| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties & Applications
|
| Presentation Title |
Pressure-induced Formation and Mechanical Properties of 2D Diamond Boron Nitride |
| Author(s) |
Elisa Riedo |
| On-Site Speaker (Planned) |
Elisa Riedo |
| Abstract Scope |
Experiments and simulations are used to investigate the mechanical properties of a 2D diamond BN phase induced by applying local pressure on atomically thin h-BN on a SiO2 substrate, at room temperature, and without chemical functionalization. Simulations show a metastable local rearrangement of the h-BN atoms into diamond crystal clusters when increasing the indentation pressure. Raman spectroscopy confirms the presence of a pressure-induced cubic BN phase, and its metastability upon release of pressure. Å-indentation experiments and simulations show that at pressures of 2 - 4 GPa, the indentation stiffness of 2- and 3-layer-thick h-BN on SiO2 increases of up to 50% compared to bare SiO2, and then it decreases when increasing the number of layers. Up to 4 GPa, the reduced strain in the layers closer to the substrate decreases the probability of the sp2-to-sp3 phase transition, explaining the lower stiffness observed in thicker h-BN. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Thin Films and Interfaces, Nanotechnology |