| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
H-32: Ionization Induced Changes in Carbon Bonding of Graphite |
| Author(s) |
John Derek Demaree, Lenore S. Miller, Zhiping Luo , Daryush Ila |
| On-Site Speaker (Planned) |
John Derek Demaree |
| Abstract Scope |
Highly oriented pyrolytic graphite (HOPG) provides an ideal platform to study the breaking and reordering of surface bonds in graphene. We studied ionization-induced changes in the bonding of HOPG from sp2 (graphitic) to sp3 (amorphous or diamondlike) using MeV ion beams with varying degrees of ionization in order to better understand phase changes in ionizing environments, as well as possibly provide a path to precise functionalization of these materials. Coupons of HOPG were bombarded with H, He, C, Si, Ag, and Au ions at energies designed to produce ionization densities from 6 to 340 eV/Å. Surfaces were examined using x-ray photoelectron spectroscopy (XPS), x-ray induced C KLL Auger spectroscopy, Raman spectroscopy, and 3D laser microscopy. The transformation of graphitic sp2 bonding to amorphous or diamondlike sp3 bonding was generally dependent on the ionization density, indicating that this transformation may be explained by ion-induced excitation and rapid thermal quenching. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |