Cobalt-assisted recrystallization and alignment of pure and doped graphene. Issue 25 (19th June 2018)

• Record Type: Journal Article
• Authors: Usachov, Dmitry Yu.; Bokai, Kirill A.; Marchenko, Dmitry E.; Fedorov, Alexander V.; Shevelev, Viktor O.; Vilkov, Oleg Yu.; Kataev, Elmar Yu.; Yashina, Lada V.; Rühl, Eckart; Laubschat, Clemens; Vyalikh, Denis V.
• Is Part Of: Nanoscale. Volume 10:Issue 25(2018)
• Page Start: 12123
• Page End: 12132
• Publication Date: 2018-06-19
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr03183e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : We convert polycrystalline graphene into monocrystalline graphene, and explore the kinetics of two-dimensional recrystallization as well as the underlying mechanism. Abstract : Recrystallization of bulk materials is a well-known phenomenon, which is widely used in commercial manufacturing. However, for low-dimensional materials like graphene, this process still remains an unresolved puzzle. Thus, the understanding of the underlying mechanisms and the required conditions for recrystallization in low dimensions is essential for the elaboration of routes towards the inexpensive and reliable production of high-quality nanomaterials. Here, we unveil the details of the efficient recrystallization of one-atom-thick pure and boron-doped polycrystalline graphene layers on a Co(0001) surface. By applying photoemission and electron diffraction, we show how more than 90% of the initially misoriented graphene grains can be reconstructed into a well-oriented and single-crystalline layer. The obtained recrystallized graphene/Co interface exhibits high structural quality with a pronounced sublattice asymmetry, which is important for achieving an unbalanced sublattice doping of graphene. By exploring the kinetics of recrystallization for native and B-doped graphene on Co, we were able to estimate the activation energy and propose a mechanism of this process.