Seung Min Jane Han
Korea Advanced Institute of Science and Technology (KAIST)
Metal-Graphene Nanolayered Composite and Career Path in the Field of Nanomechanics
Nanoscale metal-graphene nanolayered composite is known to have ultra high strength due to its ability to effectively block dislocations from penetrating through the metal-graphene interface. The same graphene interface can simultaneously serve as a barrier
interface for deflecting the fatigue cracks that are generated under cyclic bendings. Cu-graphene composite with repeat layer spacing of 100 nm indicated ~5 times enhancement in robustness against fatigue induced damage in comparison to the conventional
Cu only thin film. Fatigue induced cracks that are generated within the Cu layer were stopped by the graphene interface, which was confirmed using transmission electron microscopy images acquired ex-situ as well as during in-situ tensile test. Molecular
dynamics simulations for uniaxial tension of Cu-graphene showed limited accumulation of dislocations at the film/substrate interface, which makes the fatigue induced crack formation and propagation through thickness of the film difficult in this materials
system. Robustness against bending fatigue-induced damage makes this material well-suited for the flexible electrode application, and methods for enhancing the scalability of fabrication were also discussed. In this keynote talk at the Women’s
Breakfast, Han discussed the career path that she has taken in the field of nanomechanics and shared her experiences as a Meeting Chair for the 2021 MRS Spring Meeting.