that saturates as the delamination approaches bulk volumes. |
| Proceedings Inclusion? |
Planned: |