| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties & Applications
|
| Presentation Title |
Direct Conversion of Carbon into Graphene, Diamond or Q-carbon: A New Frontier in Materials Science and Applications |
| Author(s) |
Jagdish Narayan |
| On-Site Speaker (Planned) |
Jagdish Narayan |
| Abstract Scope |
By using nanosecond pulsed laser annealing, we obtained direct conversion of carbon directly into graphene, graphene oxide (GO), reduced graphene oxide (rGO), diamond, or Q-carbon, by controlling the degree of undercooling before quenching. This nonequilibrium processing allows the formation of repeatable structures over the wafers, as each pulse converts about one-cm square, which can be repeated with 100-200Hz lasers. The rGO layers can be converted with precise spatial selectivity from p to n type by laser annealing at ambient temperatures and pressures. These rGO films also exhibit robust room-temperature ferromagnetism with a high saturation magnetization of 7.0 emu/g and 40 Oe coercivity. The rGO films exhibit >240 cm2/Vs electron mobility with n-type carrier concentration of 1.2 × 1021/cc. Recent results on rGO/amorphous carbon p-n junction devices, and BN conversion into h-BN, c-BN or Q-BN will be discussed. These findings open a definitive pathway for tuning electrical and magnetic properties in graphene-based materials with laser-writing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Electronic Materials, Surface Modification and Coatings |